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fix: break inside async closure has incorrect span for enclosing closure #125078

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merged 1 commit into from
Jun 19, 2024
Merged

fix: break inside async closure has incorrect span for enclosing closure #125078

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10 changes: 9 additions & 1 deletion compiler/rustc_ast_lowering/src/item.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1311,6 +1311,14 @@ impl<'hir> LoweringContext<'_, 'hir> {
CoroutineKind::AsyncGen { .. } => hir::CoroutineDesugaring::AsyncGen,
};
let closure_id = coroutine_kind.closure_id();

let span = if let FnRetTy::Default(span) = decl.output
&& matches!(coroutine_source, rustc_hir::CoroutineSource::Closure)
{
body_span.with_lo(span.lo())
} else {
body_span
};
let coroutine_expr = self.make_desugared_coroutine_expr(
// The default capture mode here is by-ref. Later on during upvar analysis,
// we will force the captured arguments to by-move, but for async closures,
Expand All @@ -1319,7 +1327,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
CaptureBy::Ref,
closure_id,
None,
body_span,
span,
desugaring_kind,
coroutine_source,
mkbody,
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9 changes: 5 additions & 4 deletions tests/ui/async-await/async-closures/wrong-fn-kind.stderr
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Expand Up @@ -20,15 +20,16 @@ LL | fn needs_async_fn(_: impl async Fn()) {}
| ^^^^^^^^^^ required by this bound in `needs_async_fn`

error[E0596]: cannot borrow `x` as mutable, as it is a captured variable in a `Fn` closure
--> $DIR/wrong-fn-kind.rs:9:29
--> $DIR/wrong-fn-kind.rs:9:20
|
LL | fn needs_async_fn(_: impl async Fn()) {}
| --------------- change this to accept `FnMut` instead of `Fn`
...
LL | needs_async_fn(async || {
| _____--------------_--------_^
| | | |
| | | in this closure
| -------------- ^-------
| | |
| _____|______________in this closure
| | |
| | expects `Fn` instead of `FnMut`
LL | |
LL | | x += 1;
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1 change: 1 addition & 0 deletions tests/ui/coroutine/break-inside-coroutine-issue-124495.rs
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Expand Up @@ -18,6 +18,7 @@ async gen fn async_gen_fn() {

fn main() {
let _ = async { break; }; //~ ERROR `break` inside `async` block

let _ = async || { break; }; //~ ERROR `break` inside `async` closure

let _ = gen { break; }; //~ ERROR `break` inside `gen` block
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14 changes: 7 additions & 7 deletions tests/ui/coroutine/break-inside-coroutine-issue-124495.stderr
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Expand Up @@ -38,16 +38,16 @@ LL | let _ = async { break; };
| enclosing `async` block

error[E0267]: `break` inside `async` closure
--> $DIR/break-inside-coroutine-issue-124495.rs:21:24
--> $DIR/break-inside-coroutine-issue-124495.rs:22:24
|
LL | let _ = async || { break; };
| --^^^^^---
| | |
| | cannot `break` inside `async` closure
| enclosing `async` closure
| -----------^^^^^---
| | |
| | cannot `break` inside `async` closure
| enclosing `async` closure

error[E0267]: `break` inside `gen` block
--> $DIR/break-inside-coroutine-issue-124495.rs:23:19
--> $DIR/break-inside-coroutine-issue-124495.rs:24:19
|
LL | let _ = gen { break; };
| ------^^^^^---
Expand All @@ -56,7 +56,7 @@ LL | let _ = gen { break; };
| enclosing `gen` block

error[E0267]: `break` inside `async gen` block
--> $DIR/break-inside-coroutine-issue-124495.rs:25:25
--> $DIR/break-inside-coroutine-issue-124495.rs:26:25
|
LL | let _ = async gen { break; };
| ------------^^^^^---
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