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Don't suggest awaiting in closure patterns #126915

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Jun 26, 2024
Merged

Don't suggest awaiting in closure patterns #126915

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6 changes: 4 additions & 2 deletions compiler/rustc_infer/src/infer/error_reporting/suggest.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -209,8 +209,10 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
}
(Some(ty), _) if self.same_type_modulo_infer(ty, exp_found.found) => match cause.code()
{
ObligationCauseCode::Pattern { span: Some(then_span), .. } => {
Some(ConsiderAddingAwait::FutureSugg { span: then_span.shrink_to_hi() })
ObligationCauseCode::Pattern { span: Some(then_span), origin_expr, .. } => {
origin_expr.then_some(ConsiderAddingAwait::FutureSugg {
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Is there any test that exercises the case when origin_expr is Some?

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yeah, most of suggest-missing-await.rs does

span: then_span.shrink_to_hi(),
})
}
ObligationCauseCode::IfExpression(box IfExpressionCause { then_id, .. }) => {
let then_span = self.find_block_span_from_hir_id(*then_id);
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7 changes: 7 additions & 0 deletions tests/ui/async-await/suggest-missing-await.rs
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Expand Up @@ -71,4 +71,11 @@ async fn suggest_await_in_generic_pattern() {
}
}

// Issue #126903
async fn do_async() {}
fn dont_suggest_awaiting_closure_patterns() {
Some(do_async()).map(|()| {});
//~^ ERROR mismatched types [E0308]
}

fn main() {}
14 changes: 13 additions & 1 deletion tests/ui/async-await/suggest-missing-await.stderr
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Expand Up @@ -133,6 +133,18 @@ help: consider `await`ing on the `Future`
LL | match dummy_result().await {
| ++++++

error: aborting due to 7 previous errors
error[E0308]: mismatched types
--> $DIR/suggest-missing-await.rs:77:27
|
LL | Some(do_async()).map(|()| {});
| ^^
| |
| expected future, found `()`
| expected due to this
|
= note: expected opaque type `impl Future<Output = ()>`
found unit type `()`

error: aborting due to 8 previous errors

For more information about this error, try `rustc --explain E0308`.
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