Auto merge of #107767 - matthiaskrgr:rollup-9m1qfso, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - #100599 (Add compiler error E0523 long description and test)
 - #107471 (rustdoc: do not include empty default-settings tag in HTML)
 - #107555 (Modify existing bounds if they exist)
 - #107662 (Turn projections into copies in CopyProp.)
 - #107695 (Add test for Future inflating arg size to 3x )
 - #107700 (Run the tools builder on all PRs)
 - #107706 (Mark 'atomic_mut_ptr' methods const)
 - #107709 (Fix problem noticed in PR106859 with char -> u8 suggestion)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

.github/workflows/ci.yml

@@ -60,9 +60,8 @@ jobs:
             env: {}
           - name: x86_64-gnu-tools
             tidy: false
-            env:
-              CI_ONLY_WHEN_SUBMODULES_CHANGED: 1
             os: ubuntu-20.04-xl
+            env: {}
     timeout-minutes: 600
     runs-on: "${{ matrix.os }}"
     steps:

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -803,6 +803,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                 predicates
                     .iter()
                     .map(|(param, constraint)| (param.name.as_str(), &**constraint, None)),
+                None,
             );
         }
     }

compiler/rustc_const_eval/src/transform/check_consts/ops.rs

@@ -136,6 +136,7 @@ impl<'tcx> NonConstOp<'tcx> for FnCallNonConst<'tcx> {
                             &param_ty.name.as_str(),
                             &constraint,
                             None,
+                            None,
                         );
                     }
                 }

compiler/rustc_error_codes/src/error_codes.rs

@@ -286,6 +286,7 @@ E0519: include_str!("./error_codes/E0519.md"),
 E0520: include_str!("./error_codes/E0520.md"),
 E0521: include_str!("./error_codes/E0521.md"),
 E0522: include_str!("./error_codes/E0522.md"),
+E0523: include_str!("./error_codes/E0523.md"),
 E0524: include_str!("./error_codes/E0524.md"),
 E0525: include_str!("./error_codes/E0525.md"),
 E0527: include_str!("./error_codes/E0527.md"),
@@ -622,7 +623,6 @@ E0793: include_str!("./error_codes/E0793.md"),
 //  E0488, // lifetime of variable does not enclose its declaration
 //  E0489, // type/lifetime parameter not in scope here
 //  E0490, // removed: unreachable
-    E0523, // two dependencies have same (crate-name, disambiguator) but different SVH
 //  E0526, // shuffle indices are not constant
 //  E0540, // multiple rustc_deprecated attributes
 //  E0548, // replaced with a generic attribute input check

compiler/rustc_error_codes/src/error_codes/E0464.md

@@ -1,6 +1,21 @@
 The compiler found multiple library files with the requested crate name.
 
+```compile_fail
+// aux-build:crateresolve-1.rs
+// aux-build:crateresolve-2.rs
+// aux-build:crateresolve-3.rs
+
+extern crate crateresolve;
+//~^ ERROR multiple candidates for `rlib` dependency `crateresolve` found
+
+fn main() {}
+```
+
 This error can occur in several different cases -- for example, when using
 `extern crate` or passing `--extern` options without crate paths. It can also be
 caused by caching issues with the build directory, in which case `cargo clean`
 may help.
+
+In the above example, there are three different library files, all of which
+define the same crate name. Without providing a full path, there is no way for
+the compiler to know which crate it should use.

compiler/rustc_error_codes/src/error_codes/E0523.md

@@ -0,0 +1,25 @@
+#### Note: this error code is no longer emitted by the compiler.
+
+The compiler found multiple library files with the requested crate name.
+
+```compile_fail
+// aux-build:crateresolve-1.rs
+// aux-build:crateresolve-2.rs
+// aux-build:crateresolve-3.rs
+
+extern crate crateresolve;
+//~^ ERROR multiple candidates for `rlib` dependency `crateresolve` found
+
+fn main() {}
+```
+
+This error can occur in several different cases -- for example, when using
+`extern crate` or passing `--extern` options without crate paths. It can also be
+caused by caching issues with the build directory, in which case `cargo clean`
+may help.
+
+In the above example, there are three different library files, all of which
+define the same crate name. Without providing a full path, there is no way for
+the compiler to know which crate it should use.
+
+*Note that E0523 has been merged into E0464.*

compiler/rustc_hir_analysis/src/coherence/builtin.rs

@@ -176,6 +176,7 @@ fn visit_implementation_of_copy(tcx: TyCtxt<'_>, impl_did: LocalDefId) {
                 bounds.iter().map(|(param, constraint, def_id)| {
                     (param.as_str(), constraint.as_str(), *def_id)
                 }),
+                None,
             );
             err.emit();
         }

compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs

@@ -1457,6 +1457,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     generics,
                     diag,
                     vec![(param.name.as_str(), "Clone", Some(clone_trait_did))].into_iter(),
+                    None,
                 );
             } else {
                 self.suggest_derive(diag, &[(trait_ref.to_predicate(self.tcx), None, None)]);

compiler/rustc_infer/src/infer/error_reporting/mod.rs

@@ -1922,7 +1922,8 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
                         (ty::Uint(ty::UintTy::U8), ty::Char) => {
                             if let Ok(code) = self.tcx.sess().source_map().span_to_snippet(span)
                                 && let Some(code) = code.strip_prefix('\'').and_then(|s| s.strip_suffix('\''))
-                                && code.chars().next().map_or(false, |c| c.is_ascii())
+                                && !code.starts_with("\\u") // forbid all Unicode escapes
+                                && code.chars().next().map_or(false, |c| c.is_ascii()) // forbids literal Unicode characters beyond ASCII
                             {
                                 err.span_suggestion(
                                     span,

compiler/rustc_infer/src/infer/error_reporting/note_and_explain.rs

@@ -77,49 +77,86 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
                     (ty::Param(p), ty::Alias(ty::Projection, proj)) | (ty::Alias(ty::Projection, proj), ty::Param(p))
                         if tcx.def_kind(proj.def_id) != DefKind::ImplTraitPlaceholder =>
                     {
-                        let generics = tcx.generics_of(body_owner_def_id);
-                        let p_span = tcx.def_span(generics.type_param(p, tcx).def_id);
+                        let p_def_id = tcx
+                            .generics_of(body_owner_def_id)
+                            .type_param(p, tcx)
+                            .def_id;
+                        let p_span = tcx.def_span(p_def_id);
                         if !sp.contains(p_span) {
                             diag.span_label(p_span, "this type parameter");
                         }
                         let hir = tcx.hir();
                         let mut note = true;
-                        if let Some(generics) = generics
-                            .type_param(p, tcx)
-                            .def_id
+                        let parent = p_def_id
                             .as_local()
-                            .map(|id| hir.local_def_id_to_hir_id(id))
-                            .and_then(|id| tcx.hir().find_parent(id))
-                            .as_ref()
-                            .and_then(|node| node.generics())
+                            .and_then(|id| {
+                                let local_id = hir.local_def_id_to_hir_id(id);
+                                let generics = tcx.hir().find_parent(local_id)?.generics()?;
+                                Some((id, generics))
+                            });
+                        if let Some((local_id, generics)) = parent
                         {
                             // Synthesize the associated type restriction `Add<Output = Expected>`.
                             // FIXME: extract this logic for use in other diagnostics.
                             let (trait_ref, assoc_substs) = proj.trait_ref_and_own_substs(tcx);
-                            let path =
-                                tcx.def_path_str_with_substs(trait_ref.def_id, trait_ref.substs);
                             let item_name = tcx.item_name(proj.def_id);
                             let item_args = self.format_generic_args(assoc_substs);
 
-                            let path = if path.ends_with('>') {
-                                format!(
-                                    "{}, {}{} = {}>",
-                                    &path[..path.len() - 1],
-                                    item_name,
-                                    item_args,
-                                    p
-                                )
+                            // Here, we try to see if there's an existing
+                            // trait implementation that matches the one that
+                            // we're suggesting to restrict. If so, find the
+                            // "end", whether it be at the end of the trait
+                            // or the end of the generic arguments.
+                            let mut matching_span = None;
+                            let mut matched_end_of_args = false;
+                            for bound in generics.bounds_for_param(local_id) {
+                                let potential_spans = bound
+                                    .bounds
+                                    .iter()
+                                    .find_map(|bound| {
+                                        let bound_trait_path = bound.trait_ref()?.path;
+                                        let def_id = bound_trait_path.res.opt_def_id()?;
+                                        let generic_args = bound_trait_path.segments.iter().last().map(|path| path.args());
+                                        (def_id == trait_ref.def_id).then_some((bound_trait_path.span, generic_args))
+                                    });
+
+                                if let Some((end_of_trait, end_of_args)) = potential_spans {
+                                    let args_span = end_of_args.and_then(|args| args.span());
+                                    matched_end_of_args = args_span.is_some();
+                                    matching_span = args_span
+                                        .or_else(|| Some(end_of_trait))
+                                        .map(|span| span.shrink_to_hi());
+                                    break;
+                                }
+                            }
+
+                            if matched_end_of_args {
+                                // Append suggestion to the end of our args
+                                let path = format!(", {}{} = {}",item_name, item_args, p);
+                                note = !suggest_constraining_type_param(
+                                    tcx,
+                                    generics,
+                                    diag,
+                                    &format!("{}", proj.self_ty()),
+                                    &path,
+                                    None,
+                                    matching_span,
+                                );
                             } else {
-                                format!("{}<{}{} = {}>", path, item_name, item_args, p)
-                            };
-                            note = !suggest_constraining_type_param(
-                                tcx,
-                                generics,
-                                diag,
-                                &format!("{}", proj.self_ty()),
-                                &path,
-                                None,
-                            );
+                                // Suggest adding a bound to an existing trait
+                                // or if the trait doesn't exist, add the trait
+                                // and the suggested bounds.
+                                let path = format!("<{}{} = {}>", item_name, item_args, p);
+                                note = !suggest_constraining_type_param(
+                                    tcx,
+                                    generics,
+                                    diag,
+                                    &format!("{}", proj.self_ty()),
+                                    &path,
+                                    None,
+                                    matching_span,
+                                );
+                            }
                         }
                         if note {
                             diag.note("you might be missing a type parameter or trait bound");

compiler/rustc_metadata/src/creader.rs

@@ -356,7 +356,12 @@ impl<'a> CrateLoader<'a> {
         for (_, other) in self.cstore.iter_crate_data() {
             // Same stable crate id but different SVH
             if other.stable_crate_id() == root.stable_crate_id() && other.hash() != root.hash() {
-                return Err(CrateError::SymbolConflictsOthers(root.name()));
+                bug!(
+                    "Previously returned E0523 here. \
+                     See https://github.com/rust-lang/rust/pull/100599 for additional discussion.\
+                     root.name() = {}.",
+                    root.name()
+                );
             }
         }
 

compiler/rustc_metadata/src/errors.rs

@@ -511,14 +511,6 @@ pub struct SymbolConflictsCurrent {
     pub crate_name: Symbol,
 }
 
-#[derive(Diagnostic)]
-#[diag(metadata_symbol_conflicts_others, code = "E0523")]
-pub struct SymbolConflictsOthers {
-    #[primary_span]
-    pub span: Span,
-    pub crate_name: Symbol,
-}
-
 #[derive(Diagnostic)]
 #[diag(metadata_stable_crate_id_collision)]
 pub struct StableCrateIdCollision {

compiler/rustc_metadata/src/locator.rs

@@ -945,7 +945,6 @@ pub(crate) enum CrateError {
     ExternLocationNotFile(Symbol, PathBuf),
     MultipleCandidates(Symbol, CrateFlavor, Vec<PathBuf>),
     SymbolConflictsCurrent(Symbol),
-    SymbolConflictsOthers(Symbol),
     StableCrateIdCollision(Symbol, Symbol),
     DlOpen(String),
     DlSym(String),
@@ -989,9 +988,6 @@ impl CrateError {
             CrateError::SymbolConflictsCurrent(root_name) => {
                 sess.emit_err(errors::SymbolConflictsCurrent { span, crate_name: root_name });
             }
-            CrateError::SymbolConflictsOthers(root_name) => {
-                sess.emit_err(errors::SymbolConflictsOthers { span, crate_name: root_name });
-            }
             CrateError::StableCrateIdCollision(crate_name0, crate_name1) => {
                 sess.emit_err(errors::StableCrateIdCollision { span, crate_name0, crate_name1 });
             }

compiler/rustc_middle/src/ty/diagnostics.rs

@@ -193,6 +193,9 @@ fn suggest_removing_unsized_bound(
 }
 
 /// Suggest restricting a type param with a new bound.
+///
+/// If `span_to_replace` is provided, then that span will be replaced with the
+/// `constraint`. If one wasn't provided, then the full bound will be suggested.
 pub fn suggest_constraining_type_param(
     tcx: TyCtxt<'_>,
     generics: &hir::Generics<'_>,
@@ -200,12 +203,14 @@ pub fn suggest_constraining_type_param(
     param_name: &str,
     constraint: &str,
     def_id: Option<DefId>,
+    span_to_replace: Option<Span>,
 ) -> bool {
     suggest_constraining_type_params(
         tcx,
         generics,
         err,
         [(param_name, constraint, def_id)].into_iter(),
+        span_to_replace,
     )
 }
 
@@ -215,6 +220,7 @@ pub fn suggest_constraining_type_params<'a>(
     generics: &hir::Generics<'_>,
     err: &mut Diagnostic,
     param_names_and_constraints: impl Iterator<Item = (&'a str, &'a str, Option<DefId>)>,
+    span_to_replace: Option<Span>,
 ) -> bool {
     let mut grouped = FxHashMap::default();
     param_names_and_constraints.for_each(|(param_name, constraint, def_id)| {
@@ -253,7 +259,9 @@ pub fn suggest_constraining_type_params<'a>(
         let mut suggest_restrict = |span, bound_list_non_empty| {
             suggestions.push((
                 span,
-                if bound_list_non_empty {
+                if span_to_replace.is_some() {
+                    constraint.clone()
+                } else if bound_list_non_empty {
                     format!(" + {}", constraint)
                 } else {
                     format!(" {}", constraint)
@@ -262,6 +270,11 @@ pub fn suggest_constraining_type_params<'a>(
             ))
         };
 
+        if let Some(span) = span_to_replace {
+            suggest_restrict(span, true);
+            continue;
+        }
+
         // When the type parameter has been provided bounds
         //
         //    Message:

compiler/rustc_mir_transform/src/copy_prop.rs

@@ -153,8 +153,9 @@ impl<'tcx> MutVisitor<'tcx> for Replacer<'_, 'tcx> {
 
     fn visit_operand(&mut self, operand: &mut Operand<'tcx>, loc: Location) {
         if let Operand::Move(place) = *operand
-            && let Some(local) = place.as_local()
-            && !self.fully_moved.contains(local)
+            // A move out of a projection of a copy is equivalent to a copy of the original projection.
+            && !place.has_deref()
+            && !self.fully_moved.contains(place.local)
         {
             *operand = Operand::Copy(place);
         }

compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs

@@ -679,6 +679,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                         &param_name,
                         &constraint,
                         Some(trait_pred.def_id()),
+                        None,
                     ) {
                         return;
                     }
@@ -1087,6 +1088,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                     param.name.as_str(),
                     "Clone",
                     Some(clone_trait),
+                    None,
                 );
             }
             err.span_suggestion_verbose(

library/core/src/sync/atomic.rs

@@ -928,8 +928,8 @@ impl AtomicBool {
     /// ```
     #[inline]
     #[unstable(feature = "atomic_mut_ptr", reason = "recently added", issue = "66893")]
-    pub fn as_mut_ptr(&self) -> *mut bool {
-        self.v.get() as *mut bool
+    pub const fn as_mut_ptr(&self) -> *mut bool {
+        self.v.get().cast()
     }
 
     /// Fetches the value, and applies a function to it that returns an optional
@@ -1803,7 +1803,7 @@ impl<T> AtomicPtr<T> {
     ///
     /// ```ignore (extern-declaration)
     /// #![feature(atomic_mut_ptr)]
-    //// use std::sync::atomic::AtomicPtr;
+    /// use std::sync::atomic::AtomicPtr;
     ///
     /// extern "C" {
     ///     fn my_atomic_op(arg: *mut *mut u32);
@@ -1819,7 +1819,7 @@ impl<T> AtomicPtr<T> {
     /// ```
     #[inline]
     #[unstable(feature = "atomic_mut_ptr", reason = "recently added", issue = "66893")]
-    pub fn as_mut_ptr(&self) -> *mut *mut T {
+    pub const fn as_mut_ptr(&self) -> *mut *mut T {
         self.p.get()
     }
 }
@@ -2727,7 +2727,7 @@ macro_rules! atomic_int {
             #[unstable(feature = "atomic_mut_ptr",
                    reason = "recently added",
                    issue = "66893")]
-            pub fn as_mut_ptr(&self) -> *mut $int_type {
+            pub const fn as_mut_ptr(&self) -> *mut $int_type {
                 self.v.get()
             }
         }

src/ci/github-actions/ci.yml

@@ -307,8 +307,6 @@ jobs:
           - name: x86_64-gnu-tools
             <<: *job-linux-xl
             tidy: false
-            env:
-              CI_ONLY_WHEN_SUBMODULES_CHANGED: 1
 
   auto:
     permissions:

src/ci/scripts/should-skip-this.sh

@@ -1,46 +1,11 @@
 #!/bin/bash
-# Set the SKIP_JOB environment variable if this job is supposed to only run
-# when submodules are updated and they were not. The following time consuming
-# tasks will be skipped when the environment variable is present.
+# Set the SKIP_JOB environment variable if this job is not supposed to run on the current builder.
 
 set -euo pipefail
 IFS=$'\n\t'
 
 source "$(cd "$(dirname "$0")" && pwd)/../shared.sh"
 
-if [[ -n "${CI_ONLY_WHEN_SUBMODULES_CHANGED-}" ]]; then
-    git fetch "https://github.com/$GITHUB_REPOSITORY" "$GITHUB_BASE_REF"
-    BASE_COMMIT="$(git merge-base FETCH_HEAD HEAD)"
-
-    echo "Searching for toolstate changes between $BASE_COMMIT and $(git rev-parse HEAD)"
-
-    if git diff "$BASE_COMMIT" | grep --quiet "^index .* 160000"; then
-        # Submodules pseudo-files inside git have the 160000 permissions, so when
-        # those files are present in the diff a submodule was updated.
-        echo "Submodules were updated"
-    elif ! (git diff --quiet "$BASE_COMMIT" -- \
-             src/tools/clippy src/tools/rustfmt src/tools/miri \
-             library/std/src/sys); then
-        # There is not an easy blanket search for subtrees. For now, manually list
-        # the subtrees.
-        # Also run this when the platform-specific parts of std change, in case
-        # that breaks Miri.
-        echo "Tool subtrees were updated"
-    elif ! (git diff --quiet "$BASE_COMMIT" -- \
-             tests/rustdoc-gui \
-             src/librustdoc \
-             src/ci/docker/host-x86_64/x86_64-gnu-tools/Dockerfile \
-             src/ci/docker/host-x86_64/x86_64-gnu-tools/browser-ui-test.version \
-             src/tools/rustdoc-gui); then
-        # There was a change in either rustdoc or in its GUI tests.
-        echo "Rustdoc was updated"
-    else
-        echo "Not executing this job since no submodules nor subtrees were updated"
-        ciCommandSetEnv SKIP_JOB 1
-        exit 0
-    fi
-fi
-
 if [[ -n "${CI_ONLY_WHEN_CHANNEL-}" ]]; then
     if [[ "${CI_ONLY_WHEN_CHANNEL}" = "$(cat src/ci/channel)" ]]; then
         echo "The channel is the expected one"

src/librustdoc/html/templates/page.html

@@ -23,11 +23,13 @@
     {%- for theme in themes -%}
         <link rel="stylesheet" disabled href="{{page.root_path|safe}}{{theme}}{{page.resource_suffix}}.css"> {#- -#}
     {%- endfor -%}
+    {%- if !layout.default_settings.is_empty() -%}
     <script id="default-settings" {# -#}
       {% for (k, v) in layout.default_settings %}
         data-{{k}}="{{v}}"
       {%- endfor -%}
     ></script> {#- -#}
+    {%- endif -%}
     <script src="{{static_root_path|safe}}{{files.storage_js}}"></script> {#- -#}
     {%- if page.css_class.contains("crate") -%}
     <script defer src="{{page.root_path|safe}}crates{{page.resource_suffix}}.js"></script> {#- -#}

src/tools/tidy/src/error_codes.rs

@@ -31,7 +31,7 @@ const IGNORE_DOCTEST_CHECK: &[&str] = &["E0464", "E0570", "E0601", "E0602", "E06
 
 // Error codes that don't yet have a UI test. This list will eventually be removed.
 const IGNORE_UI_TEST_CHECK: &[&str] =
-    &["E0461", "E0465", "E0476", "E0514", "E0523", "E0554", "E0640", "E0717", "E0729"];
+    &["E0461", "E0465", "E0476", "E0514", "E0554", "E0640", "E0717", "E0729"];
 
 macro_rules! verbose_print {
     ($verbose:expr, $($fmt:tt)*) => {

tests/mir-opt/copy-prop/move_projection.f.CopyProp.diff

@@ -0,0 +1,31 @@
+- // MIR for `f` before CopyProp
++ // MIR for `f` after CopyProp
+  
+  fn f(_1: Foo) -> bool {
+      let mut _0: bool;                    // return place in scope 0 at $DIR/move_projection.rs:+0:17: +0:21
+      let mut _2: Foo;                     // in scope 0 at $SRC_DIR/core/src/intrinsics/mir.rs:LL:COL
+      let mut _3: u8;                      // in scope 0 at $SRC_DIR/core/src/intrinsics/mir.rs:LL:COL
+  
+      bb0: {
+-         _2 = _1;                         // scope 0 at $SRC_DIR/core/src/intrinsics/mir.rs:LL:COL
+-         _3 = move (_2.0: u8);            // scope 0 at $SRC_DIR/core/src/intrinsics/mir.rs:LL:COL
+-         _0 = opaque::<Foo>(move _1) -> bb1; // scope 0 at $DIR/move_projection.rs:+6:13: +6:44
++         _3 = (_1.0: u8);                 // scope 0 at $SRC_DIR/core/src/intrinsics/mir.rs:LL:COL
++         _0 = opaque::<Foo>(_1) -> bb1;   // scope 0 at $DIR/move_projection.rs:+6:13: +6:44
+                                           // mir::Constant
+                                           // + span: $DIR/move_projection.rs:19:28: 19:34
+                                           // + literal: Const { ty: fn(Foo) -> bool {opaque::<Foo>}, val: Value(<ZST>) }
+      }
+  
+      bb1: {
+          _0 = opaque::<u8>(move _3) -> bb2; // scope 0 at $DIR/move_projection.rs:+9:13: +9:44
+                                           // mir::Constant
+                                           // + span: $DIR/move_projection.rs:22:28: 22:34
+                                           // + literal: Const { ty: fn(u8) -> bool {opaque::<u8>}, val: Value(<ZST>) }
+      }
+  
+      bb2: {
+          return;                          // scope 0 at $DIR/move_projection.rs:+12:13: +12:21
+      }
+  }
+  

tests/mir-opt/copy-prop/move_projection.rs

@@ -0,0 +1,34 @@
+// unit-test: CopyProp
+
+#![feature(custom_mir, core_intrinsics)]
+#![allow(unused_assignments)]
+extern crate core;
+use core::intrinsics::mir::*;
+
+fn opaque(_: impl Sized) -> bool { true }
+
+struct Foo(u8);
+
+#[custom_mir(dialect = "analysis", phase = "post-cleanup")]
+fn f(a: Foo) -> bool {
+    mir!(
+        {
+            let b = a;
+            // This is a move out of a copy, so must become a copy of `a.0`.
+            let c = Move(b.0);
+            Call(RET, bb1, opaque(Move(a)))
+        }
+        bb1 = {
+            Call(RET, ret, opaque(Move(c)))
+        }
+        ret = {
+            Return()
+        }
+    )
+}
+
+fn main() {
+    assert!(f(Foo(0)));
+}
+
+// EMIT_MIR move_projection.f.CopyProp.diff

tests/mir-opt/simple_option_map_e2e.ezmap.PreCodegen.after.mir

@@ -34,7 +34,7 @@ fn ezmap(_1: Option<i32>) -> Option<i32> {
     }
 
     bb3: {
-        _4 = move ((_1 as Some).0: i32); // scope 1 at $DIR/simple_option_map_e2e.rs:7:14: 7:15
+        _4 = ((_1 as Some).0: i32);      // scope 1 at $DIR/simple_option_map_e2e.rs:7:14: 7:15
         StorageLive(_5);                 // scope 2 at $DIR/simple_option_map_e2e.rs:7:25: 7:29
         _5 = Add(_4, const 1_i32);       // scope 3 at $DIR/simple_option_map_e2e.rs:+1:16: +1:21
         _0 = Option::<i32>::Some(move _5); // scope 2 at $DIR/simple_option_map_e2e.rs:7:20: 7:30

tests/ui/associated-types/hr-associated-type-projection-1.stderr

@@ -16,8 +16,8 @@ LL |     for<'b> <Self as UnsafeCopy<'b, T>>::Item: std::ops::Deref<Target = T>,
    |                                                                ^^^^^^^^^^ required by this bound in `UnsafeCopy`
 help: consider further restricting this bound
    |
-LL | impl<T: Copy + std::ops::Deref + Deref<Target = T>> UnsafeCopy<'_, T> for T {
-   |                                +++++++++++++++++++
+LL | impl<T: Copy + std::ops::Deref<Target = T>> UnsafeCopy<'_, T> for T {
+   |                               ++++++++++++
 
 error: aborting due to previous error
 

tests/ui/async-await/future-sizes/async-awaiting-fut.rs

@@ -0,0 +1,24 @@
+// compile-flags: -Z print-type-sizes --crate-type lib
+// edition:2021
+// build-pass
+// ignore-pass
+
+async fn wait() {}
+
+async fn big_fut(arg: [u8; 1024]) {}
+
+async fn calls_fut(fut: impl std::future::Future<Output = ()>) {
+    loop {
+        wait().await;
+        if true {
+            return fut.await;
+        } else {
+            wait().await;
+        }
+    }
+}
+
+pub async fn test() {
+    let fut = big_fut([0u8; 1024]);
+    calls_fut(fut).await;
+}

tests/ui/async-await/future-sizes/async-awaiting-fut.stdout

@@ -0,0 +1,72 @@
+print-type-size type: `[async fn body@$DIR/async-awaiting-fut.rs:21:21: 24:2]`: 3078 bytes, alignment: 1 bytes
+print-type-size     discriminant: 1 bytes
+print-type-size     variant `Unresumed`: 0 bytes
+print-type-size     variant `Suspend0`: 3077 bytes
+print-type-size         local `.__awaitee`: 3077 bytes, offset: 0 bytes, alignment: 1 bytes
+print-type-size     variant `Returned`: 0 bytes
+print-type-size     variant `Panicked`: 0 bytes
+print-type-size type: `[async fn body@$DIR/async-awaiting-fut.rs:10:64: 19:2]`: 3077 bytes, alignment: 1 bytes
+print-type-size     discriminant: 1 bytes
+print-type-size     variant `Unresumed`: 2051 bytes
+print-type-size         padding: 1026 bytes
+print-type-size         upvar `.fut`: 1025 bytes, alignment: 1 bytes
+print-type-size     variant `Suspend0`: 2052 bytes
+print-type-size         local `.fut`: 1025 bytes, offset: 0 bytes, alignment: 1 bytes
+print-type-size         local `..generator_field4`: 1 bytes
+print-type-size         padding: 1 bytes
+print-type-size         upvar `.fut`: 1025 bytes, alignment: 1 bytes
+print-type-size         local `.__awaitee`: 1 bytes
+print-type-size     variant `Suspend1`: 3076 bytes
+print-type-size         padding: 1024 bytes
+print-type-size         local `..generator_field4`: 1 bytes, alignment: 1 bytes
+print-type-size         padding: 1 bytes
+print-type-size         upvar `.fut`: 1025 bytes, alignment: 1 bytes
+print-type-size         local `.__awaitee`: 1025 bytes
+print-type-size     variant `Suspend2`: 2052 bytes
+print-type-size         local `.fut`: 1025 bytes, offset: 0 bytes, alignment: 1 bytes
+print-type-size         local `..generator_field4`: 1 bytes
+print-type-size         padding: 1 bytes
+print-type-size         upvar `.fut`: 1025 bytes, alignment: 1 bytes
+print-type-size         local `.__awaitee`: 1 bytes
+print-type-size     variant `Returned`: 2051 bytes
+print-type-size         padding: 1026 bytes
+print-type-size         upvar `.fut`: 1025 bytes, alignment: 1 bytes
+print-type-size     variant `Panicked`: 2051 bytes
+print-type-size         padding: 1026 bytes
+print-type-size         upvar `.fut`: 1025 bytes, alignment: 1 bytes
+print-type-size type: `std::mem::ManuallyDrop<[async fn body@$DIR/async-awaiting-fut.rs:10:64: 19:2]>`: 3077 bytes, alignment: 1 bytes
+print-type-size     field `.value`: 3077 bytes
+print-type-size type: `std::mem::MaybeUninit<[async fn body@$DIR/async-awaiting-fut.rs:10:64: 19:2]>`: 3077 bytes, alignment: 1 bytes
+print-type-size     variant `MaybeUninit`: 3077 bytes
+print-type-size         field `.uninit`: 0 bytes
+print-type-size         field `.value`: 3077 bytes
+print-type-size type: `[async fn body@$DIR/async-awaiting-fut.rs:8:35: 8:37]`: 1025 bytes, alignment: 1 bytes
+print-type-size     discriminant: 1 bytes
+print-type-size     variant `Unresumed`: 1024 bytes
+print-type-size         upvar `.arg`: 1024 bytes, offset: 0 bytes, alignment: 1 bytes
+print-type-size     variant `Returned`: 1024 bytes
+print-type-size         upvar `.arg`: 1024 bytes, offset: 0 bytes, alignment: 1 bytes
+print-type-size     variant `Panicked`: 1024 bytes
+print-type-size         upvar `.arg`: 1024 bytes, offset: 0 bytes, alignment: 1 bytes
+print-type-size type: `std::mem::ManuallyDrop<[async fn body@$DIR/async-awaiting-fut.rs:8:35: 8:37]>`: 1025 bytes, alignment: 1 bytes
+print-type-size     field `.value`: 1025 bytes
+print-type-size type: `std::mem::MaybeUninit<[async fn body@$DIR/async-awaiting-fut.rs:8:35: 8:37]>`: 1025 bytes, alignment: 1 bytes
+print-type-size     variant `MaybeUninit`: 1025 bytes
+print-type-size         field `.uninit`: 0 bytes
+print-type-size         field `.value`: 1025 bytes
+print-type-size type: `[async fn body@$DIR/async-awaiting-fut.rs:6:17: 6:19]`: 1 bytes, alignment: 1 bytes
+print-type-size     discriminant: 1 bytes
+print-type-size     variant `Unresumed`: 0 bytes
+print-type-size     variant `Returned`: 0 bytes
+print-type-size     variant `Panicked`: 0 bytes
+print-type-size type: `std::mem::ManuallyDrop<bool>`: 1 bytes, alignment: 1 bytes
+print-type-size     field `.value`: 1 bytes
+print-type-size type: `std::mem::MaybeUninit<bool>`: 1 bytes, alignment: 1 bytes
+print-type-size     variant `MaybeUninit`: 1 bytes
+print-type-size         field `.uninit`: 0 bytes
+print-type-size         field `.value`: 1 bytes
+print-type-size type: `std::task::Poll<()>`: 1 bytes, alignment: 1 bytes
+print-type-size     discriminant: 1 bytes
+print-type-size     variant `Ready`: 0 bytes
+print-type-size         field `.0`: 0 bytes
+print-type-size     variant `Pending`: 0 bytes

tests/ui/error-codes/E0523.rs

@@ -0,0 +1,14 @@
+// aux-build:crateresolve1-1.rs
+// aux-build:crateresolve1-2.rs
+// aux-build:crateresolve1-3.rs
+
+// normalize-stderr-test: "\.nll/" -> "/"
+// normalize-stderr-test: "\\\?\\" -> ""
+// normalize-stderr-test: "(lib)?crateresolve1-([123])\.[a-z]+" -> "libcrateresolve1-$2.somelib"
+
+// NOTE: This test is duplicated from `tests/ui/crate-loading/crateresolve1.rs`.
+
+extern crate crateresolve1;
+//~^ ERROR multiple candidates for `rlib` dependency `crateresolve1` found
+
+fn main() {}

tests/ui/error-codes/E0523.stderr

@@ -0,0 +1,13 @@
+error[E0464]: multiple candidates for `rlib` dependency `crateresolve1` found
+  --> $DIR/E0523.rs:11:1
+   |
+LL | extern crate crateresolve1;
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: candidate #1: $TEST_BUILD_DIR/error-codes/E0523/auxiliary/libcrateresolve1-1.somelib
+   = note: candidate #2: $TEST_BUILD_DIR/error-codes/E0523/auxiliary/libcrateresolve1-2.somelib
+   = note: candidate #3: $TEST_BUILD_DIR/error-codes/E0523/auxiliary/libcrateresolve1-3.somelib
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0464`.

tests/ui/generic-associated-types/issue-68656-unsized-values.stderr

@@ -15,8 +15,8 @@ LL |     type Item<'a>: std::ops::Deref<Target = T>;
    |                                    ^^^^^^^^^^ required by this bound in `UnsafeCopy::Item`
 help: consider further restricting this bound
    |
-LL | impl<T: Copy + std::ops::Deref + Deref<Target = T>> UnsafeCopy<T> for T {
-   |                                +++++++++++++++++++
+LL | impl<T: Copy + std::ops::Deref<Target = T>> UnsafeCopy<T> for T {
+   |                               ++++++++++++
 
 error: aborting due to previous error
 

tests/ui/generic-associated-types/missing-bounds.fixed

@@ -4,7 +4,7 @@ use std::ops::Add;
 
 struct A<B>(B);
 
-impl<B> Add for A<B> where B: Add + Add<Output = B> {
+impl<B> Add for A<B> where B: Add<Output = B> {
     type Output = Self;
 
     fn add(self, rhs: Self) -> Self {
@@ -14,7 +14,7 @@ impl<B> Add for A<B> where B: Add + Add<Output = B> {
 
 struct C<B>(B);
 
-impl<B: Add + Add<Output = B>> Add for C<B> {
+impl<B: Add<Output = B>> Add for C<B> {
     type Output = Self;
 
     fn add(self, rhs: Self) -> Self {
@@ -34,7 +34,7 @@ impl<B: std::ops::Add<Output = B>> Add for D<B> {
 
 struct E<B>(B);
 
-impl<B: Add + Add<Output = B>> Add for E<B> where B: Add<Output = B> {
+impl<B: Add<Output = B>> Add for E<B> where B: Add<Output = B> {
     //~^ ERROR equality constraints are not yet supported in `where` clauses
     type Output = Self;
 

tests/ui/generic-associated-types/missing-bounds.stderr

@@ -37,8 +37,8 @@ LL | struct A<B>(B);
    |        ^
 help: consider further restricting this bound
    |
-LL | impl<B> Add for A<B> where B: Add + Add<Output = B> {
-   |                                   +++++++++++++++++
+LL | impl<B> Add for A<B> where B: Add<Output = B> {
+   |                                  ++++++++++++
 
 error[E0308]: mismatched types
   --> $DIR/missing-bounds.rs:21:14
@@ -60,8 +60,8 @@ LL | struct C<B>(B);
    |        ^
 help: consider further restricting this bound
    |
-LL | impl<B: Add + Add<Output = B>> Add for C<B> {
-   |             +++++++++++++++++
+LL | impl<B: Add<Output = B>> Add for C<B> {
+   |            ++++++++++++
 
 error[E0369]: cannot add `B` to `B`
   --> $DIR/missing-bounds.rs:31:21
@@ -96,8 +96,8 @@ LL | struct E<B>(B);
    |        ^
 help: consider further restricting this bound
    |
-LL | impl<B: Add + Add<Output = B>> Add for E<B> where <B as Add>::Output = B {
-   |             +++++++++++++++++
+LL | impl<B: Add<Output = B>> Add for E<B> where <B as Add>::Output = B {
+   |            ++++++++++++
 
 error: aborting due to 5 previous errors
 

tests/ui/suggestions/restrict-existing-type-bounds.rs

@@ -0,0 +1,30 @@
+pub trait TryAdd<Rhs = Self> {
+    type Error;
+    type Output;
+
+    fn try_add(self, rhs: Rhs) -> Result<Self::Output, Self::Error>;
+}
+
+impl<T: TryAdd> TryAdd for Option<T> {
+    type Error = <T as TryAdd>::Error;
+    type Output = Option<<T as TryAdd>::Output>;
+
+    fn try_add(self, rhs: Self) -> Result<Self::Output, Self::Error> {
+        Ok(self) //~ ERROR mismatched types
+    }
+}
+
+struct Other<A>(A);
+
+struct X;
+
+impl<T: TryAdd<Error = X>> TryAdd for Other<T> {
+    type Error = <T as TryAdd>::Error;
+    type Output = Other<<T as TryAdd>::Output>;
+
+    fn try_add(self, rhs: Self) -> Result<Self::Output, Self::Error> {
+        Ok(self) //~ ERROR mismatched types
+    }
+}
+
+fn main() {}

tests/ui/suggestions/restrict-existing-type-bounds.stderr

@@ -0,0 +1,57 @@
+error[E0308]: mismatched types
+  --> $DIR/restrict-existing-type-bounds.rs:13:12
+   |
+LL | impl<T: TryAdd> TryAdd for Option<T> {
+   |      - this type parameter
+...
+LL |         Ok(self)
+   |         -- ^^^^ expected `Option<<T as TryAdd>::Output>`, found `Option<T>`
+   |         |
+   |         arguments to this enum variant are incorrect
+   |
+   = note: expected enum `Option<<T as TryAdd>::Output>`
+              found enum `Option<T>`
+help: the type constructed contains `Option<T>` due to the type of the argument passed
+  --> $DIR/restrict-existing-type-bounds.rs:13:9
+   |
+LL |         Ok(self)
+   |         ^^^----^
+   |            |
+   |            this argument influences the type of `Ok`
+note: tuple variant defined here
+  --> $SRC_DIR/core/src/result.rs:LL:COL
+help: consider further restricting this bound
+   |
+LL | impl<T: TryAdd<Output = T>> TryAdd for Option<T> {
+   |               ++++++++++++
+
+error[E0308]: mismatched types
+  --> $DIR/restrict-existing-type-bounds.rs:26:12
+   |
+LL | impl<T: TryAdd<Error = X>> TryAdd for Other<T> {
+   |      - this type parameter
+...
+LL |         Ok(self)
+   |         -- ^^^^ expected `Other<<T as TryAdd>::Output>`, found `Other<T>`
+   |         |
+   |         arguments to this enum variant are incorrect
+   |
+   = note: expected struct `Other<<T as TryAdd>::Output>`
+              found struct `Other<T>`
+help: the type constructed contains `Other<T>` due to the type of the argument passed
+  --> $DIR/restrict-existing-type-bounds.rs:26:9
+   |
+LL |         Ok(self)
+   |         ^^^----^
+   |            |
+   |            this argument influences the type of `Ok`
+note: tuple variant defined here
+  --> $SRC_DIR/core/src/result.rs:LL:COL
+help: consider further restricting this bound
+   |
+LL | impl<T: TryAdd<Error = X, Output = T>> TryAdd for Other<T> {
+   |                         ++++++++++++
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0308`.

tests/ui/suggestions/type-mismatch-byte-literal.rs

@@ -12,7 +12,19 @@ fn main() {
     //~^ ERROR: mismatched types [E0308]
     //~| HELP: if you meant to write a byte literal, prefix with `b`
 
+    let _a: u8 = '\x20';
+    //~^ ERROR: mismatched types [E0308]
+    //~| HELP: if you meant to write a byte literal, prefix with `b`
+
+    // Do not issue the suggestion if the char literal is a Unicode escape
+    foo('\u{0080}');
+    //~^ ERROR: mismatched types [E0308]
+
     // Do not issue the suggestion if the char literal isn't ASCII
     let _t: u8 = '€';
     //~^ ERROR: mismatched types [E0308]
+
+    // Do not issue the suggestion if the char literal isn't ASCII
+    foo('\u{1f980}');
+    //~^ ERROR: mismatched types [E0308]
 }

tests/ui/suggestions/type-mismatch-byte-literal.stderr

@@ -30,13 +30,54 @@ LL |     foo(b'#');
    |         ~~~~
 
 error[E0308]: mismatched types
-  --> $DIR/type-mismatch-byte-literal.rs:16:18
+  --> $DIR/type-mismatch-byte-literal.rs:15:18
+   |
+LL |     let _a: u8 = '\x20';
+   |             --   ^^^^^^ expected `u8`, found `char`
+   |             |
+   |             expected due to this
+   |
+help: if you meant to write a byte literal, prefix with `b`
+   |
+LL |     let _a: u8 = b'\x20';
+   |                  ~~~~~~~
+
+error[E0308]: mismatched types
+  --> $DIR/type-mismatch-byte-literal.rs:20:9
+   |
+LL |     foo('\u{0080}');
+   |     --- ^^^^^^^^^^ expected `u8`, found `char`
+   |     |
+   |     arguments to this function are incorrect
+   |
+note: function defined here
+  --> $DIR/type-mismatch-byte-literal.rs:4:4
+   |
+LL | fn foo(_t: u8) {}
+   |    ^^^ ------
+
+error[E0308]: mismatched types
+  --> $DIR/type-mismatch-byte-literal.rs:24:18
    |
 LL |     let _t: u8 = '€';
    |             --   ^^^ expected `u8`, found `char`
    |             |
    |             expected due to this
 
-error: aborting due to 3 previous errors
+error[E0308]: mismatched types
+  --> $DIR/type-mismatch-byte-literal.rs:28:9
+   |
+LL |     foo('\u{1f980}');
+   |     --- ^^^^^^^^^^^ expected `u8`, found `char`
+   |     |
+   |     arguments to this function are incorrect
+   |
+note: function defined here
+  --> $DIR/type-mismatch-byte-literal.rs:4:4
+   |
+LL | fn foo(_t: u8) {}
+   |    ^^^ ------
+
+error: aborting due to 6 previous errors
 
 For more information about this error, try `rustc --explain E0308`.