Rollup merge of #103908 - estebank:consider-cloning, r=compiler-errors

Suggest `.clone()` or `ref binding` on E0382

compiler/rustc_ast/src/ast.rs

@@ -1376,7 +1376,7 @@ pub enum ExprKind {
     /// Conditionless loop (can be exited with `break`, `continue`, or `return`).
     ///
     /// `'label: loop { block }`
-    Loop(P<Block>, Option<Label>),
+    Loop(P<Block>, Option<Label>, Span),
     /// A `match` block.
     Match(P<Expr>, Vec<Arm>),
     /// A closure (e.g., `move |a, b, c| a + b + c`).

compiler/rustc_ast/src/mut_visit.rs

@@ -1355,9 +1355,10 @@ pub fn noop_visit_expr<T: MutVisitor>(
             vis.visit_block(body);
             visit_opt(label, |label| vis.visit_label(label));
         }
-        ExprKind::Loop(body, label) => {
+        ExprKind::Loop(body, label, span) => {
             vis.visit_block(body);
             visit_opt(label, |label| vis.visit_label(label));
+            vis.visit_span(span);
         }
         ExprKind::Match(expr, arms) => {
             vis.visit_expr(expr);

compiler/rustc_ast/src/visit.rs

@@ -824,7 +824,7 @@ pub fn walk_expr<'a, V: Visitor<'a>>(visitor: &mut V, expression: &'a Expr) {
             visitor.visit_expr(subexpression);
             visitor.visit_block(block);
         }
-        ExprKind::Loop(block, opt_label) => {
+        ExprKind::Loop(block, opt_label, _) => {
             walk_list!(visitor, visit_label, opt_label);
             visitor.visit_block(block);
         }

compiler/rustc_ast_lowering/src/expr.rs

@@ -131,12 +131,12 @@ impl<'hir> LoweringContext<'_, 'hir> {
                     let span = this.mark_span_with_reason(DesugaringKind::WhileLoop, e.span, None);
                     this.lower_expr_while_in_loop_scope(span, cond, body, *opt_label)
                 }),
-                ExprKind::Loop(body, opt_label) => self.with_loop_scope(e.id, |this| {
+                ExprKind::Loop(body, opt_label, span) => self.with_loop_scope(e.id, |this| {
                     hir::ExprKind::Loop(
                         this.lower_block(body, false),
                         this.lower_label(*opt_label),
                         hir::LoopSource::Loop,
-                        DUMMY_SP,
+                        this.lower_span(*span),
                     )
                 }),
                 ExprKind::TryBlock(body) => self.lower_expr_try_block(body),

compiler/rustc_ast_pretty/src/pprust/state/expr.rs

@@ -377,7 +377,7 @@ impl<'a> State<'a> {
                 self.space();
                 self.print_block_with_attrs(blk, attrs);
             }
-            ast::ExprKind::Loop(ref blk, opt_label) => {
+            ast::ExprKind::Loop(ref blk, opt_label, _) => {
                 if let Some(label) = opt_label {
                     self.print_ident(label.ident);
                     self.word_space(":");

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -167,10 +167,11 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                 );
             }
 
-            self.add_moved_or_invoked_closure_note(location, used_place, &mut err);
+            let closure = self.add_moved_or_invoked_closure_note(location, used_place, &mut err);
 
             let mut is_loop_move = false;
             let mut in_pattern = false;
+            let mut seen_spans = FxHashSet::default();
 
             for move_site in &move_site_vec {
                 let move_out = self.move_data.moves[(*move_site).moi];
@@ -191,37 +192,25 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                     is_loop_move = true;
                 }
 
-                self.explain_captures(
+                if !seen_spans.contains(&move_span) {
-                    &mut err,
+                    if !closure {
-                    span,
+                        self.suggest_ref_or_clone(mpi, move_span, &mut err, &mut in_pattern);
-                    move_span,
-                    move_spans,
-                    *moved_place,
-                    partially_str,
-                    loop_message,
-                    move_msg,
-                    is_loop_move,
-                    maybe_reinitialized_locations.is_empty(),
-                );
-
-                if let (UseSpans::PatUse(span), []) =
-                    (move_spans, &maybe_reinitialized_locations[..])
-                {
-                    if maybe_reinitialized_locations.is_empty() {
-                        err.span_suggestion_verbose(
-                            span.shrink_to_lo(),
-                            &format!(
-                                "borrow this field in the pattern to avoid moving {}",
-                                self.describe_place(moved_place.as_ref())
-                                    .map(|n| format!("`{}`", n))
-                                    .unwrap_or_else(|| "the value".to_string())
-                            ),
-                            "ref ",
-                            Applicability::MachineApplicable,
-                        );
-                        in_pattern = true;
                     }
+
+                    self.explain_captures(
+                        &mut err,
+                        span,
+                        move_span,
+                        move_spans,
+                        *moved_place,
+                        partially_str,
+                        loop_message,
+                        move_msg,
+                        is_loop_move,
+                        maybe_reinitialized_locations.is_empty(),
+                    );
                 }
+                seen_spans.insert(move_span);
             }
 
             use_spans.var_path_only_subdiag(&mut err, desired_action);
@@ -317,6 +306,160 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         }
     }
 
+    fn suggest_ref_or_clone(
+        &mut self,
+        mpi: MovePathIndex,
+        move_span: Span,
+        err: &mut DiagnosticBuilder<'_, ErrorGuaranteed>,
+        in_pattern: &mut bool,
+    ) {
+        struct ExpressionFinder<'hir> {
+            expr_span: Span,
+            expr: Option<&'hir hir::Expr<'hir>>,
+            pat: Option<&'hir hir::Pat<'hir>>,
+            parent_pat: Option<&'hir hir::Pat<'hir>>,
+        }
+        impl<'hir> Visitor<'hir> for ExpressionFinder<'hir> {
+            fn visit_expr(&mut self, e: &'hir hir::Expr<'hir>) {
+                if e.span == self.expr_span {
+                    self.expr = Some(e);
+                }
+                hir::intravisit::walk_expr(self, e);
+            }
+            fn visit_pat(&mut self, p: &'hir hir::Pat<'hir>) {
+                if p.span == self.expr_span {
+                    self.pat = Some(p);
+                }
+                if let hir::PatKind::Binding(hir::BindingAnnotation::NONE, _, i, sub) = p.kind {
+                    if i.span == self.expr_span || p.span == self.expr_span {
+                        self.pat = Some(p);
+                    }
+                    // Check if we are in a situation of `ident @ ident` where we want to suggest
+                    // `ref ident @ ref ident` or `ref ident @ Struct { ref ident }`.
+                    if let Some(subpat) = sub && self.pat.is_none() {
+                        self.visit_pat(subpat);
+                        if self.pat.is_some() {
+                            self.parent_pat = Some(p);
+                        }
+                        return;
+                    }
+                }
+                hir::intravisit::walk_pat(self, p);
+            }
+        }
+        let hir = self.infcx.tcx.hir();
+        if let Some(hir::Node::Item(hir::Item {
+            kind: hir::ItemKind::Fn(_, _, body_id),
+            ..
+        })) = hir.find(hir.local_def_id_to_hir_id(self.mir_def_id()))
+            && let Some(hir::Node::Expr(expr)) = hir.find(body_id.hir_id)
+        {
+            let place = &self.move_data.move_paths[mpi].place;
+            let span = place.as_local()
+                .map(|local| self.body.local_decls[local].source_info.span);
+            let mut finder = ExpressionFinder {
+                expr_span: move_span,
+                expr: None,
+                pat: None,
+                parent_pat: None,
+            };
+            finder.visit_expr(expr);
+            if let Some(span) = span && let Some(expr) = finder.expr {
+                for (_, expr) in hir.parent_iter(expr.hir_id) {
+                    if let hir::Node::Expr(expr) = expr {
+                        if expr.span.contains(span) {
+                            // If the let binding occurs within the same loop, then that
+                            // loop isn't relevant, like in the following, the outermost `loop`
+                            // doesn't play into `x` being moved.
+                            // ```
+                            // loop {
+                            //     let x = String::new();
+                            //     loop {
+                            //         foo(x);
+                            //     }
+                            // }
+                            // ```
+                            break;
+                        }
+                        if let hir::ExprKind::Loop(.., loop_span) = expr.kind {
+                            err.span_label(loop_span, "inside of this loop");
+                        }
+                    }
+                }
+                let typeck = self.infcx.tcx.typeck(self.mir_def_id());
+                let hir_id = hir.get_parent_node(expr.hir_id);
+                if let Some(parent) = hir.find(hir_id) {
+                    let (def_id, args, offset) = if let hir::Node::Expr(parent_expr) = parent
+                        && let hir::ExprKind::MethodCall(_, _, args, _) = parent_expr.kind
+                        && let Some(def_id) = typeck.type_dependent_def_id(parent_expr.hir_id)
+                    {
+                        (def_id.as_local(), args, 1)
+                    } else if let hir::Node::Expr(parent_expr) = parent
+                        && let hir::ExprKind::Call(call, args) = parent_expr.kind
+                        && let ty::FnDef(def_id, _) = typeck.node_type(call.hir_id).kind()
+                    {
+                        (def_id.as_local(), args, 0)
+                    } else {
+                        (None, &[][..], 0)
+                    };
+                    if let Some(def_id) = def_id
+                        && let Some(node) = hir.find(hir.local_def_id_to_hir_id(def_id))
+                        && let Some(fn_sig) = node.fn_sig()
+                        && let Some(ident) = node.ident()
+                        && let Some(pos) = args.iter().position(|arg| arg.hir_id == expr.hir_id)
+                        && let Some(arg) = fn_sig.decl.inputs.get(pos + offset)
+                    {
+                        let mut span: MultiSpan = arg.span.into();
+                        span.push_span_label(
+                            arg.span,
+                            "this parameter takes ownership of the value".to_string(),
+                        );
+                        let descr = match node.fn_kind() {
+                            Some(hir::intravisit::FnKind::ItemFn(..)) | None => "function",
+                            Some(hir::intravisit::FnKind::Method(..)) => "method",
+                            Some(hir::intravisit::FnKind::Closure) => "closure",
+                        };
+                        span.push_span_label(
+                            ident.span,
+                            format!("in this {descr}"),
+                        );
+                        err.span_note(
+                            span,
+                            format!(
+                                "consider changing this parameter type in {descr} `{ident}` to \
+                                 borrow instead if owning the value isn't necessary",
+                            ),
+                        );
+                    }
+                    let place = &self.move_data.move_paths[mpi].place;
+                    let ty = place.ty(self.body, self.infcx.tcx).ty;
+                    if let hir::Node::Expr(parent_expr) = parent
+                        && let hir::ExprKind::Call(call_expr, _) = parent_expr.kind
+                        && let hir::ExprKind::Path(
+                            hir::QPath::LangItem(LangItem::IntoIterIntoIter, _, _)
+                        ) = call_expr.kind
+                    {
+                        // Do not suggest `.clone()` in a `for` loop, we already suggest borrowing.
+                    } else {
+                        self.suggest_cloning(err, ty, move_span);
+                    }
+                }
+            }
+            if let Some(pat) = finder.pat {
+                *in_pattern = true;
+                let mut sugg = vec![(pat.span.shrink_to_lo(), "ref ".to_string())];
+                if let Some(pat) = finder.parent_pat {
+                    sugg.insert(0, (pat.span.shrink_to_lo(), "ref ".to_string()));
+                }
+                err.multipart_suggestion_verbose(
+                    "borrow this binding in the pattern to avoid moving the value",
+                    sugg,
+                    Applicability::MachineApplicable,
+                );
+            }
+        }
+    }
+
     fn report_use_of_uninitialized(
         &self,
         mpi: MovePathIndex,
@@ -590,6 +733,27 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         true
     }
 
+    fn suggest_cloning(&self, err: &mut Diagnostic, ty: Ty<'tcx>, span: Span) {
+        let tcx = self.infcx.tcx;
+        // Try to find predicates on *generic params* that would allow copying `ty`
+        let infcx = tcx.infer_ctxt().build();
+        if infcx
+            .type_implements_trait(
+                tcx.lang_items().clone_trait().unwrap(),
+                [tcx.erase_regions(ty)],
+                self.param_env,
+            )
+            .must_apply_modulo_regions()
+        {
+            err.span_suggestion_verbose(
+                span.shrink_to_hi(),
+                "consider cloning the value if the performance cost is acceptable",
+                ".clone()".to_string(),
+                Applicability::MachineApplicable,
+            );
+        }
+    }
+
     fn suggest_adding_copy_bounds(&self, err: &mut Diagnostic, ty: Ty<'tcx>, span: Span) {
         let tcx = self.infcx.tcx;
         let generics = tcx.generics_of(self.mir_def_id());

compiler/rustc_borrowck/src/diagnostics/mod.rs

@@ -70,7 +70,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         location: Location,
         place: PlaceRef<'tcx>,
         diag: &mut Diagnostic,
-    ) {
+    ) -> bool {
         debug!("add_moved_or_invoked_closure_note: location={:?} place={:?}", location, place);
         let mut target = place.local_or_deref_local();
         for stmt in &self.body[location.block].statements[location.statement_index..] {
@@ -106,7 +106,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                         {
                             place.local_or_deref_local().unwrap()
                         }
-                        _ => return,
+                        _ => return false,
                     };
 
                     debug!("add_moved_or_invoked_closure_note: closure={:?}", closure);
@@ -125,7 +125,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                                     ty::place_to_string_for_capture(self.infcx.tcx, hir_place)
                                 ),
                             );
-                            return;
+                            return true;
                         }
                     }
                 }
@@ -149,9 +149,11 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                             ty::place_to_string_for_capture(self.infcx.tcx, hir_place)
                         ),
                     );
+                    return true;
                 }
             }
         }
+        false
     }
 
     /// End-user visible description of `place` if one can be found.

compiler/rustc_builtin_macros/src/assert/context.rs

@@ -307,7 +307,7 @@ impl<'cx, 'a> Context<'cx, 'a> {
             | ExprKind::InlineAsm(_)
             | ExprKind::Let(_, _, _)
             | ExprKind::Lit(_)
-            | ExprKind::Loop(_, _)
+            | ExprKind::Loop(_, _, _)
             | ExprKind::MacCall(_)
             | ExprKind::Match(_, _)
             | ExprKind::Path(_, _)

compiler/rustc_mir_build/src/thir/pattern/check_match.rs

@@ -1044,11 +1044,19 @@ fn check_borrow_conflicts_in_at_patterns(cx: &MatchVisitor<'_, '_, '_>, pat: &Pa
                     name,
                     typeck_results.node_type(pat.hir_id),
                 );
-                sess.struct_span_err(pat.span, "borrow of moved value")
+                let mut err = sess.struct_span_err(pat.span, "borrow of moved value");
-                    .span_label(binding_span, format!("value moved into `{}` here", name))
+                err.span_label(binding_span, format!("value moved into `{}` here", name))
                     .span_label(binding_span, occurs_because)
-                    .span_labels(conflicts_ref, "value borrowed here after move")
+                    .span_labels(conflicts_ref, "value borrowed here after move");
-                    .emit();
+                if pat.span.contains(binding_span) {
+                    err.span_suggestion_verbose(
+                        binding_span.shrink_to_lo(),
+                        "borrow this binding in the pattern to avoid moving the value",
+                        "ref ".to_string(),
+                        Applicability::MachineApplicable,
+                    );
+                }
+                err.emit();
             }
             return;
         }

compiler/rustc_parse/src/parser/expr.rs

@@ -1734,7 +1734,7 @@ impl<'a> Parser<'a> {
                         expr.kind,
                         ExprKind::While(_, _, None)
                             | ExprKind::ForLoop(_, _, _, None)
-                            | ExprKind::Loop(_, None)
+                            | ExprKind::Loop(_, None, _)
                             | ExprKind::Block(_, None)
                     )
                 {
@@ -2444,10 +2444,11 @@ impl<'a> Parser<'a> {
 
     /// Parses `loop { ... }` (`loop` token already eaten).
     fn parse_loop_expr(&mut self, opt_label: Option<Label>, lo: Span) -> PResult<'a, P<Expr>> {
+        let loop_span = self.prev_token.span;
         let (attrs, body) = self.parse_inner_attrs_and_block()?;
         Ok(self.mk_expr_with_attrs(
             lo.to(self.prev_token.span),
-            ExprKind::Loop(body, opt_label),
+            ExprKind::Loop(body, opt_label, loop_span),
             attrs,
         ))
     }

compiler/rustc_resolve/src/late.rs

@@ -3841,7 +3841,9 @@ impl<'a: 'ast, 'b, 'ast> LateResolutionVisitor<'a, 'b, 'ast> {
                 }
             }
 
-            ExprKind::Loop(ref block, label) => self.resolve_labeled_block(label, expr.id, &block),
+            ExprKind::Loop(ref block, label, _) => {
+                self.resolve_labeled_block(label, expr.id, &block)
+            }
 
             ExprKind::While(ref cond, ref block, label) => {
                 self.with_resolved_label(label, expr.id, |this| {

src/test/ui/binding/issue-53114-borrow-checks.stderr

@@ -17,6 +17,10 @@ LL |     match mm { (_, _y) => { } }
    |           ^^ value used here after partial move
    |
    = note: partial move occurs because `mm.0` has type `M`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     match mm { (ref _x, _) => { } }
+   |                 +++
 
 error[E0382]: use of partially moved value: `mm`
   --> $DIR/issue-53114-borrow-checks.rs:29:11
@@ -28,6 +32,10 @@ LL |     match mm { (_, _) => { } }
    |           ^^ value used here after partial move
    |
    = note: partial move occurs because `mm.1` has type `M`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     match mm { (_, ref _y) => { } }
+   |                    +++
 
 error[E0382]: use of moved value: `m`
   --> $DIR/issue-53114-borrow-checks.rs:36:16
@@ -48,6 +56,10 @@ LL |     if let (_, _y) = mm { }
    |                      ^^ value used here after partial move
    |
    = note: partial move occurs because `mm.0` has type `M`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     if let (ref _x, _) = mm { }
+   |             +++
 
 error[E0382]: use of partially moved value: `mm`
   --> $DIR/issue-53114-borrow-checks.rs:43:21
@@ -59,6 +71,10 @@ LL |     if let (_, _) = mm { }
    |                     ^^ value used here after partial move
    |
    = note: partial move occurs because `mm.1` has type `M`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     if let (_, ref _y) = mm { }
+   |                +++
 
 error: aborting due to 6 previous errors
 

src/test/ui/binop/binop-move-semantics.stderr

@@ -32,6 +32,10 @@ LL |     +
 LL |     x.clone();
    |     ^^^^^^^^^ value borrowed here after move
    |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     x.clone()
+   |      ++++++++
 help: consider further restricting this bound
    |
 LL | fn move_then_borrow<T: Add<Output=()> + Clone + Copy>(x: T) {

src/test/ui/borrowck/bindings-after-at-or-patterns-slice-patterns-box-patterns.stderr

@@ -27,6 +27,11 @@ LL |         a @ [.., _] => (),
 ...
 LL |     &x;
    |     ^^ value borrowed here after move
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ref a @ [.., _] => (),
+   |         +++
 
 error[E0502]: cannot borrow `x` as immutable because it is also borrowed as mutable
   --> $DIR/bindings-after-at-or-patterns-slice-patterns-box-patterns.rs:28:5
@@ -71,13 +76,15 @@ LL | fn bindings_after_at_or_patterns_move(x: Option<Test>) {
    |                                       - move occurs because `x` has type `Option<Test>`, which does not implement the `Copy` trait
 LL |     match x {
 LL |         foo @ Some(Test::Foo | Test::Bar) => (),
-   |         ---
+   |         --- value moved here
-   |         |
-   |         value moved here
-   |         value moved here
 ...
 LL |     &x;
    |     ^^ value borrowed here after move
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ref foo @ Some(Test::Foo | Test::Bar) => (),
+   |         +++
 
 error[E0502]: cannot borrow `x` as mutable because it is also borrowed as immutable
   --> $DIR/bindings-after-at-or-patterns-slice-patterns-box-patterns.rs:86:5
@@ -122,13 +129,15 @@ LL | fn bindings_after_at_slice_patterns_or_patterns_moves(x: [Option<Test>; 4])
    |                                                       - move occurs because `x` has type `[Option<Test>; 4]`, which does not implement the `Copy` trait
 LL |     match x {
 LL |         a @ [.., Some(Test::Foo | Test::Bar)] => (),
-   |         -
+   |         - value moved here
-   |         |
-   |         value moved here
-   |         value moved here
 ...
 LL |     &x;
    |     ^^ value borrowed here after move
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ref a @ [.., Some(Test::Foo | Test::Bar)] => (),
+   |         +++
 
 error[E0502]: cannot borrow `x` as mutable because it is also borrowed as immutable
   --> $DIR/bindings-after-at-or-patterns-slice-patterns-box-patterns.rs:144:5

src/test/ui/borrowck/borrowck-consume-unsize-vec.stderr

@@ -7,6 +7,18 @@ LL |     consume(b);
    |             - value moved here
 LL |     consume(b);
    |             ^ value used here after move
+   |
+note: consider changing this parameter type in function `consume` to borrow instead if owning the value isn't necessary
+  --> $DIR/borrowck-consume-unsize-vec.rs:3:15
+   |
+LL | fn consume(_: Box<[i32]>) {
+   |    -------    ^^^^^^^^^^ this parameter takes ownership of the value
+   |    |
+   |    in this function
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     consume(b.clone());
+   |              ++++++++
 
 error: aborting due to previous error
 

src/test/ui/borrowck/borrowck-consume-upcast-box.stderr

@@ -7,6 +7,14 @@ LL |     consume(b);
    |             - value moved here
 LL |     consume(b);
    |             ^ value used here after move
+   |
+note: consider changing this parameter type in function `consume` to borrow instead if owning the value isn't necessary
+  --> $DIR/borrowck-consume-upcast-box.rs:5:15
+   |
+LL | fn consume(_: Box<dyn Foo>) {
+   |    -------    ^^^^^^^^^^^^ this parameter takes ownership of the value
+   |    |
+   |    in this function
 
 error: aborting due to previous error
 

src/test/ui/borrowck/borrowck-drop-from-guard.stderr

@@ -9,6 +9,11 @@ LL |         Some(_) if { drop(my_str); false } => {}
 LL |         Some(_) => {}
 LL |         None => { foo(my_str); }
    |                       ^^^^^^ value used here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |         Some(_) if { drop(my_str.clone()); false } => {}
+   |                                 ++++++++
 
 error: aborting due to previous error
 

src/test/ui/borrowck/borrowck-loan-in-overloaded-op.stderr

@@ -7,6 +7,11 @@ LL |     let _y = {x} + x.clone(); // the `{x}` forces a move to occur
    |               -    ^^^^^^^^^ value borrowed here after move
    |               |
    |               value moved here
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let _y = {x.clone()} + x.clone(); // the `{x}` forces a move to occur
+   |                ++++++++
 
 error: aborting due to previous error
 

src/test/ui/borrowck/borrowck-move-out-from-array-match.stderr

@@ -8,6 +8,10 @@ LL |         [.., _y] => {}
    |              ^^ value used here after move
    |
    = note: move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [_, _, ref _x] => {}
+   |                +++
 
 error[E0382]: use of partially moved value: `a[..]`
   --> $DIR/borrowck-move-out-from-array-match.rs:23:14
@@ -19,6 +23,10 @@ LL |         [.., _y] => {}
    |              ^^ value used here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [_, _, (ref _x, _)] => {}
+   |                 +++
 
 error[E0382]: use of moved value: `a[..].0`
   --> $DIR/borrowck-move-out-from-array-match.rs:33:15
@@ -30,6 +38,10 @@ LL |         [.., (_y, _)] => {}
    |               ^^ value used here after move
    |
    = note: move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [_, _, (ref _x, _)] => {}
+   |                 +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-match.rs:44:11
@@ -41,6 +53,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [ref _x, _, _] => {}
+   |          +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-match.rs:55:11
@@ -52,6 +68,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [.., ref _x] => {}
+   |              +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-match.rs:66:11
@@ -63,6 +83,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [(ref _x, _), _, _] => {}
+   |           +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-match.rs:77:11
@@ -74,6 +98,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [.., (ref _x, _)] => {}
+   |               +++
 
 error[E0382]: use of moved value: `a[..].0`
   --> $DIR/borrowck-move-out-from-array-match.rs:89:11
@@ -85,6 +113,10 @@ LL |         [(_x, _), _, _] => {}
    |           ^^ value used here after move
    |
    = note: move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [ref _y @ .., _, _] => {}
+   |          +++
 
 error[E0382]: use of moved value: `a[..].0`
   --> $DIR/borrowck-move-out-from-array-match.rs:99:15
@@ -96,6 +128,10 @@ LL |         [.., (_x, _)] => {}
    |               ^^ value used here after move
    |
    = note: move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [_, _, ref _y @ ..] => {}
+   |                +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-match.rs:110:11
@@ -107,6 +143,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [ref x @ .., _] => {}
+   |          +++
 
 error: aborting due to 10 previous errors
 

src/test/ui/borrowck/borrowck-move-out-from-array-no-overlap-match.stderr

@@ -8,6 +8,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [_, _, ref _x] => {}
+   |                +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-no-overlap-match.rs:28:11
@@ -19,6 +23,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [_, _, (ref _x, _)] => {}
+   |                 +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-no-overlap-match.rs:41:11
@@ -30,6 +38,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [ref _x, _, _] => {}
+   |          +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-no-overlap-match.rs:52:11
@@ -41,6 +53,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [.., ref _x] => {}
+   |              +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-no-overlap-match.rs:63:11
@@ -52,6 +68,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [(ref _x, _), _, _] => {}
+   |           +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-no-overlap-match.rs:74:11
@@ -63,6 +83,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [.., (ref _x, _)] => {}
+   |               +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-no-overlap-match.rs:85:11
@@ -74,6 +98,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [_, ref _y @ ..] => {}
+   |             +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-no-overlap-match.rs:96:11
@@ -85,6 +113,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [ref _y @ .., _] => {}
+   |          +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-no-overlap-match.rs:109:11
@@ -96,6 +128,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [ref x @ .., _, _] => {}
+   |          +++
 
 error: aborting due to 9 previous errors
 

src/test/ui/borrowck/borrowck-move-out-from-array-use-match.stderr

@@ -8,6 +8,10 @@ LL |         [.., ref _y] => {}
    |              ^^^^^^ value borrowed here after move
    |
    = note: move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [_, _, ref _x] => {}
+   |                +++
 
 error[E0382]: borrow of partially moved value: `a[..]`
   --> $DIR/borrowck-move-out-from-array-use-match.rs:23:14
@@ -19,6 +23,10 @@ LL |         [.., ref _y] => {}
    |              ^^^^^^ value borrowed here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [_, _, (ref _x, _)] => {}
+   |                 +++
 
 error[E0382]: borrow of moved value: `a[..].0`
   --> $DIR/borrowck-move-out-from-array-use-match.rs:33:15
@@ -30,6 +38,10 @@ LL |         [.., (ref _y, _)] => {}
    |               ^^^^^^ value borrowed here after move
    |
    = note: move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [_, _, (ref _x, _)] => {}
+   |                 +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use-match.rs:44:11
@@ -41,6 +53,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [ref _x, _, _] => {}
+   |          +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use-match.rs:55:11
@@ -52,6 +68,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [.., ref _x] => {}
+   |              +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use-match.rs:66:11
@@ -63,6 +83,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [(ref _x, _), _, _] => {}
+   |           +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use-match.rs:77:11
@@ -74,6 +98,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [.., (ref _x, _)] => {}
+   |               +++
 
 error[E0382]: borrow of moved value: `a[..]`
   --> $DIR/borrowck-move-out-from-array-use-match.rs:89:11
@@ -85,6 +113,10 @@ LL |         [(ref _x, _), _, _] => {}
    |           ^^^^^^ value borrowed here after move
    |
    = note: move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [ref _y @ .., _, _] => {}
+   |          +++
 
 error[E0382]: borrow of moved value: `a[..]`
   --> $DIR/borrowck-move-out-from-array-use-match.rs:99:15
@@ -96,6 +128,10 @@ LL |         [.., (ref _x, _)] => {}
    |               ^^^^^^ value borrowed here after move
    |
    = note: move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [_, _, ref _y @ ..] => {}
+   |                +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use-match.rs:110:11
@@ -107,6 +143,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [ref x @ .., _] => {}
+   |          +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use-match.rs:123:5
@@ -118,6 +158,10 @@ LL |     a[2] = Default::default();
    |     ^^^^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [_, _, ref _x] => {}
+   |                +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use-match.rs:131:5
@@ -129,6 +173,10 @@ LL |     a[2].1 = Default::default();
    |     ^^^^ value used here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [_, _, (ref _x, _)] => {}
+   |                 +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use-match.rs:139:5
@@ -140,6 +188,10 @@ LL |     a[0] = Default::default();
    |     ^^^^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [_, _, ref _x @ ..] => {}
+   |                +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use-match.rs:147:5
@@ -151,6 +203,10 @@ LL |     a[0].1 = Default::default();
    |     ^^^^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [_, _, ref _x @ ..] => {}
+   |                +++
 
 error: aborting due to 14 previous errors
 

src/test/ui/borrowck/borrowck-move-out-from-array-use-no-overlap-match.stderr

@@ -8,6 +8,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [_, _, ref _x] => {}
+   |                +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use-no-overlap-match.rs:28:11
@@ -19,6 +23,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [_, _, (ref _x, _)] => {}
+   |                 +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use-no-overlap-match.rs:41:11
@@ -30,6 +38,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [ref _x, _, _] => {}
+   |          +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use-no-overlap-match.rs:52:11
@@ -41,6 +53,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [.., ref _x] => {}
+   |              +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use-no-overlap-match.rs:63:11
@@ -52,6 +68,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [(ref _x, _), _, _] => {}
+   |           +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use-no-overlap-match.rs:74:11
@@ -63,6 +83,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [.., (ref _x, _)] => {}
+   |               +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use-no-overlap-match.rs:85:11
@@ -74,6 +98,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [_, ref _y @ ..] => {}
+   |             +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use-no-overlap-match.rs:96:11
@@ -85,6 +113,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [ref _y @ .., _] => {}
+   |          +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use-no-overlap-match.rs:109:11
@@ -96,6 +128,10 @@ LL |     match a {
    |           ^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         [ref x @ .., _, _] => {}
+   |          +++
 
 error: aborting due to 9 previous errors
 

src/test/ui/borrowck/borrowck-move-out-from-array-use.stderr

@@ -7,6 +7,10 @@ LL |     let [.., ref _y] = a;
    |              ^^^^^^ value borrowed here after move
    |
    = note: move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [_, _, ref _x] = a;
+   |                +++
 
 error[E0382]: borrow of partially moved value: `a[..]`
   --> $DIR/borrowck-move-out-from-array-use.rs:16:14
@@ -17,6 +21,10 @@ LL |     let [.., ref _y] = a;
    |              ^^^^^^ value borrowed here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [_, _, (ref _x, _)] = a;
+   |                 +++
 
 error[E0382]: borrow of moved value: `a[..].0`
   --> $DIR/borrowck-move-out-from-array-use.rs:22:15
@@ -27,6 +35,10 @@ LL |     let [.., (ref _y, _)] = a;
    |               ^^^^^^ value borrowed here after move
    |
    = note: move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [_, _, (ref _x, _)] = a;
+   |                 +++
 
 error[E0382]: borrow of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use.rs:30:10
@@ -37,6 +49,10 @@ LL |     let [ref _y @ .., _, _] = a;
    |          ^^^^^^ value borrowed here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [ref _x, _, _] = a;
+   |          +++
 
 error[E0382]: borrow of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use.rs:36:16
@@ -47,6 +63,10 @@ LL |     let [_, _, ref _y @ ..] = a;
    |                ^^^^^^ value borrowed here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [.., ref _x] = a;
+   |              +++
 
 error[E0382]: borrow of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use.rs:42:10
@@ -57,6 +77,10 @@ LL |     let [ref _y @ .., _, _] = a;
    |          ^^^^^^ value borrowed here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [(ref _x, _), _, _] = a;
+   |           +++
 
 error[E0382]: borrow of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use.rs:48:16
@@ -67,6 +91,10 @@ LL |     let [_, _, ref _y @ ..] = a;
    |                ^^^^^^ value borrowed here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [.., (ref _x, _)] = a;
+   |               +++
 
 error[E0382]: borrow of moved value: `a[..]`
   --> $DIR/borrowck-move-out-from-array-use.rs:54:11
@@ -77,6 +105,10 @@ LL |     let [(ref _x, _), _, _] = a;
    |           ^^^^^^ value borrowed here after move
    |
    = note: move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [ref _y @ .., _, _] = a;
+   |          +++
 
 error[E0382]: borrow of moved value: `a[..]`
   --> $DIR/borrowck-move-out-from-array-use.rs:60:15
@@ -87,6 +119,10 @@ LL |     let [.., (ref _x, _)] = a;
    |               ^^^^^^ value borrowed here after move
    |
    = note: move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [_, _, ref _y @ ..] = a;
+   |                +++
 
 error[E0382]: borrow of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use.rs:68:13
@@ -97,6 +133,10 @@ LL |     let [_, ref _y @ ..] = a;
    |             ^^^^^^ value borrowed here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [ref x @ .., _] = a;
+   |          +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use.rs:76:5
@@ -107,6 +147,10 @@ LL |     a[2] = Default::default();
    |     ^^^^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [_, _, ref _x] = a;
+   |                +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use.rs:82:5
@@ -117,6 +161,10 @@ LL |     a[2].1 = Default::default();
    |     ^^^^ value used here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [_, _, (ref _x, _)] = a;
+   |                 +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use.rs:88:5
@@ -127,6 +175,10 @@ LL |     a[0] = Default::default();
    |     ^^^^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [_, _, ref _x @ ..] = a;
+   |                +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array-use.rs:94:5
@@ -137,6 +189,10 @@ LL |     a[0].1 = Default::default();
    |     ^^^^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [_, _, ref _x @ ..] = a;
+   |                +++
 
 error: aborting due to 14 previous errors
 

src/test/ui/borrowck/borrowck-move-out-from-array.stderr

@@ -7,6 +7,10 @@ LL |     let [.., _y] = a;
    |              ^^ value used here after move
    |
    = note: move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [_, _, ref _x] = a;
+   |                +++
 
 error[E0382]: use of partially moved value: `a[..]`
   --> $DIR/borrowck-move-out-from-array.rs:16:14
@@ -17,6 +21,10 @@ LL |     let [.., _y] = a;
    |              ^^ value used here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [_, _, (ref _x, _)] = a;
+   |                 +++
 
 error[E0382]: use of moved value: `a[..].0`
   --> $DIR/borrowck-move-out-from-array.rs:22:15
@@ -27,6 +35,10 @@ LL |     let [.., (_y, _)] = a;
    |               ^^ value used here after move
    |
    = note: move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [_, _, (ref _x, _)] = a;
+   |                 +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array.rs:30:10
@@ -37,6 +49,10 @@ LL |     let [_y @ .., _, _] = a;
    |          ^^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [ref _x, _, _] = a;
+   |          +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array.rs:36:16
@@ -47,6 +63,10 @@ LL |     let [_, _, _y @ ..] = a;
    |                ^^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [.., ref _x] = a;
+   |              +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array.rs:42:10
@@ -57,6 +77,10 @@ LL |     let [_y @ .., _, _] = a;
    |          ^^ value used here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [(ref _x, _), _, _] = a;
+   |           +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array.rs:48:16
@@ -67,6 +91,10 @@ LL |     let [_, _, _y @ ..] = a;
    |                ^^ value used here after partial move
    |
    = note: partial move occurs because `a[..].0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [.., (ref _x, _)] = a;
+   |               +++
 
 error[E0382]: use of moved value: `a[..].0`
   --> $DIR/borrowck-move-out-from-array.rs:54:11
@@ -77,6 +105,10 @@ LL |     let [(_x, _), _, _] = a;
    |           ^^ value used here after move
    |
    = note: move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [ref _y @ .., _, _] = a;
+   |          +++
 
 error[E0382]: use of moved value: `a[..].0`
   --> $DIR/borrowck-move-out-from-array.rs:60:15
@@ -87,6 +119,10 @@ LL |     let [.., (_x, _)] = a;
    |               ^^ value used here after move
    |
    = note: move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [_, _, ref _y @ ..] = a;
+   |                +++
 
 error[E0382]: use of partially moved value: `a`
   --> $DIR/borrowck-move-out-from-array.rs:68:13
@@ -97,6 +133,10 @@ LL |     let [_, _y @ ..] = a;
    |             ^^ value used here after partial move
    |
    = note: partial move occurs because `a[..]` has type `(String, String)`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let [ref x @ .., _] = a;
+   |          +++
 
 error: aborting due to 10 previous errors
 

src/test/ui/borrowck/borrowck-multiple-captures.stderr

@@ -40,6 +40,11 @@ LL |     thread::spawn(move|| {
 ...
 LL |         drop(x1);
    |              -- use occurs due to use in closure
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     drop(x1.clone());
+   |            ++++++++
 
 error[E0382]: use of moved value: `x2`
   --> $DIR/borrowck-multiple-captures.rs:27:19
@@ -53,6 +58,11 @@ LL |     thread::spawn(move|| {
 ...
 LL |         drop(x2);
    |              -- use occurs due to use in closure
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     drop(x2.clone());
+   |            ++++++++
 
 error[E0382]: use of moved value: `x`
   --> $DIR/borrowck-multiple-captures.rs:41:14
@@ -100,6 +110,11 @@ LL |     thread::spawn(move|| {
 LL |
 LL |         drop(x);
    |              - use occurs due to use in closure
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     drop(x.clone());
+   |           ++++++++
 
 error: aborting due to 8 previous errors
 

src/test/ui/borrowck/borrowck-overloaded-index-move-index.stderr

@@ -33,6 +33,11 @@ LL |     println!("{}", f[s]);
 ...
 LL |     f[s] = 10;
    |       ^ value used here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     println!("{}", f[s.clone()]);
+   |                       ++++++++
 
 error: aborting due to 3 previous errors
 

src/test/ui/borrowck/borrowck-reinit.stderr

@@ -8,6 +8,11 @@ LL |     drop(x);
    |          - value moved here
 LL |     let _ = (1,x);
    |                ^ value used here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     drop(x.clone());
+   |           ++++++++
 
 error: aborting due to previous error
 

src/test/ui/borrowck/issue-31287-drop-in-guard.stderr

@@ -8,6 +8,11 @@ LL |         Some(_) if { drop(a); false } => None,
    |                           - value moved here
 LL |         x => x,
    |         ^ value used here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |         Some(_) if { drop(a.clone()); false } => None,
+   |                            ++++++++
 
 error: aborting due to previous error
 

src/test/ui/borrowck/issue-41962.stderr

@@ -5,7 +5,7 @@ LL |         if let Some(thing) = maybe {
    |                     ^^^^^ value moved here, in previous iteration of loop
    |
    = note: move occurs because value has type `Vec<bool>`, which does not implement the `Copy` trait
-help: borrow this field in the pattern to avoid moving `maybe.0`
+help: borrow this binding in the pattern to avoid moving the value
    |
 LL |         if let Some(ref thing) = maybe {
    |                     +++

src/test/ui/borrowck/issue-83760.stderr

@@ -8,6 +8,10 @@ LL |             val = None;
    |             ---------- this reinitialization might get skipped
    |
    = note: move occurs because value has type `Struct`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     while let Some(ref foo) = val {
+   |                    +++
 
 error[E0382]: use of moved value: `foo`
   --> $DIR/issue-83760.rs:21:14

src/test/ui/borrowck/move-in-pattern-mut-in-loop.stderr

@@ -5,7 +5,7 @@ LL |         if let Some(mut _x) = opt {}
    |                     ^^^^^^ value moved here, in previous iteration of loop
    |
    = note: move occurs because value has type `&mut i32`, which does not implement the `Copy` trait
-help: borrow this field in the pattern to avoid moving `opt.0`
+help: borrow this binding in the pattern to avoid moving the value
    |
 LL |         if let Some(ref mut _x) = opt {}
    |                     +++

src/test/ui/borrowck/move-in-pattern-mut.stderr

@@ -8,7 +8,7 @@ LL |     foo(s);
    |         ^ value used here after partial move
    |
    = note: partial move occurs because value has type `S`, which does not implement the `Copy` trait
-help: borrow this field in the pattern to avoid moving `s.0`
+help: borrow this binding in the pattern to avoid moving the value
    |
 LL |     if let Some(ref mut x) = s {
    |                 +++
@@ -23,7 +23,7 @@ LL |     bar(e);
    |         ^ value used here after partial move
    |
    = note: partial move occurs because value has type `S`, which does not implement the `Copy` trait
-help: borrow this field in the pattern to avoid moving `e.s`
+help: borrow this binding in the pattern to avoid moving the value
    |
 LL |     let E::V { s: ref mut x } = e;
    |                   +++

src/test/ui/borrowck/move-in-pattern.stderr

@@ -8,7 +8,7 @@ LL |     foo(s);
    |         ^ value used here after partial move
    |
    = note: partial move occurs because value has type `S`, which does not implement the `Copy` trait
-help: borrow this field in the pattern to avoid moving `s.0`
+help: borrow this binding in the pattern to avoid moving the value
    |
 LL |     if let Some(ref x) = s {
    |                 +++
@@ -23,7 +23,7 @@ LL |     bar(e);
    |         ^ value used here after partial move
    |
    = note: partial move occurs because value has type `S`, which does not implement the `Copy` trait
-help: borrow this field in the pattern to avoid moving `e.s`
+help: borrow this binding in the pattern to avoid moving the value
    |
 LL |     let E::V { s: ref x } = e;
    |                   +++

src/test/ui/borrowck/mut-borrow-in-loop-2.stderr

@@ -4,9 +4,17 @@ error[E0382]: use of moved value: `value`
 LL | fn this_does_not<'a, R>(value: &'a mut Events<R>) {
    |                         ----- move occurs because `value` has type `&mut Events<R>`, which does not implement the `Copy` trait
 LL |     for _ in 0..3 {
+   |     ------------- inside of this loop
 LL |         Other::handle(value);
    |                       ^^^^^ value moved here, in previous iteration of loop
    |
+note: consider changing this parameter type in function `handle` to borrow instead if owning the value isn't necessary
+  --> $DIR/mut-borrow-in-loop-2.rs:9:22
+   |
+LL |     fn handle(value: T) -> Self;
+   |        ------        ^ this parameter takes ownership of the value
+   |        |
+   |        in this function
 help: consider creating a fresh reborrow of `value` here
    |
 LL |         Other::handle(&mut *value);

src/test/ui/borrowck/or-patterns.stderr

@@ -8,6 +8,10 @@ LL |     &x.0 .0;
    |     ^^^^^^^ value borrowed here after move
    |
    = note: move occurs because `x.0.0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ((ref y, _) | (_, y),) => (),
+   |           +++
 
 error[E0382]: borrow of moved value: `x.0.1`
   --> $DIR/or-patterns.rs:10:5
@@ -19,6 +23,10 @@ LL |     &x.0 .1;
    |     ^^^^^^^ value borrowed here after move
    |
    = note: move occurs because `x.0.1` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ((y, _) | (_, ref y),) => (),
+   |                       +++
 
 error[E0502]: cannot borrow `x.0.0` as mutable because it is also borrowed as immutable
   --> $DIR/or-patterns.rs:18:5
@@ -77,6 +85,10 @@ LL |     &x.0 .0;
    |     ^^^^^^^ value borrowed here after move
    |
    = note: move occurs because `x.0.0` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ((ref y, _) | (_, y),) = x;
+   |           +++
 
 error[E0382]: borrow of moved value: `x.0.1`
   --> $DIR/or-patterns.rs:40:5
@@ -88,6 +100,10 @@ LL |     &x.0 .1;
    |     ^^^^^^^ value borrowed here after move
    |
    = note: move occurs because `x.0.1` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ((y, _) | (_, ref y),) = x;
+   |                       +++
 
 error[E0502]: cannot borrow `x.0.0` as mutable because it is also borrowed as immutable
   --> $DIR/or-patterns.rs:46:5

src/test/ui/codemap_tests/tab_3.stderr

@@ -15,6 +15,10 @@ note: this function takes ownership of the receiver `self`, which moves `some_ve
 LL |     fn into_iter(self) -> Self::IntoIter;
    |                  ^^^^
    = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     some_vec.clone().into_iter();
+   |             ++++++++
 
 error: aborting due to previous error
 

src/test/ui/drop/repeat-drop-2.stderr

@@ -7,6 +7,11 @@ LL |     let _bar = foo;
    |                --- value moved here
 LL |     let _baz = [foo; 0];
    |                 ^^^ value used here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let _bar = foo.clone();
+   |                   ++++++++
 
 error[E0493]: destructor of `String` cannot be evaluated at compile-time
   --> $DIR/repeat-drop-2.rs:7:25

src/test/ui/issues/issue-29723.stderr

@@ -9,6 +9,11 @@ LL |         0 if { drop(s); false } => String::from("oops"),
 ...
 LL |             s
    |             ^ value used here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |         0 if { drop(s.clone()); false } => String::from("oops"),
+   |                      ++++++++
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-42796.stderr

@@ -10,6 +10,10 @@ LL |     println!("{}", s);
    |                    ^ value borrowed here after move
    |
    = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let mut s_copy = s.clone();
+   |                       ++++++++
 
 error: aborting due to previous error
 

src/test/ui/liveness/liveness-move-call-arg.stderr

@@ -3,9 +3,23 @@ error[E0382]: use of moved value: `x`
    |
 LL |     let x: Box<isize> = Box::new(25);
    |         - move occurs because `x` has type `Box<isize>`, which does not implement the `Copy` trait
-...
+LL |
+LL |     loop {
+   |     ---- inside of this loop
 LL |         take(x);
    |              ^ value moved here, in previous iteration of loop
+   |
+note: consider changing this parameter type in function `take` to borrow instead if owning the value isn't necessary
+  --> $DIR/liveness-move-call-arg.rs:1:13
+   |
+LL | fn take(_x: Box<isize>) {}
+   |    ----     ^^^^^^^^^^ this parameter takes ownership of the value
+   |    |
+   |    in this function
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |         take(x.clone());
+   |               ++++++++
 
 error: aborting due to previous error
 

src/test/ui/liveness/liveness-move-in-loop.stderr

@@ -4,8 +4,22 @@ error[E0382]: use of moved value: `y`
 LL |     let y: Box<isize> = 42.into();
    |         - move occurs because `y` has type `Box<isize>`, which does not implement the `Copy` trait
 ...
+LL |     loop {
+   |     ---- inside of this loop
+LL |         println!("{}", y);
+LL |         loop {
+   |         ---- inside of this loop
+LL |             loop {
+   |             ---- inside of this loop
+LL |                 loop {
+   |                 ---- inside of this loop
 LL |                     x = y;
    |                         ^ value moved here, in previous iteration of loop
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |                     x = y.clone();
+   |                          ++++++++
 
 error: aborting due to previous error
 

src/test/ui/liveness/liveness-move-in-while.stderr

@@ -24,12 +24,22 @@ error[E0382]: borrow of moved value: `y`
 LL |     let y: Box<isize> = 42.into();
    |         - move occurs because `y` has type `Box<isize>`, which does not implement the `Copy` trait
 ...
+LL |     loop {
+   |     ---- inside of this loop
 LL |         println!("{}", y);
    |                        ^ value borrowed here after move
 LL |         while true { while true { while true { x = y; x.clone(); } } }
-   |                                                    - value moved here, in previous iteration of loop
+   |         ----------   ----------   ----------       - value moved here, in previous iteration of loop
+   |         |            |            |
+   |         |            |            inside of this loop
+   |         |            inside of this loop
+   |         inside of this loop
    |
    = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |         while true { while true { while true { x = y.clone(); x.clone(); } } }
+   |                                                     ++++++++
 
 error: aborting due to previous error; 3 warnings emitted
 

src/test/ui/liveness/liveness-use-after-move.stderr

@@ -10,6 +10,10 @@ LL |     println!("{}", *x);
    |                    ^^ value borrowed here after move
    |
    = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let y = x.clone();
+   |              ++++++++
 
 error: aborting due to previous error
 

src/test/ui/liveness/liveness-use-after-send.stderr

@@ -8,7 +8,16 @@ LL |     send(ch, message);
 LL |     println!("{}", message);
    |                    ^^^^^^^ value borrowed here after move
    |
+note: consider changing this parameter type in function `send` to borrow instead if owning the value isn't necessary
+  --> $DIR/liveness-use-after-send.rs:3:54
+   |
+LL | fn send<T:Send + std::fmt::Debug>(ch: Chan<T>, data: T) {
+   |    ---- in this function                             ^ this parameter takes ownership of the value
    = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     send(ch, message.clone());
+   |                     ++++++++
 
 error: aborting due to previous error
 

src/test/ui/moves/borrow-closures-instead-of-move.stderr

@@ -4,9 +4,17 @@ error[E0382]: use of moved value: `f`
 LL | fn takes_fn(f: impl Fn()) {
    |             - move occurs because `f` has type `impl Fn()`, which does not implement the `Copy` trait
 LL |     loop {
+   |     ---- inside of this loop
 LL |         takes_fnonce(f);
    |                      ^ value moved here, in previous iteration of loop
    |
+note: consider changing this parameter type in function `takes_fnonce` to borrow instead if owning the value isn't necessary
+  --> $DIR/borrow-closures-instead-of-move.rs:34:20
+   |
+LL | fn takes_fnonce(_: impl FnOnce()) {}
+   |    ------------    ^^^^^^^^^^^^^ this parameter takes ownership of the value
+   |    |
+   |    in this function
 help: consider borrowing `f`
    |
 LL |         takes_fnonce(&f);
@@ -24,6 +32,13 @@ LL |         takes_fnonce(m);
 LL |     takes_fnonce(m);
    |                  ^ value used here after move
    |
+note: consider changing this parameter type in function `takes_fnonce` to borrow instead if owning the value isn't necessary
+  --> $DIR/borrow-closures-instead-of-move.rs:34:20
+   |
+LL | fn takes_fnonce(_: impl FnOnce()) {}
+   |    ------------    ^^^^^^^^^^^^^ this parameter takes ownership of the value
+   |    |
+   |    in this function
 help: consider mutably borrowing `m`
    |
 LL |         takes_fnonce(&mut m);

src/test/ui/moves/issue-46099-move-in-macro.stderr

@@ -5,6 +5,11 @@ LL |     let b = Box::new(true);
    |         - move occurs because `b` has type `Box<bool>`, which does not implement the `Copy` trait
 LL |     test!({b});
    |            ^ value used here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     test!({b.clone()});
+   |             ++++++++
 
 error: aborting due to previous error
 

src/test/ui/moves/issue-72649-uninit-in-loop.rs

@@ -25,7 +25,7 @@ fn moved_here_1() {
 fn moved_here_2() {
     let value = NonCopy{};
     //~^ NOTE move occurs because `value` has type `NonCopy`, which does not implement the `Copy` trait
-    loop {
+    loop { //~ NOTE inside of this loop
         let _used = value;
         //~^ NOTE value moved here
         loop {
@@ -38,7 +38,7 @@ fn moved_here_2() {
 fn moved_loop_1() {
     let value = NonCopy{};
     //~^ NOTE move occurs because `value` has type `NonCopy`, which does not implement the `Copy` trait
-    loop {
+    loop { //~ NOTE inside of this loop
         let _used = value; //~ ERROR use of moved value: `value`
         //~^ NOTE value moved here, in previous iteration of loop
     }
@@ -49,7 +49,7 @@ fn moved_loop_2() {
     //~^ NOTE move occurs because `value` has type `NonCopy`, which does not implement the `Copy` trait
     let _used = value;
     value = NonCopy{};
-    loop {
+    loop { //~ NOTE inside of this loop
         let _used2 = value; //~ ERROR use of moved value: `value`
         //~^ NOTE value moved here, in previous iteration of loop
     }

src/test/ui/moves/issue-72649-uninit-in-loop.stderr

@@ -15,7 +15,9 @@ error[E0382]: use of moved value: `value`
    |
 LL |     let value = NonCopy{};
    |         ----- move occurs because `value` has type `NonCopy`, which does not implement the `Copy` trait
-...
+LL |
+LL |     loop {
+   |     ---- inside of this loop
 LL |         let _used = value;
    |                     ----- value moved here
 ...
@@ -27,7 +29,9 @@ error[E0382]: use of moved value: `value`
    |
 LL |     let value = NonCopy{};
    |         ----- move occurs because `value` has type `NonCopy`, which does not implement the `Copy` trait
-...
+LL |
+LL |     loop {
+   |     ---- inside of this loop
 LL |         let _used = value;
    |                     ^^^^^ value moved here, in previous iteration of loop
 
@@ -37,6 +41,8 @@ error[E0382]: use of moved value: `value`
 LL |     let mut value = NonCopy{};
    |         --------- move occurs because `value` has type `NonCopy`, which does not implement the `Copy` trait
 ...
+LL |     loop {
+   |     ---- inside of this loop
 LL |         let _used2 = value;
    |                      ^^^^^ value moved here, in previous iteration of loop
 

src/test/ui/moves/move-fn-self-receiver.stderr

@@ -96,6 +96,10 @@ note: this function takes ownership of the receiver `self`, which moves `rc_foo`
    |
 LL |     fn use_rc_self(self: Rc<Self>) {}
    |                    ^^^^
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     rc_foo.clone().use_rc_self();
+   |           ++++++++
 
 error[E0382]: use of moved value: `foo_add`
   --> $DIR/move-fn-self-receiver.rs:59:5
@@ -137,6 +141,11 @@ LL |     for _val in explicit_into_iter.into_iter() {}
    |                                    ----------- `explicit_into_iter` moved due to this method call
 LL |     explicit_into_iter;
    |     ^^^^^^^^^^^^^^^^^^ value used here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     for _val in explicit_into_iter.clone().into_iter() {}
+   |                                   ++++++++
 
 error[E0382]: use of moved value: `container`
   --> $DIR/move-fn-self-receiver.rs:71:5
@@ -160,6 +169,7 @@ error[E0382]: use of moved value: `foo2`
 LL |     let foo2 = Foo;
    |         ---- move occurs because `foo2` has type `Foo`, which does not implement the `Copy` trait
 LL |     loop {
+   |     ---- inside of this loop
 LL |         foo2.use_self();
    |         ^^^^ ---------- `foo2` moved due to this method call, in previous iteration of loop
 

src/test/ui/moves/move-guard-same-consts.stderr

@@ -8,6 +8,18 @@ LL |         (1, 2) if take(x) => (),
    |                        - value moved here
 LL |         (1, 2) if take(x) => (),
    |                        ^ value used here after move
+   |
+note: consider changing this parameter type in function `take` to borrow instead if owning the value isn't necessary
+  --> $DIR/move-guard-same-consts.rs:25:15
+   |
+LL | fn take<T>(_: T) -> bool { false }
+   |    ----       ^ this parameter takes ownership of the value
+   |    |
+   |    in this function
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |         (1, 2) if take(x.clone()) => (),
+   |                         ++++++++
 
 error: aborting due to previous error
 

src/test/ui/moves/move-in-guard-1.stderr

@@ -8,6 +8,18 @@ LL |         (1, _) if take(x) => (),
    |                        - value moved here
 LL |         (_, 2) if take(x) => (),
    |                        ^ value used here after move
+   |
+note: consider changing this parameter type in function `take` to borrow instead if owning the value isn't necessary
+  --> $DIR/move-in-guard-1.rs:15:15
+   |
+LL | fn take<T>(_: T) -> bool { false }
+   |    ----       ^ this parameter takes ownership of the value
+   |    |
+   |    in this function
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |         (1, _) if take(x.clone()) => (),
+   |                         ++++++++
 
 error: aborting due to previous error
 

src/test/ui/moves/move-in-guard-2.stderr

@@ -6,6 +6,18 @@ LL |     let x: Box<_> = Box::new(1);
 ...
 LL |         (_, 2) if take(x) => (),
    |                        ^ value used here after move
+   |
+note: consider changing this parameter type in function `take` to borrow instead if owning the value isn't necessary
+  --> $DIR/move-in-guard-2.rs:13:15
+   |
+LL | fn take<T>(_: T) -> bool { false }
+   |    ----       ^ this parameter takes ownership of the value
+   |    |
+   |    in this function
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |         (_, 2) if take(x.clone()) => (),
+   |                         ++++++++
 
 error: aborting due to previous error
 

src/test/ui/moves/moves-based-on-type-access-to-field.stderr

@@ -13,6 +13,10 @@ note: this function takes ownership of the receiver `self`, which moves `x`
    |
 LL |     fn into_iter(self) -> Self::IntoIter;
    |                  ^^^^
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     consume(x.clone().into_iter().next().unwrap());
+   |              ++++++++
 
 error: aborting due to previous error
 

src/test/ui/moves/moves-based-on-type-cyclic-types-issue-4821.stderr

@@ -8,7 +8,7 @@ LL |     consume(node) + r
    |             ^^^^ value used here after partial move
    |
    = note: partial move occurs because value has type `Box<List>`, which does not implement the `Copy` trait
-help: borrow this field in the pattern to avoid moving `node.next.0`
+help: borrow this binding in the pattern to avoid moving the value
    |
 LL |         Some(ref right) => consume(right),
    |              +++

src/test/ui/moves/moves-based-on-type-distribute-copy-over-paren.stderr

@@ -9,6 +9,11 @@ LL |     let _y = Foo { f:x };
 LL |
 LL |     touch(&x);
    |           ^^ value borrowed here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let _y = Foo { f:x.clone() };
+   |                       ++++++++
 
 error[E0382]: borrow of moved value: `x`
   --> $DIR/moves-based-on-type-distribute-copy-over-paren.rs:21:11
@@ -21,6 +26,11 @@ LL |     let _y = Foo { f:(((x))) };
 LL |
 LL |     touch(&x);
    |           ^^ value borrowed here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let _y = Foo { f:(((x))).clone() };
+   |                             ++++++++
 
 error: aborting due to 2 previous errors
 

src/test/ui/moves/moves-based-on-type-exprs.stderr

@@ -7,6 +7,11 @@ LL |     let _y = Foo { f:x };
    |                      - value moved here
 LL |     touch(&x);
    |           ^^ value borrowed here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let _y = Foo { f:x.clone() };
+   |                       ++++++++
 
 error[E0382]: borrow of moved value: `x`
   --> $DIR/moves-based-on-type-exprs.rs:18:11
@@ -17,6 +22,11 @@ LL |     let _y = (x, 3);
    |               - value moved here
 LL |     touch(&x);
    |           ^^ value borrowed here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let _y = (x.clone(), 3);
+   |                ++++++++
 
 error[E0382]: borrow of moved value: `x`
   --> $DIR/moves-based-on-type-exprs.rs:35:11
@@ -29,6 +39,11 @@ LL |         x
 ...
 LL |     touch(&x);
    |           ^^ value borrowed here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |         x.clone()
+   |          ++++++++
 
 error[E0382]: borrow of moved value: `y`
   --> $DIR/moves-based-on-type-exprs.rs:36:11
@@ -41,6 +56,11 @@ LL |         y
 ...
 LL |     touch(&y);
    |           ^^ value borrowed here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |         y.clone()
+   |          ++++++++
 
 error[E0382]: borrow of moved value: `x`
   --> $DIR/moves-based-on-type-exprs.rs:46:11
@@ -53,6 +73,11 @@ LL |         true => x,
 ...
 LL |     touch(&x);
    |           ^^ value borrowed here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |         true => x.clone(),
+   |                  ++++++++
 
 error[E0382]: borrow of moved value: `y`
   --> $DIR/moves-based-on-type-exprs.rs:47:11
@@ -65,6 +90,11 @@ LL |         false => y
 ...
 LL |     touch(&y);
    |           ^^ value borrowed here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |         false => y.clone()
+   |                   ++++++++
 
 error[E0382]: borrow of moved value: `x`
   --> $DIR/moves-based-on-type-exprs.rs:58:11
@@ -77,6 +107,18 @@ LL |         _ if guard(x) => 10,
 ...
 LL |     touch(&x);
    |           ^^ value borrowed here after move
+   |
+note: consider changing this parameter type in function `guard` to borrow instead if owning the value isn't necessary
+  --> $DIR/moves-based-on-type-exprs.rs:6:14
+   |
+LL | fn guard(_s: String) -> bool {panic!()}
+   |    -----     ^^^^^^ this parameter takes ownership of the value
+   |    |
+   |    in this function
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |         _ if guard(x.clone()) => 10,
+   |                     ++++++++
 
 error[E0382]: borrow of moved value: `x`
   --> $DIR/moves-based-on-type-exprs.rs:65:11
@@ -87,6 +129,11 @@ LL |     let _y = [x];
    |               - value moved here
 LL |     touch(&x);
    |           ^^ value borrowed here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let _y = [x.clone()];
+   |                ++++++++
 
 error[E0382]: borrow of moved value: `x`
   --> $DIR/moves-based-on-type-exprs.rs:71:11
@@ -97,6 +144,11 @@ LL |     let _y = vec![x];
    |                   - value moved here
 LL |     touch(&x);
    |           ^^ value borrowed here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let _y = vec![x.clone()];
+   |                    ++++++++
 
 error[E0382]: borrow of moved value: `x`
   --> $DIR/moves-based-on-type-exprs.rs:77:11
@@ -113,6 +165,10 @@ note: this function takes ownership of the receiver `self`, which moves `x`
    |
 LL |     fn into_iter(self) -> Self::IntoIter;
    |                  ^^^^
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let _y = x.clone().into_iter().next().unwrap();
+   |               ++++++++
 
 error[E0382]: borrow of moved value: `x`
   --> $DIR/moves-based-on-type-exprs.rs:83:11
@@ -129,6 +185,10 @@ note: this function takes ownership of the receiver `self`, which moves `x`
    |
 LL |     fn into_iter(self) -> Self::IntoIter;
    |                  ^^^^
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let _y = [x.clone().into_iter().next().unwrap(); 1];
+   |                ++++++++
 
 error: aborting due to 11 previous errors
 

src/test/ui/moves/moves-based-on-type-match-bindings.stderr

@@ -8,6 +8,10 @@ LL |     touch(&x);
    |           ^^ value borrowed here after partial move
    |
    = note: partial move occurs because `x.f` has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         Foo {ref f} => {}
+   |              +++
 
 error: aborting due to previous error
 

src/test/ui/moves/moves-based-on-type-tuple.stderr

@@ -8,6 +8,11 @@ LL |     Box::new((x, x))
    |               -  ^ value used here after move
    |               |
    |               value moved here
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     Box::new((x.clone(), x))
+   |                ++++++++
 
 error: aborting due to previous error
 

src/test/ui/moves/use_of_moved_value_clone_suggestions.stderr

@@ -7,6 +7,11 @@ LL |     (t, t)
    |      -  ^ value used here after move
    |      |
    |      value moved here
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     (t.clone(), t)
+   |       ++++++++
 
 error: aborting due to previous error
 

src/test/ui/nll/closure-access-spans.stderr

@@ -67,6 +67,11 @@ LL |     || x.len();
    |     ^^ - borrow occurs due to use in closure
    |     |
    |     value borrowed here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let r = x.clone();
+   |              ++++++++
 
 error[E0382]: borrow of moved value: `x`
   --> $DIR/closure-access-spans.rs:40:5
@@ -79,6 +84,11 @@ LL |     || x = String::new();
    |     ^^ - borrow occurs due to use in closure
    |     |
    |     value borrowed here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let r = x.clone();
+   |              ++++++++
 
 error[E0382]: borrow of moved value: `x`
   --> $DIR/closure-access-spans.rs:45:5

src/test/ui/nll/issue-21232-partial-init-and-use.stderr

@@ -37,6 +37,11 @@ LL |     let mut t: T = (0, Box::new(0)); drop(t);
    |         move occurs because `t` has type `(u32, Box<u32>)`, which does not implement the `Copy` trait
 LL |     t.0 = 10; t.1 = Box::new(20);
    |     ^^^^^^^^ value partially assigned here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let mut t: T = (0, Box::new(0)); drop(t.clone());
+   |                                            ++++++++
 
 error[E0381]: partially assigned binding `s` isn't fully initialized
   --> $DIR/issue-21232-partial-init-and-use.rs:123:5
@@ -77,6 +82,11 @@ LL |     let mut t: T = (0, Box::new(0)); drop(t);
    |         move occurs because `t` has type `(u32, Box<u32>)`, which does not implement the `Copy` trait
 LL |     t.0 = 10;
    |     ^^^^^^^^ value partially assigned here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let mut t: T = (0, Box::new(0)); drop(t.clone());
+   |                                            ++++++++
 
 error[E0381]: partially assigned binding `s` isn't fully initialized
   --> $DIR/issue-21232-partial-init-and-use.rs:149:5
@@ -208,6 +218,11 @@ LL |         c2 => {
    |         -- value moved here
 LL |             c.0 = 2;
    |             ^^^^^^^ value partially assigned here after move
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ref c2 => {
+   |         +++
 
 error[E0382]: assign to part of moved value: `c`
   --> $DIR/issue-21232-partial-init-and-use.rs:255:13
@@ -219,6 +234,11 @@ LL |         c2 => {
    |         -- value moved here
 LL |             (c.1).0 = 2;
    |             ^^^^^^^^^^^ value partially assigned here after move
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ref c2 => {
+   |         +++
 
 error[E0382]: assign to part of moved value: `c.1`
   --> $DIR/issue-21232-partial-init-and-use.rs:263:13
@@ -229,6 +249,10 @@ LL |             ((c.1).1).0 = 3;
    |             ^^^^^^^^^^^^^^^ value partially assigned here after move
    |
    = note: move occurs because `c.1` has type `(i32, (i32, String))`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ref c2 => {
+   |         +++
 
 error: aborting due to 23 previous errors
 

src/test/ui/nll/issue-51512.stderr

@@ -7,6 +7,11 @@ LL |     let r = range;
    |             ----- value moved here
 LL |     let x = range.start;
    |             ^^^^^^^^^^^ value used here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let r = range.clone();
+   |                  ++++++++
 
 error: aborting due to previous error
 

src/test/ui/nll/issue-53807.stderr

@@ -5,7 +5,7 @@ LL |         if let Some(thing) = maybe {
    |                     ^^^^^ value moved here, in previous iteration of loop
    |
    = note: move occurs because value has type `Vec<bool>`, which does not implement the `Copy` trait
-help: borrow this field in the pattern to avoid moving `maybe.0`
+help: borrow this binding in the pattern to avoid moving the value
    |
 LL |         if let Some(ref thing) = maybe {
    |                     +++

src/test/ui/nll/match-cfg-fake-edges.stderr

@@ -26,6 +26,11 @@ LL |         false if { drop(x); true } => 1,
 LL |         true => {
 LL |             x;
    |             ^ value used here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |         false if { drop(x.clone()); true } => 1,
+   |                          ++++++++
 
 error: aborting due to 2 previous errors
 

src/test/ui/nll/ref-suggestion.stderr

@@ -7,6 +7,11 @@ LL |     let y = x;
    |             - value moved here
 LL |     x;
    |     ^ value used here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let y = x.clone();
+   |              ++++++++
 
 error[E0382]: use of moved value: `x`
   --> $DIR/ref-suggestion.rs:8:5
@@ -17,6 +22,11 @@ LL |     let mut y = x;
    |                 - value moved here
 LL |     x;
    |     ^ value used here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let mut y = x.clone();
+   |                  ++++++++
 
 error[E0382]: use of partially moved value: `x`
   --> $DIR/ref-suggestion.rs:16:5
@@ -28,7 +38,7 @@ LL |     x;
    |     ^ value used here after partial move
    |
    = note: partial move occurs because value has type `Vec<i32>`, which does not implement the `Copy` trait
-help: borrow this field in the pattern to avoid moving `x.0.0`
+help: borrow this binding in the pattern to avoid moving the value
    |
 LL |         (Some(ref y), ()) => {},
    |               +++

src/test/ui/pattern/bindings-after-at/bind-by-move-neither-can-live-while-the-other-survives-1.stderr

@@ -16,6 +16,11 @@ LL |         Some(_z @ ref _y) => {}
    |              |    value borrowed here after move
    |              value moved into `_z` here
    |              move occurs because `_z` has type `X` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         Some(ref _z @ ref _y) => {}
+   |              +++
 
 error: cannot move out of value because it is borrowed
   --> $DIR/bind-by-move-neither-can-live-while-the-other-survives-1.rs:26:14
@@ -35,6 +40,11 @@ LL |         Some(_z @ ref mut _y) => {}
    |              |    value borrowed here after move
    |              value moved into `_z` here
    |              move occurs because `_z` has type `X` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         Some(ref _z @ ref mut _y) => {}
+   |              +++
 
 error[E0382]: borrow of moved value
   --> $DIR/bind-by-move-neither-can-live-while-the-other-survives-1.rs:12:14
@@ -45,7 +55,7 @@ LL |         Some(ref _y @ _z) => {}
    |              value borrowed here after move
    |
    = note: move occurs because value has type `X`, which does not implement the `Copy` trait
-help: borrow this field in the pattern to avoid moving `x.0`
+help: borrow this binding in the pattern to avoid moving the value
    |
 LL |         Some(ref _y @ ref _z) => {}
    |                       +++
@@ -59,7 +69,7 @@ LL |         Some(ref mut _y @ _z) => {}
    |              value borrowed here after move
    |
    = note: move occurs because value has type `X`, which does not implement the `Copy` trait
-help: borrow this field in the pattern to avoid moving `x.0`
+help: borrow this binding in the pattern to avoid moving the value
    |
 LL |         Some(ref mut _y @ ref _z) => {}
    |                           +++

src/test/ui/pattern/bindings-after-at/borrowck-move-and-move.stderr

@@ -6,6 +6,11 @@ LL |     let a @ b = U;
    |         |   |
    |         |   value moved here
    |         value used here after move
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ ref b = U;
+   |         +++     +++
 
 error[E0382]: use of partially moved value
   --> $DIR/borrowck-move-and-move.rs:13:9
@@ -16,6 +21,10 @@ LL |     let a @ (b, c) = (U, U);
    |         value used here after partial move
    |
    = note: partial move occurs because value has type `U`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ (b, ref c) = (U, U);
+   |         +++         +++
 
 error[E0382]: use of partially moved value
   --> $DIR/borrowck-move-and-move.rs:15:9
@@ -26,6 +35,10 @@ LL |     let a @ (b, c) = (u(), u());
    |         value used here after partial move
    |
    = note: partial move occurs because value has type `U`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ (b, ref c) = (u(), u());
+   |         +++         +++
 
 error[E0382]: use of moved value
   --> $DIR/borrowck-move-and-move.rs:18:16
@@ -36,6 +49,11 @@ LL |         a @ Ok(b) | a @ Err(b) => {}
    |         -      ^ value used here after move
    |         |
    |         value moved here
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ref a @ Ok(b) | a @ Err(b) => {}
+   |         +++
 
 error[E0382]: use of moved value
   --> $DIR/borrowck-move-and-move.rs:18:29
@@ -46,6 +64,11 @@ LL |         a @ Ok(b) | a @ Err(b) => {}
    |                     -       ^ value used here after move
    |                     |
    |                     value moved here
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         a @ Ok(b) | ref a @ Err(b) => {}
+   |                     +++
 
 error[E0382]: use of partially moved value
   --> $DIR/borrowck-move-and-move.rs:25:9
@@ -56,6 +79,10 @@ LL |         xs @ [a, .., b] => {}
    |         value used here after partial move
    |
    = note: partial move occurs because value has type `U`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ref xs @ [a, .., ref b] => {}
+   |         +++              +++
 
 error[E0382]: use of partially moved value
   --> $DIR/borrowck-move-and-move.rs:29:9
@@ -66,6 +93,10 @@ LL |         xs @ [_, ys @ .., _] => {}
    |         value used here after partial move
    |
    = note: partial move occurs because value has type `U`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ref xs @ [_, ref ys @ .., _] => {}
+   |         +++          +++
 
 error[E0382]: use of moved value
   --> $DIR/borrowck-move-and-move.rs:22:12

src/test/ui/pattern/bindings-after-at/borrowck-pat-at-and-box.stderr

@@ -79,6 +79,10 @@ LL |     let ref a @ box b = Box::new(NC);
    |         value borrowed here after move
    |
    = note: move occurs because value has type `NC`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ box ref b = Box::new(NC);
+   |                     +++
 
 error[E0502]: cannot borrow value as immutable because it is also borrowed as mutable
   --> $DIR/borrowck-pat-at-and-box.rs:38:9

src/test/ui/pattern/bindings-after-at/borrowck-pat-by-move-and-ref-inverse-promotion.stderr

@@ -7,6 +7,11 @@ LL |     let a @ ref b = U;
    |         |   value borrowed here after move
    |         value moved into `a` here
    |         move occurs because `a` has type `U` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ ref b = U;
+   |         +++
 
 error: aborting due to previous error
 

src/test/ui/pattern/bindings-after-at/borrowck-pat-by-move-and-ref-inverse.stderr

@@ -7,6 +7,11 @@ LL |     let a @ ref b = U;
    |         |   value borrowed here after move
    |         value moved into `a` here
    |         move occurs because `a` has type `U` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ ref b = U;
+   |         +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:24:9
@@ -18,6 +23,11 @@ LL |     let a @ (mut b @ ref mut c, d @ ref e) = (U, U);
    |         |            value borrowed here after move
    |         value moved into `a` here
    |         move occurs because `a` has type `(U, U)` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ (mut b @ ref mut c, d @ ref e) = (U, U);
+   |         +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:24:14
@@ -28,6 +38,11 @@ LL |     let a @ (mut b @ ref mut c, d @ ref e) = (U, U);
    |              |       value borrowed here after move
    |              value moved into `b` here
    |              move occurs because `b` has type `U` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let a @ (ref mut b @ ref mut c, d @ ref e) = (U, U);
+   |              +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:24:33
@@ -38,6 +53,11 @@ LL |     let a @ (mut b @ ref mut c, d @ ref e) = (U, U);
    |                                 |   value borrowed here after move
    |                                 value moved into `d` here
    |                                 move occurs because `d` has type `U` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let a @ (mut b @ ref mut c, ref d @ ref e) = (U, U);
+   |                                 +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:29:9
@@ -49,6 +69,11 @@ LL |     let a @ [ref mut b, ref c] = [U, U];
    |         |    value borrowed here after move
    |         value moved into `a` here
    |         move occurs because `a` has type `[U; 2]` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ [ref mut b, ref c] = [U, U];
+   |         +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:31:9
@@ -59,6 +84,11 @@ LL |     let a @ ref b = u();
    |         |   value borrowed here after move
    |         value moved into `a` here
    |         move occurs because `a` has type `U` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ ref b = u();
+   |         +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:33:9
@@ -70,6 +100,11 @@ LL |     let a @ (mut b @ ref mut c, d @ ref e) = (u(), u());
    |         |            value borrowed here after move
    |         value moved into `a` here
    |         move occurs because `a` has type `(U, U)` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ (mut b @ ref mut c, d @ ref e) = (u(), u());
+   |         +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:33:14
@@ -80,6 +115,11 @@ LL |     let a @ (mut b @ ref mut c, d @ ref e) = (u(), u());
    |              |       value borrowed here after move
    |              value moved into `b` here
    |              move occurs because `b` has type `U` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let a @ (ref mut b @ ref mut c, d @ ref e) = (u(), u());
+   |              +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:33:33
@@ -90,6 +130,11 @@ LL |     let a @ (mut b @ ref mut c, d @ ref e) = (u(), u());
    |                                 |   value borrowed here after move
    |                                 value moved into `d` here
    |                                 move occurs because `d` has type `U` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let a @ (mut b @ ref mut c, ref d @ ref e) = (u(), u());
+   |                                 +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:38:9
@@ -101,6 +146,11 @@ LL |     let a @ [ref mut b, ref c] = [u(), u()];
    |         |    value borrowed here after move
    |         value moved into `a` here
    |         move occurs because `a` has type `[U; 2]` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ [ref mut b, ref c] = [u(), u()];
+   |         +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:42:9
@@ -111,6 +161,11 @@ LL |         a @ Some(ref b) => {}
    |         |        value borrowed here after move
    |         value moved into `a` here
    |         move occurs because `a` has type `Option<U>` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ref a @ Some(ref b) => {}
+   |         +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:47:9
@@ -122,6 +177,11 @@ LL |         a @ Some((mut b @ ref mut c, d @ ref e)) => {}
    |         |                 value borrowed here after move
    |         value moved into `a` here
    |         move occurs because `a` has type `Option<(U, U)>` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ref a @ Some((mut b @ ref mut c, d @ ref e)) => {}
+   |         +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:47:19
@@ -132,6 +192,11 @@ LL |         a @ Some((mut b @ ref mut c, d @ ref e)) => {}
    |                   |       value borrowed here after move
    |                   value moved into `b` here
    |                   move occurs because `b` has type `U` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         a @ Some((ref mut b @ ref mut c, d @ ref e)) => {}
+   |                   +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:47:38
@@ -142,6 +207,11 @@ LL |         a @ Some((mut b @ ref mut c, d @ ref e)) => {}
    |                                      |   value borrowed here after move
    |                                      value moved into `d` here
    |                                      move occurs because `d` has type `U` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         a @ Some((mut b @ ref mut c, ref d @ ref e)) => {}
+   |                                      +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:55:9
@@ -153,6 +223,11 @@ LL |         mut a @ Some([ref b, ref mut c]) => {}
    |         |             value borrowed here after move
    |         value moved into `a` here
    |         move occurs because `a` has type `Option<[U; 2]>` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ref mut a @ Some([ref b, ref mut c]) => {}
+   |         +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:61:9
@@ -163,6 +238,11 @@ LL |         a @ Some(ref b) => {}
    |         |        value borrowed here after move
    |         value moved into `a` here
    |         move occurs because `a` has type `Option<U>` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ref a @ Some(ref b) => {}
+   |         +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:67:9
@@ -174,6 +254,11 @@ LL |         a @ Some((mut b @ ref mut c, d @ ref e)) => {}
    |         |                 value borrowed here after move
    |         value moved into `a` here
    |         move occurs because `a` has type `Option<(U, U)>` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ref a @ Some((mut b @ ref mut c, d @ ref e)) => {}
+   |         +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:67:19
@@ -184,6 +269,11 @@ LL |         a @ Some((mut b @ ref mut c, d @ ref e)) => {}
    |                   |       value borrowed here after move
    |                   value moved into `b` here
    |                   move occurs because `b` has type `U` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         a @ Some((ref mut b @ ref mut c, d @ ref e)) => {}
+   |                   +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:67:38
@@ -194,6 +284,11 @@ LL |         a @ Some((mut b @ ref mut c, d @ ref e)) => {}
    |                                      |   value borrowed here after move
    |                                      value moved into `d` here
    |                                      move occurs because `d` has type `U` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         a @ Some((mut b @ ref mut c, ref d @ ref e)) => {}
+   |                                      +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:75:9
@@ -205,6 +300,11 @@ LL |         mut a @ Some([ref b, ref mut c]) => {}
    |         |             value borrowed here after move
    |         value moved into `a` here
    |         move occurs because `a` has type `Option<[U; 2]>` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ref mut a @ Some([ref b, ref mut c]) => {}
+   |         +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:11:11
@@ -215,6 +315,11 @@ LL |     fn f1(a @ ref b: U) {}
    |           |   value borrowed here after move
    |           value moved into `a` here
    |           move occurs because `a` has type `U` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     fn f1(ref a @ ref b: U) {}
+   |           +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:14:11
@@ -226,6 +331,11 @@ LL |     fn f2(mut a @ (b @ ref c, mut d @ ref e): (U, U)) {}
    |           |            value borrowed here after move
    |           value moved into `a` here
    |           move occurs because `a` has type `(U, U)` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     fn f2(ref mut a @ (b @ ref c, mut d @ ref e): (U, U)) {}
+   |           +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:14:20
@@ -236,6 +346,11 @@ LL |     fn f2(mut a @ (b @ ref c, mut d @ ref e): (U, U)) {}
    |                    |   value borrowed here after move
    |                    value moved into `b` here
    |                    move occurs because `b` has type `U` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     fn f2(mut a @ (ref b @ ref c, mut d @ ref e): (U, U)) {}
+   |                    +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:14:31
@@ -246,6 +361,11 @@ LL |     fn f2(mut a @ (b @ ref c, mut d @ ref e): (U, U)) {}
    |                               |       value borrowed here after move
    |                               value moved into `d` here
    |                               move occurs because `d` has type `U` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     fn f2(mut a @ (b @ ref c, ref mut d @ ref e): (U, U)) {}
+   |                               +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:19:11
@@ -257,6 +377,11 @@ LL |     fn f3(a @ [ref mut b, ref c]: [U; 2]) {}
    |           |    value borrowed here after move
    |           value moved into `a` here
    |           move occurs because `a` has type `[U; 2]` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     fn f3(ref a @ [ref mut b, ref c]: [U; 2]) {}
+   |           +++
 
 error[E0382]: use of partially moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:24:9
@@ -267,6 +392,10 @@ LL |     let a @ (mut b @ ref mut c, d @ ref e) = (U, U);
    |         value used here after partial move
    |
    = note: partial move occurs because value has type `U`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ (mut b @ ref mut c, ref d @ ref e) = (U, U);
+   |         +++                         +++
 
 error[E0382]: use of partially moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:33:9
@@ -277,6 +406,10 @@ LL |     let a @ (mut b @ ref mut c, d @ ref e) = (u(), u());
    |         value used here after partial move
    |
    = note: partial move occurs because value has type `U`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ (mut b @ ref mut c, ref d @ ref e) = (u(), u());
+   |         +++                         +++
 
 error[E0382]: use of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:47:38
@@ -285,6 +418,11 @@ LL |     match Some((U, U)) {
    |           ------------ move occurs because value has type `Option<(U, U)>`, which does not implement the `Copy` trait
 LL |         a @ Some((mut b @ ref mut c, d @ ref e)) => {}
    |         - value moved here           ^ value used here after move
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ref a @ Some((mut b @ ref mut c, d @ ref e)) => {}
+   |         +++
 
 error[E0382]: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:55:30
@@ -305,6 +443,11 @@ LL |         a @ Some(ref b) => {}
    |         -        ^^^^^ value borrowed here after move
    |         |
    |         value moved here
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ref a @ Some(ref b) => {}
+   |         +++
 
 error[E0382]: use of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:67:38
@@ -313,6 +456,11 @@ LL |     match Some((u(), u())) {
    |           ---------------- move occurs because value has type `Option<(U, U)>`, which does not implement the `Copy` trait
 LL |         a @ Some((mut b @ ref mut c, d @ ref e)) => {}
    |         - value moved here           ^ value used here after move
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         ref a @ Some((mut b @ ref mut c, d @ ref e)) => {}
+   |         +++
 
 error[E0382]: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref-inverse.rs:75:30

src/test/ui/pattern/bindings-after-at/borrowck-pat-by-move-and-ref.stderr

@@ -242,6 +242,10 @@ LL |     let ref mut a @ [b, mut c] = [U, U];
    |         value borrowed here after partial move
    |
    = note: partial move occurs because value has type `U`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref mut a @ [b, ref mut c] = [U, U];
+   |                         +++
 
 error[E0382]: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref.rs:33:9
@@ -251,6 +255,11 @@ LL |     let ref a @ b = u();
    |         |       |
    |         |       value moved here
    |         value borrowed here after move
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ ref b = u();
+   |                 +++
 
 error[E0382]: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref.rs:36:18
@@ -261,6 +270,10 @@ LL |     let ref a @ (ref b @ mut c, ref d @ e) = (u(), u());
    |                  value borrowed here after move
    |
    = note: move occurs because value has type `U`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ (ref b @ ref mut c, ref d @ e) = (u(), u());
+   |                          +++
 
 error[E0382]: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref.rs:36:33
@@ -271,6 +284,10 @@ LL |     let ref a @ (ref b @ mut c, ref d @ e) = (u(), u());
    |                                 value borrowed here after move
    |
    = note: move occurs because value has type `U`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ (ref b @ mut c, ref d @ ref e) = (u(), u());
+   |                                         +++
 
 error[E0382]: borrow of partially moved value
   --> $DIR/borrowck-pat-by-move-and-ref.rs:42:9
@@ -281,6 +298,10 @@ LL |     let ref mut a @ [b, mut c] = [u(), u()];
    |         value borrowed here after partial move
    |
    = note: partial move occurs because value has type `U`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref mut a @ [b, ref mut c] = [u(), u()];
+   |                         +++
 
 error[E0382]: borrow of moved value
   --> $DIR/borrowck-pat-by-move-and-ref.rs:69:23
@@ -291,7 +312,7 @@ LL |         ref a @ Some((ref b @ mut c, ref d @ e)) => {}
    |                       value borrowed here after move
    |
    = note: move occurs because value has type `U`, which does not implement the `Copy` trait
-help: borrow this field in the pattern to avoid moving the value
+help: borrow this binding in the pattern to avoid moving the value
    |
 LL |         ref a @ Some((ref b @ ref mut c, ref d @ e)) => {}
    |                               +++
@@ -305,7 +326,7 @@ LL |         ref a @ Some((ref b @ mut c, ref d @ e)) => {}
    |                                      value borrowed here after move
    |
    = note: move occurs because value has type `U`, which does not implement the `Copy` trait
-help: borrow this field in the pattern to avoid moving the value
+help: borrow this binding in the pattern to avoid moving the value
    |
 LL |         ref a @ Some((ref b @ mut c, ref d @ ref e)) => {}
    |                                              +++

src/test/ui/pattern/bindings-after-at/borrowck-pat-ref-mut-twice.stderr

@@ -97,6 +97,11 @@ LL |     let a @ (ref mut b, ref mut c) = (U, U);
    |         |    value borrowed here after move
    |         value moved into `a` here
    |         move occurs because `a` has type `(U, U)` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ (ref mut b, ref mut c) = (U, U);
+   |         +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-ref-mut-twice.rs:67:9
@@ -109,6 +114,11 @@ LL |     let a @ (b, [c, d]) = &mut val; // Same as ^--
    |         |    value borrowed here after move
    |         value moved into `a` here
    |         move occurs because `a` has type `&mut (U, [U; 2])` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ (b, [c, d]) = &mut val; // Same as ^--
+   |         +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-ref-mut-twice.rs:70:9
@@ -119,6 +129,11 @@ LL |     let a @ &mut ref mut b = &mut U;
    |         |        value borrowed here after move
    |         value moved into `a` here
    |         move occurs because `a` has type `&mut U` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ &mut ref mut b = &mut U;
+   |         +++
 
 error: borrow of moved value
   --> $DIR/borrowck-pat-ref-mut-twice.rs:72:9
@@ -130,6 +145,11 @@ LL |     let a @ &mut (ref mut b, ref mut c) = &mut (U, U);
    |         |         value borrowed here after move
    |         value moved into `a` here
    |         move occurs because `a` has type `&mut (U, U)` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ &mut (ref mut b, ref mut c) = &mut (U, U);
+   |         +++
 
 error: cannot borrow value as mutable more than once at a time
   --> $DIR/borrowck-pat-ref-mut-twice.rs:76:9

src/test/ui/pattern/bindings-after-at/copy-and-move-mixed.stderr

@@ -7,6 +7,10 @@ LL |     let a @ NC(b, c @ NC(d, e)) = NC(C, NC(C, C));
    |         value used here after partial move
    |
    = note: partial move occurs because value has type `NC<C, C>`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref a @ NC(b, ref c @ NC(d, e)) = NC(C, NC(C, C));
+   |         +++           +++
 
 error: aborting due to previous error
 

src/test/ui/pattern/bindings-after-at/default-binding-modes-both-sides-independent.stderr

@@ -34,6 +34,11 @@ LL |         Ok(ref a @ b) | Err(b @ ref a) => {
    |                             |   value borrowed here after move
    |                             value moved into `b` here
    |                             move occurs because `b` has type `NotCopy` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |         Ok(ref a @ b) | Err(ref b @ ref a) => {
+   |                             +++
 
 error: cannot move out of value because it is borrowed
   --> $DIR/default-binding-modes-both-sides-independent.rs:42:9
@@ -52,6 +57,11 @@ LL |     let ref mut a @ b = NotCopy;
    |         |           |
    |         |           value moved here
    |         value borrowed here after move
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref mut a @ ref b = NotCopy;
+   |                     +++
 
 error: aborting due to 6 previous errors
 

src/test/ui/pattern/move-ref-patterns/borrowck-move-ref-pattern.stderr

@@ -129,6 +129,10 @@ LL |     drop(tup.1);
    |          ^^^^^ value used here after move
    |
    = note: move occurs because `tup.1` has type `U`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let (ref _x0, ref _x1, ref _x2, ..) = tup;
+   |                   +++
 
 error[E0382]: borrow of moved value: `tup.1`
   --> $DIR/borrowck-move-ref-pattern.rs:29:20

src/test/ui/rfc-2361-dbg-macro/dbg-macro-move-semantics.stderr

@@ -7,6 +7,12 @@ LL |     let _ = dbg!(a);
    |             ------- value moved here
 LL |     let _ = dbg!(a);
    |                  ^ value used here after move
+   |
+help: borrow this binding in the pattern to avoid moving the value
+  --> $SRC_DIR/std/src/macros.rs:LL:COL
+   |
+LL |             ref tmp => {
+   |             +++
 
 error: aborting due to previous error
 

src/test/ui/suggestions/borrow-for-loop-head.stderr

@@ -12,6 +12,7 @@ error[E0382]: use of moved value: `a`
 LL |     let a = vec![1, 2, 3];
    |         - move occurs because `a` has type `Vec<i32>`, which does not implement the `Copy` trait
 LL |     for i in &a {
+   |     ----------- inside of this loop
 LL |         for j in a {
    |                  ^ `a` moved due to this implicit call to `.into_iter()`, in previous iteration of loop
    |

src/test/ui/suggestions/ref-pattern-binding.fixed

@@ -0,0 +1,19 @@
+// run-rustfix
+#![allow(unused)]
+
+struct S {
+    f: String,
+}
+
+fn main() {
+    let ref _moved @ ref _from = String::from("foo"); //~ ERROR
+    let ref _moved @ ref _from = String::from("foo"); //~ ERROR
+    let ref _moved @ ref _from = String::from("foo"); //~ ERROR
+    //~^ ERROR
+    let ref _moved @ ref _from = String::from("foo"); // ok
+    let ref _moved @ S { ref f } = S { f: String::from("foo") }; //~ ERROR
+    let ref _moved @ S { ref f } = S { f: String::from("foo") }; //~ ERROR
+    //~^ ERROR
+    let ref _moved @ S { ref f } = S { f: String::from("foo") }; // ok
+    let ref _moved @ S { ref f } = S { f: String::from("foo") }; //~ ERROR
+}

src/test/ui/suggestions/ref-pattern-binding.rs

@@ -0,0 +1,19 @@
+// run-rustfix
+#![allow(unused)]
+
+struct S {
+    f: String,
+}
+
+fn main() {
+    let _moved @ _from = String::from("foo"); //~ ERROR
+    let _moved @ ref _from = String::from("foo"); //~ ERROR
+    let ref _moved @ _from = String::from("foo"); //~ ERROR
+    //~^ ERROR
+    let ref _moved @ ref _from = String::from("foo"); // ok
+    let _moved @ S { f } = S { f: String::from("foo") }; //~ ERROR
+    let ref _moved @ S { f } = S { f: String::from("foo") }; //~ ERROR
+    //~^ ERROR
+    let ref _moved @ S { ref f } = S { f: String::from("foo") }; // ok
+    let _moved @ S { ref f } = S { f: String::from("foo") }; //~ ERROR
+}

src/test/ui/suggestions/ref-pattern-binding.stderr

@@ -0,0 +1,107 @@
+error: borrow of moved value
+  --> $DIR/ref-pattern-binding.rs:10:9
+   |
+LL |     let _moved @ ref _from = String::from("foo");
+   |         ------^^^---------
+   |         |        |
+   |         |        value borrowed here after move
+   |         value moved into `_moved` here
+   |         move occurs because `_moved` has type `String` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref _moved @ ref _from = String::from("foo");
+   |         +++
+
+error: cannot move out of value because it is borrowed
+  --> $DIR/ref-pattern-binding.rs:11:9
+   |
+LL |     let ref _moved @ _from = String::from("foo");
+   |         ----------^^^-----
+   |         |            |
+   |         |            value moved into `_from` here
+   |         value borrowed, by `_moved`, here
+
+error: cannot move out of value because it is borrowed
+  --> $DIR/ref-pattern-binding.rs:15:9
+   |
+LL |     let ref _moved @ S { f } = S { f: String::from("foo") };
+   |         ----------^^^^^^^-^^
+   |         |                |
+   |         |                value moved into `f` here
+   |         value borrowed, by `_moved`, here
+
+error: borrow of moved value
+  --> $DIR/ref-pattern-binding.rs:18:9
+   |
+LL |     let _moved @ S { ref f } = S { f: String::from("foo") };
+   |         ------^^^^^^^-----^^
+   |         |            |
+   |         |            value borrowed here after move
+   |         value moved into `_moved` here
+   |         move occurs because `_moved` has type `S` which does not implement the `Copy` trait
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref _moved @ S { ref f } = S { f: String::from("foo") };
+   |         +++
+
+error[E0382]: use of moved value
+  --> $DIR/ref-pattern-binding.rs:9:9
+   |
+LL |     let _moved @ _from = String::from("foo");
+   |         ^^^^^^   -----   ------------------- move occurs because value has type `String`, which does not implement the `Copy` trait
+   |         |        |
+   |         |        value moved here
+   |         value used here after move
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref _moved @ ref _from = String::from("foo");
+   |         +++          +++
+
+error[E0382]: borrow of moved value
+  --> $DIR/ref-pattern-binding.rs:11:9
+   |
+LL |     let ref _moved @ _from = String::from("foo");
+   |         ^^^^^^^^^^   -----   ------------------- move occurs because value has type `String`, which does not implement the `Copy` trait
+   |         |            |
+   |         |            value moved here
+   |         value borrowed here after move
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref _moved @ ref _from = String::from("foo");
+   |                      +++
+
+error[E0382]: use of partially moved value
+  --> $DIR/ref-pattern-binding.rs:14:9
+   |
+LL |     let _moved @ S { f } = S { f: String::from("foo") };
+   |         ^^^^^^       - value partially moved here
+   |         |
+   |         value used here after partial move
+   |
+   = note: partial move occurs because value has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref _moved @ S { ref f } = S { f: String::from("foo") };
+   |         +++              +++
+
+error[E0382]: borrow of partially moved value
+  --> $DIR/ref-pattern-binding.rs:15:9
+   |
+LL |     let ref _moved @ S { f } = S { f: String::from("foo") };
+   |         ^^^^^^^^^^       - value partially moved here
+   |         |
+   |         value borrowed here after partial move
+   |
+   = note: partial move occurs because value has type `String`, which does not implement the `Copy` trait
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref _moved @ S { ref f } = S { f: String::from("foo") };
+   |                          +++
+
+error: aborting due to 8 previous errors
+
+For more information about this error, try `rustc --explain E0382`.

src/test/ui/track-diagnostics/track2.stderr

@@ -7,6 +7,11 @@ LL |     let _moved @ _from = String::from("foo");
    |         |        value moved here
    |         value used here after move
 -Ztrack-diagnostics: created at compiler/rustc_borrowck/src/borrowck_errors.rs:LL:CC
+   |
+help: borrow this binding in the pattern to avoid moving the value
+   |
+LL |     let ref _moved @ ref _from = String::from("foo");
+   |         +++          +++
 
 error: aborting due to previous error
 

src/test/ui/try-block/try-block-maybe-bad-lifetime.stderr

@@ -23,6 +23,10 @@ LL |         println!("{}", x);
    |                        ^ value borrowed here after move
    |
    = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |             ::std::mem::drop(x.clone());
+   |                               ++++++++
 
 error[E0506]: cannot assign to `i` because it is borrowed
   --> $DIR/try-block-maybe-bad-lifetime.rs:40:9

src/test/ui/union/union-move.mirunsafeck.stderr

@@ -8,6 +8,14 @@ LL |         move_out(x.f1_nocopy);
    |                  ----------- value moved here
 LL |         move_out(x.f2_nocopy);
    |                  ^^^^^^^^^^^ value used here after move
+   |
+note: consider changing this parameter type in function `move_out` to borrow instead if owning the value isn't necessary
+  --> $DIR/union-move.rs:10:19
+   |
+LL | fn move_out<T>(x: T) {}
+   |    --------       ^ this parameter takes ownership of the value
+   |    |
+   |    in this function
 
 error[E0382]: use of moved value: `x`
   --> $DIR/union-move.rs:45:18
@@ -19,6 +27,14 @@ LL |         move_out(x.f2_nocopy);
    |                  ----------- value moved here
 LL |         move_out(x.f3_copy);
    |                  ^^^^^^^^^ value used here after move
+   |
+note: consider changing this parameter type in function `move_out` to borrow instead if owning the value isn't necessary
+  --> $DIR/union-move.rs:10:19
+   |
+LL | fn move_out<T>(x: T) {}
+   |    --------       ^ this parameter takes ownership of the value
+   |    |
+   |    in this function
 
 error[E0509]: cannot move out of type `U2`, which implements the `Drop` trait
   --> $DIR/union-move.rs:52:18

src/test/ui/union/union-move.thirunsafeck.stderr

@@ -8,6 +8,14 @@ LL |         move_out(x.f1_nocopy);
    |                  ----------- value moved here
 LL |         move_out(x.f2_nocopy);
    |                  ^^^^^^^^^^^ value used here after move
+   |
+note: consider changing this parameter type in function `move_out` to borrow instead if owning the value isn't necessary
+  --> $DIR/union-move.rs:10:19
+   |
+LL | fn move_out<T>(x: T) {}
+   |    --------       ^ this parameter takes ownership of the value
+   |    |
+   |    in this function
 
 error[E0382]: use of moved value: `x`
   --> $DIR/union-move.rs:45:18
@@ -19,6 +27,14 @@ LL |         move_out(x.f2_nocopy);
    |                  ----------- value moved here
 LL |         move_out(x.f3_copy);
    |                  ^^^^^^^^^ value used here after move
+   |
+note: consider changing this parameter type in function `move_out` to borrow instead if owning the value isn't necessary
+  --> $DIR/union-move.rs:10:19
+   |
+LL | fn move_out<T>(x: T) {}
+   |    --------       ^ this parameter takes ownership of the value
+   |    |
+   |    in this function
 
 error[E0509]: cannot move out of type `U2`, which implements the `Drop` trait
   --> $DIR/union-move.rs:52:18

src/test/ui/unop-move-semantics.stderr

@@ -14,6 +14,10 @@ note: calling this operator moves the left-hand side
    |
 LL |     fn not(self) -> Self::Output;
    |            ^^^^
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     !x.clone();
+   |       ++++++++
 help: consider further restricting this bound
    |
 LL | fn move_then_borrow<T: Not<Output=T> + Clone + Copy>(x: T) {

src/test/ui/unsized-locals/borrow-after-move.stderr

@@ -28,6 +28,14 @@ LL |         drop_unsized(y);
 ...
 LL |         println!("{}", &y);
    |                        ^^ value borrowed here after move
+   |
+note: consider changing this parameter type in function `drop_unsized` to borrow instead if owning the value isn't necessary
+  --> $DIR/borrow-after-move.rs:14:31
+   |
+LL | fn drop_unsized<T: ?Sized>(_: T) {}
+   |    ------------               ^ this parameter takes ownership of the value
+   |    |
+   |    in this function
 
 error[E0382]: borrow of moved value: `x`
   --> $DIR/borrow-after-move.rs:31:24
@@ -66,6 +74,11 @@ LL |         x.foo();
    |         - value moved here
 LL |         println!("{}", &x);
    |                        ^^ value borrowed here after move
+   |
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |         x.clone().foo();
+   |          ++++++++
 
 error: aborting due to 5 previous errors; 1 warning emitted
 

src/test/ui/unsized-locals/double-move.stderr

@@ -16,6 +16,14 @@ LL |         drop_unsized(y);
    |                      - value moved here
 LL |         drop_unsized(y);
    |                      ^ value used here after move
+   |
+note: consider changing this parameter type in function `drop_unsized` to borrow instead if owning the value isn't necessary
+  --> $DIR/double-move.rs:14:31
+   |
+LL | fn drop_unsized<T: ?Sized>(_: T) {}
+   |    ------------               ^ this parameter takes ownership of the value
+   |    |
+   |    in this function
 
 error[E0382]: use of moved value: `x`
   --> $DIR/double-move.rs:27:22

src/test/ui/use/use-after-move-based-on-type.stderr

@@ -9,6 +9,10 @@ LL |     println!("{}", x);
    |                    ^ value borrowed here after move
    |
    = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider cloning the value if the performance cost is acceptable
+   |
+LL |     let _y = x.clone();
+   |               ++++++++
 
 error: aborting due to previous error
 

src/test/ui/use/use-after-move-implicity-coerced-object.stderr

@@ -9,6 +9,14 @@ LL |     l.push(n);
 LL |
 LL |     let x = n.to_string();
    |             ^^^^^^^^^^^^^ value borrowed here after move
+   |
+note: consider changing this parameter type in method `push` to borrow instead if owning the value isn't necessary
+  --> $DIR/use-after-move-implicity-coerced-object.rs:17:27
+   |
+LL |     fn push(&mut self, n: Box<dyn ToString + 'static>) {
+   |        ----               ^^^^^^^^^^^^^^^^^^^^^^^^^^^ this parameter takes ownership of the value
+   |        |
+   |        in this method
 
 error: aborting due to previous error
 

src/tools/clippy/clippy_lints/src/suspicious_operation_groupings.rs

@@ -582,7 +582,7 @@ fn ident_difference_expr_with_base_location(
         | (Block(_, _), Block(_, _))
         | (Closure(_), Closure(_))
         | (Match(_, _), Match(_, _))
-        | (Loop(_, _), Loop(_, _))
+        | (Loop(_, _, _), Loop(_, _, _))
         | (ForLoop(_, _, _, _), ForLoop(_, _, _, _))
         | (While(_, _, _), While(_, _, _))
         | (If(_, _, _), If(_, _, _))

src/tools/clippy/clippy_utils/src/ast_utils.rs

@@ -171,7 +171,7 @@ pub fn eq_expr(l: &Expr, r: &Expr) -> bool {
         (ForLoop(lp, li, lt, ll), ForLoop(rp, ri, rt, rl)) => {
             eq_label(ll, rl) && eq_pat(lp, rp) && eq_expr(li, ri) && eq_block(lt, rt)
         },
-        (Loop(lt, ll), Loop(rt, rl)) => eq_label(ll, rl) && eq_block(lt, rt),
+        (Loop(lt, ll, _), Loop(rt, rl, _)) => eq_label(ll, rl) && eq_block(lt, rt),
         (Block(lb, ll), Block(rb, rl)) => eq_label(ll, rl) && eq_block(lb, rb),
         (TryBlock(l), TryBlock(r)) => eq_block(l, r),
         (Yield(l), Yield(r)) | (Ret(l), Ret(r)) => eq_expr_opt(l, r),

src/tools/rustfmt/src/expr.rs

@@ -660,7 +660,7 @@ fn to_control_flow(expr: &ast::Expr, expr_type: ExprType) -> Option<ControlFlow<
         ast::ExprKind::ForLoop(ref pat, ref cond, ref block, label) => {
             Some(ControlFlow::new_for(pat, cond, block, label, expr.span))
         }
-        ast::ExprKind::Loop(ref block, label) => {
+        ast::ExprKind::Loop(ref block, label, _) => {
             Some(ControlFlow::new_loop(block, label, expr.span))
         }
         ast::ExprKind::While(ref cond, ref block, label) => {