mirror of
https://github.com/rust-lang/rust.git
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Point at tail expression on rpit E0277
```
error[E0277]: the trait bound `{gen block@$DIR/gen_block_is_coro.rs:7:5: 7:8}: Coroutine` is not satisfied
--> $DIR/gen_block_is_coro.rs:6:13
|
LL | fn foo() -> impl Coroutine<Yield = u32, Return = ()> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Coroutine` is not implemented for `{gen block@$DIR/gen_block_is_coro.rs:7:5: 7:8}`
LL | gen { yield 42 }
| ---------------- return type was inferred to be `{gen block@$DIR/gen_block_is_coro.rs:7:5: 7:8}` here
```
The secondary span label is new.
This commit is contained in:
Esteban Küber
parent
86b5965608
commit
092ecca5b9
@ -3563,17 +3563,34 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
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)]);
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}
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ObligationCauseCode::OpaqueReturnType(expr_info) => {
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if let Some((expr_ty, hir_id)) = expr_info {
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let expr_ty = self.tcx.short_ty_string(expr_ty, long_ty_file);
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let expr = self.infcx.tcx.hir().expect_expr(hir_id);
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err.span_label(
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expr.span,
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with_forced_trimmed_paths!(format!(
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"return type was inferred to be `{expr_ty}` here",
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)),
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);
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suggest_remove_deref(err, &expr);
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}
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let (expr_ty, expr) = if let Some((expr_ty, hir_id)) = expr_info {
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let expr_ty = tcx.short_ty_string(expr_ty, long_ty_file);
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let expr = tcx.hir().expect_expr(hir_id);
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(expr_ty, expr)
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} else if let Some(body_id) = tcx.hir_node_by_def_id(body_id).body_id()
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&& let body = tcx.hir().body(body_id)
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&& let hir::ExprKind::Block(block, _) = body.value.kind
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&& let Some(expr) = block.expr
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&& let Some(expr_ty) = self
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.typeck_results
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.as_ref()
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.and_then(|typeck| typeck.node_type_opt(expr.hir_id))
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&& let Some(pred) = predicate.as_clause()
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&& let ty::ClauseKind::Trait(pred) = pred.kind().skip_binder()
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&& self.can_eq(param_env, pred.self_ty(), expr_ty)
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{
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let expr_ty = tcx.short_ty_string(expr_ty, long_ty_file);
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(expr_ty, expr)
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} else {
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return;
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};
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err.span_label(
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expr.span,
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with_forced_trimmed_paths!(format!(
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"return type was inferred to be `{expr_ty}` here",
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)),
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);
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suggest_remove_deref(err, &expr);
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}
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}
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}
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@ -3,6 +3,9 @@ error[E0277]: `()` is not a future
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|
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LL | fn get_future() -> impl Future<Output = ()> {
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| ^^^^^^^^^^^^^^^^^^^^^^^^ `()` is not a future
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LL |
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LL | panic!()
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| -------- return type was inferred to be `_` here
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|
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= help: the trait `Future` is not implemented for `()`
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@ -5,7 +5,10 @@ LL | fn foo() -> impl Coroutine<u8> {
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| ^^^^^^^^^^^^^^^^^^ expected due to this
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...
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LL | |_: ()| {}
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| ------- found signature defined here
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| ----------
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| |
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| found signature defined here
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| return type was inferred to be `{coroutine@$DIR/arg-count-mismatch-on-unit-input.rs:8:5: 8:12}` here
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|
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= note: expected coroutine signature `fn(u8) -> _`
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found coroutine signature `fn(()) -> _`
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@ -3,18 +3,24 @@ error[E0277]: the trait bound `{gen block@$DIR/gen_block_is_coro.rs:7:5: 7:8}: C
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|
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LL | fn foo() -> impl Coroutine<Yield = u32, Return = ()> {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Coroutine` is not implemented for `{gen block@$DIR/gen_block_is_coro.rs:7:5: 7:8}`
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LL | gen { yield 42 }
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| ---------------- return type was inferred to be `{gen block@$DIR/gen_block_is_coro.rs:7:5: 7:8}` here
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error[E0277]: the trait bound `{gen block@$DIR/gen_block_is_coro.rs:11:5: 11:8}: Coroutine` is not satisfied
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--> $DIR/gen_block_is_coro.rs:10:13
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|
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LL | fn bar() -> impl Coroutine<Yield = i64, Return = ()> {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Coroutine` is not implemented for `{gen block@$DIR/gen_block_is_coro.rs:11:5: 11:8}`
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LL | gen { yield 42 }
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| ---------------- return type was inferred to be `{gen block@$DIR/gen_block_is_coro.rs:11:5: 11:8}` here
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error[E0277]: the trait bound `{gen block@$DIR/gen_block_is_coro.rs:15:5: 15:8}: Coroutine` is not satisfied
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--> $DIR/gen_block_is_coro.rs:14:13
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|
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LL | fn baz() -> impl Coroutine<Yield = i32, Return = ()> {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Coroutine` is not implemented for `{gen block@$DIR/gen_block_is_coro.rs:15:5: 15:8}`
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LL | gen { yield 42 }
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| ---------------- return type was inferred to be `{gen block@$DIR/gen_block_is_coro.rs:15:5: 15:8}` here
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error: aborting due to 3 previous errors
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@ -3,6 +3,8 @@ error[E0277]: `{gen block@$DIR/gen_block_is_no_future.rs:5:5: 5:8}` is not a fut
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|
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LL | fn foo() -> impl std::future::Future {
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| ^^^^^^^^^^^^^^^^^^^^^^^^ `{gen block@$DIR/gen_block_is_no_future.rs:5:5: 5:8}` is not a future
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LL | gen { yield 42 }
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| ---------------- return type was inferred to be `{gen block@$DIR/gen_block_is_no_future.rs:5:5: 5:8}` here
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|
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= help: the trait `Future` is not implemented for `{gen block@$DIR/gen_block_is_no_future.rs:5:5: 5:8}`
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@ -14,6 +14,7 @@ fn foo(bar: bool) -> impl Coroutine<(bool,)> {
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#[coroutine]
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|bar| {
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//~^ NOTE: found signature defined here
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//~| NOTE: return type was inferred to be
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if bar {
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yield bar;
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}
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@ -1,11 +1,21 @@
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error[E0631]: type mismatch in coroutine arguments
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--> $DIR/issue-88653.rs:8:22
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LL | fn foo(bar: bool) -> impl Coroutine<(bool,)> {
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| ^^^^^^^^^^^^^^^^^^^^^^^ expected due to this
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LL | fn foo(bar: bool) -> impl Coroutine<(bool,)> {
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| ^^^^^^^^^^^^^^^^^^^^^^^ expected due to this
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...
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LL | |bar| {
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| ----- found signature defined here
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LL | |bar| {
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| -----
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| |
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| _____found signature defined here
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| |
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LL | |
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LL | |
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LL | | if bar {
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LL | | yield bar;
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LL | | }
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LL | | }
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| |_____- return type was inferred to be `{coroutine@$DIR/issue-88653.rs:15:5: 15:10}` here
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= note: expected coroutine signature `fn((bool,)) -> _`
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found coroutine signature `fn(bool) -> _`
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@ -1,4 +1,4 @@
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<svg width="1104px" height="362px" xmlns="http://www.w3.org/2000/svg">
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<svg width="1104px" height="398px" xmlns="http://www.w3.org/2000/svg">
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<style>
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.fg { fill: #AAAAAA }
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.bg { background: #000000 }
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@ -31,33 +31,37 @@
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</tspan>
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<tspan x="10px" y="100px"><tspan> </tspan><tspan class="fg-ansi256-012 bold">|</tspan><tspan> </tspan><tspan class="fg-ansi256-009 bold">^^^^^^^^^^^^^</tspan><tspan> </tspan><tspan class="fg-ansi256-009 bold">the trait `Bar<i32>` is not implemented for `Struct`</tspan>
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</tspan>
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<tspan x="10px" y="118px"><tspan> </tspan><tspan class="fg-ansi256-012 bold">|</tspan>
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<tspan x="10px" y="118px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">|</tspan><tspan> Struct</tspan>
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</tspan>
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<tspan x="10px" y="136px"><tspan> </tspan><tspan class="fg-ansi256-012 bold">= </tspan><tspan class="bold">help</tspan><tspan>: the trait `Bar<</tspan><tspan class="fg-magenta bold">i32</tspan><tspan>>` </tspan><tspan class="fg-magenta bold">is not</tspan><tspan> implemented for `Struct`</tspan>
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<tspan x="10px" y="136px"><tspan> </tspan><tspan class="fg-ansi256-012 bold">|</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">------</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">return type was inferred to be `Struct` here</tspan>
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</tspan>
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<tspan x="10px" y="154px"><tspan> but trait `Bar<</tspan><tspan class="fg-magenta bold">()</tspan><tspan>>` </tspan><tspan class="fg-magenta bold">is</tspan><tspan> implemented for it</tspan>
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<tspan x="10px" y="154px"><tspan> </tspan><tspan class="fg-ansi256-012 bold">|</tspan>
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</tspan>
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<tspan x="10px" y="172px"><tspan> </tspan><tspan class="fg-ansi256-012 bold">= </tspan><tspan class="bold">help</tspan><tspan>: for that trait implementation, expected `</tspan><tspan class="fg-magenta bold">()</tspan><tspan>`, found `</tspan><tspan class="fg-magenta bold">i32</tspan><tspan>`</tspan>
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<tspan x="10px" y="172px"><tspan> </tspan><tspan class="fg-ansi256-012 bold">= </tspan><tspan class="bold">help</tspan><tspan>: the trait `Bar<</tspan><tspan class="fg-magenta bold">i32</tspan><tspan>>` </tspan><tspan class="fg-magenta bold">is not</tspan><tspan> implemented for `Struct`</tspan>
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</tspan>
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<tspan x="10px" y="190px"><tspan class="fg-ansi256-010 bold">note</tspan><tspan>: required for `Struct` to implement `Foo<i32>`</tspan>
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<tspan x="10px" y="190px"><tspan> but trait `Bar<</tspan><tspan class="fg-magenta bold">()</tspan><tspan>>` </tspan><tspan class="fg-magenta bold">is</tspan><tspan> implemented for it</tspan>
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</tspan>
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<tspan x="10px" y="208px"><tspan> </tspan><tspan class="fg-ansi256-012 bold">--> </tspan><tspan>$DIR/highlight-difference-between-expected-trait-and-found-trait.rs:11:12</tspan>
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<tspan x="10px" y="208px"><tspan> </tspan><tspan class="fg-ansi256-012 bold">= </tspan><tspan class="bold">help</tspan><tspan>: for that trait implementation, expected `</tspan><tspan class="fg-magenta bold">()</tspan><tspan>`, found `</tspan><tspan class="fg-magenta bold">i32</tspan><tspan>`</tspan>
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</tspan>
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<tspan x="10px" y="226px"><tspan> </tspan><tspan class="fg-ansi256-012 bold">|</tspan>
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<tspan x="10px" y="226px"><tspan class="fg-ansi256-010 bold">note</tspan><tspan>: required for `Struct` to implement `Foo<i32>`</tspan>
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</tspan>
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<tspan x="10px" y="244px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">|</tspan><tspan> impl<T, K> Foo<K> for T where T: Bar<K></tspan>
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<tspan x="10px" y="244px"><tspan> </tspan><tspan class="fg-ansi256-012 bold">--> </tspan><tspan>$DIR/highlight-difference-between-expected-trait-and-found-trait.rs:11:12</tspan>
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</tspan>
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<tspan x="10px" y="262px"><tspan> </tspan><tspan class="fg-ansi256-012 bold">|</tspan><tspan> </tspan><tspan class="fg-ansi256-010 bold">^^^^^^</tspan><tspan> </tspan><tspan class="fg-ansi256-010 bold">^</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">------</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">unsatisfied trait bound introduced here</tspan>
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<tspan x="10px" y="262px"><tspan> </tspan><tspan class="fg-ansi256-012 bold">|</tspan>
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</tspan>
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<tspan x="10px" y="280px">
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<tspan x="10px" y="280px"><tspan class="fg-ansi256-012 bold">LL</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">|</tspan><tspan> impl<T, K> Foo<K> for T where T: Bar<K></tspan>
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</tspan>
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<tspan x="10px" y="298px"><tspan class="fg-ansi256-009 bold">error</tspan><tspan class="bold">: aborting due to 1 previous error</tspan>
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<tspan x="10px" y="298px"><tspan> </tspan><tspan class="fg-ansi256-012 bold">|</tspan><tspan> </tspan><tspan class="fg-ansi256-010 bold">^^^^^^</tspan><tspan> </tspan><tspan class="fg-ansi256-010 bold">^</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">------</tspan><tspan> </tspan><tspan class="fg-ansi256-012 bold">unsatisfied trait bound introduced here</tspan>
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</tspan>
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<tspan x="10px" y="316px">
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</tspan>
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<tspan x="10px" y="334px"><tspan class="bold">For more information about this error, try `rustc --explain E0277`.</tspan>
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<tspan x="10px" y="334px"><tspan class="fg-ansi256-009 bold">error</tspan><tspan class="bold">: aborting due to 1 previous error</tspan>
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</tspan>
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<tspan x="10px" y="352px">
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</tspan>
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<tspan x="10px" y="370px"><tspan class="bold">For more information about this error, try `rustc --explain E0277`.</tspan>
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</tspan>
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<tspan x="10px" y="388px">
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</tspan>
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</text>
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|
Before Width: | Height: | Size: 4.0 KiB After Width: | Height: | Size: 4.4 KiB |
@ -12,6 +12,9 @@ error[E0277]: the trait bound `S: Copy` is not satisfied in `(S, T)`
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|
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LL | fn foo<T: Default>() -> Self::E {
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| ^^^^^^^ within `(S, T)`, the trait `Copy` is not implemented for `S`
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...
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LL | (S::default(), T::default())
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| ---------------------------- return type was inferred to be `(S, T)` here
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|
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= note: required because it appears within the type `(S, T)`
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help: consider further restricting this bound
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@ -24,6 +27,9 @@ error[E0277]: the trait bound `T: Copy` is not satisfied in `(S, T)`
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|
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LL | fn foo<T: Default>() -> Self::E {
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| ^^^^^^^ within `(S, T)`, the trait `Copy` is not implemented for `T`
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...
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LL | (S::default(), T::default())
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| ---------------------------- return type was inferred to be `(S, T)` here
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|
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= note: required because it appears within the type `(S, T)`
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help: consider further restricting this bound
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@ -3,6 +3,9 @@ error[E0277]: the trait bound `{async block@$DIR/issue-55872-3.rs:15:9: 15:14}:
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|
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LL | fn foo<T>() -> Self::E {
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| ^^^^^^^ the trait `Copy` is not implemented for `{async block@$DIR/issue-55872-3.rs:15:9: 15:14}`
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LL |
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LL | async {}
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| -------- return type was inferred to be `{async block@$DIR/issue-55872-3.rs:15:9: 15:14}` here
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error: aborting due to 1 previous error
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@ -46,7 +46,9 @@ error[E0277]: the trait bound `impl Debug: From<impl Into<u32>>` is not satisfie
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--> $DIR/nested_impl_trait.rs:6:46
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|
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LL | fn bad_in_ret_position(x: impl Into<u32>) -> impl Into<impl Debug> { x }
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| ^^^^^^^^^^^^^^^^^^^^^ the trait `From<impl Into<u32>>` is not implemented for `impl Debug`
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| ^^^^^^^^^^^^^^^^^^^^^ - return type was inferred to be `impl Into<u32>` here
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| |
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| the trait `From<impl Into<u32>>` is not implemented for `impl Debug`
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|
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= help: the trait `Into<U>` is implemented for `T`
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= note: required for `impl Into<u32>` to implement `Into<impl Debug>`
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@ -55,7 +57,9 @@ error[E0277]: the trait bound `impl Debug: From<impl Into<u32>>` is not satisfie
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--> $DIR/nested_impl_trait.rs:19:34
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|
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LL | fn bad(x: impl Into<u32>) -> impl Into<impl Debug> { x }
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| ^^^^^^^^^^^^^^^^^^^^^ the trait `From<impl Into<u32>>` is not implemented for `impl Debug`
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| ^^^^^^^^^^^^^^^^^^^^^ - return type was inferred to be `impl Into<u32>` here
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| |
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| the trait `From<impl Into<u32>>` is not implemented for `impl Debug`
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|
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= help: the trait `Into<U>` is implemented for `T`
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= note: required for `impl Into<u32>` to implement `Into<impl Debug>`
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@ -3,6 +3,9 @@ error[E0283]: type annotations needed
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|
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LL | fn run() -> Foo<impl Future<Output = ()>> {
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| ^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type
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LL |
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LL | loop {}
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| ------- return type was inferred to be `!` here
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|
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= note: cannot satisfy `_: Future`
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@ -3,6 +3,9 @@ error[E0271]: type mismatch resolving `<() as Super>::Assoc == ()`
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|
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LL | fn test() -> impl Test {
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| ^^^^^^^^^ type mismatch resolving `<() as Super>::Assoc == ()`
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LL |
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LL | ()
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| -- return type was inferred to be `()` here
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|
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note: expected this to be `()`
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--> $DIR/projection-mismatch-in-impl-where-clause.rs:6:18
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@ -3,6 +3,9 @@ error[E0277]: the trait bound `Result<(), _>: Future` is not satisfied
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|
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LL | fn foo() -> impl Future<Item=(), Error=Box<dyn Error>> {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Future` is not implemented for `Result<(), _>`
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LL |
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LL | Ok(())
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| ------ return type was inferred to be `Result<(), _>` here
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|
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help: this trait has no implementations, consider adding one
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--> $DIR/lifetime-elision-return-type-trait.rs:1:1
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@ -3,6 +3,9 @@ error[E0271]: expected `foo` to be a fn item that returns `i32`, but it returns
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|
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LL | fn bar() -> impl Iterator<Item = i32> {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^ expected `i32`, found `()`
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...
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LL | x.iter_mut().map(foo)
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| --------------------- return type was inferred to be `Map<std::slice::IterMut<'_, Vec<u8>>, for<'a> fn(&'a mut Vec<u8>) {foo}>` here
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|
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= note: required for `Map<std::slice::IterMut<'_, Vec<u8>>, for<'a> fn(&'a mut Vec<u8>) {foo}>` to implement `Iterator`
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@ -3,6 +3,9 @@ error[E0277]: the trait bound `(): T` is not satisfied
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|
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LL | fn should_ret_unit() -> impl T {
|
||||
| ^^^^^^ the trait `T` is not implemented for `()`
|
||||
LL |
|
||||
LL | panic!()
|
||||
| -------- return type was inferred to be `_` here
|
||||
|
|
||||
= help: the trait `T` is implemented for `i32`
|
||||
|
||||
@ -11,6 +14,9 @@ error[E0277]: the trait bound `(): T` is not satisfied
|
||||
|
|
||||
LL | fn a() -> Foo {
|
||||
| ^^^ the trait `T` is not implemented for `()`
|
||||
LL |
|
||||
LL | panic!()
|
||||
| -------- return type was inferred to be `_` here
|
||||
|
|
||||
= help: the trait `T` is implemented for `i32`
|
||||
|
||||
|
||||
@ -3,6 +3,9 @@ error[E0277]: the trait bound `(): T` is not satisfied
|
||||
|
|
||||
LL | fn a() -> Foo {
|
||||
| ^^^ the trait `T` is not implemented for `()`
|
||||
...
|
||||
LL | panic!()
|
||||
| -------- return type was inferred to be `_` here
|
||||
|
|
||||
help: this trait has no implementations, consider adding one
|
||||
--> $DIR/impl_trait_fallback3.rs:5:1
|
||||
|
||||
@ -3,6 +3,9 @@ error[E0277]: the trait bound `(): T` is not satisfied
|
||||
|
|
||||
LL | fn foo() -> impl T {
|
||||
| ^^^^^^ the trait `T` is not implemented for `()`
|
||||
LL |
|
||||
LL | panic!()
|
||||
| -------- return type was inferred to be `_` here
|
||||
|
|
||||
help: this trait has no implementations, consider adding one
|
||||
--> $DIR/impl_trait_fallback4.rs:3:1
|
||||
|
||||
@ -4,7 +4,10 @@ error[E0283]: type annotations needed
|
||||
LL | fn unconstrained_foo() -> Wrapper<Foo> {
|
||||
| ------------ type must be known at this point
|
||||
LL | Wrapper::Second
|
||||
| ^^^^^^^^^^^^^^^ cannot infer type of the type parameter `T` declared on the enum `Wrapper`
|
||||
| ^^^^^^^^^^^^^^^
|
||||
| |
|
||||
| cannot infer type of the type parameter `T` declared on the enum `Wrapper`
|
||||
| return type was inferred to be `Wrapper<_>` here
|
||||
|
|
||||
= note: cannot satisfy `_: Copy`
|
||||
help: consider specifying the generic argument
|
||||
|
||||
@ -17,6 +17,9 @@ error[E0277]: the trait bound `{integer}: Trait<()>` is not satisfied
|
||||
|
|
||||
LL | fn produce() -> impl for<T> Trait<(), Assoc = impl Trait<T>> {
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Trait<()>` is not implemented for `{integer}`
|
||||
...
|
||||
LL | 16
|
||||
| -- return type was inferred to be `{integer}` here
|
||||
|
|
||||
help: this trait has no implementations, consider adding one
|
||||
--> $DIR/non-lifetime-binder-in-constraint.rs:4:1
|
||||
|
||||
Loading…
Reference in New Issue
Block a user