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add suggestion to use the async_recursion crate #81926

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Feb 10, 2021
Merged

add suggestion to use the async_recursion crate #81926

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3 changes: 3 additions & 0 deletions compiler/rustc_typeck/src/check/check.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1446,6 +1446,9 @@ fn async_opaque_type_cycle_error(tcx: TyCtxt<'tcx>, span: Span) {
struct_span_err!(tcx.sess, span, E0733, "recursion in an `async fn` requires boxing")
.span_label(span, "recursive `async fn`")
.note("a recursive `async fn` must be rewritten to return a boxed `dyn Future`")
.note(
"consider using the `async_recursion` crate: https://crates.io/crates/async_recursion",
)
.emit();
}

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2 changes: 2 additions & 0 deletions src/test/ui/async-await/mutually-recursive-async-impl-trait-type.stderr
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Expand Up @@ -5,6 +5,7 @@ LL | async fn rec_1() {
| ^ recursive `async fn`
|
= note: a recursive `async fn` must be rewritten to return a boxed `dyn Future`
= note: consider using the `async_recursion` crate: https://crates.io/crates/async_recursion

error[E0733]: recursion in an `async fn` requires boxing
--> $DIR/mutually-recursive-async-impl-trait-type.rs:9:18
Expand All @@ -13,6 +14,7 @@ LL | async fn rec_2() {
| ^ recursive `async fn`
|
= note: a recursive `async fn` must be rewritten to return a boxed `dyn Future`
= note: consider using the `async_recursion` crate: https://crates.io/crates/async_recursion

error: aborting due to 2 previous errors

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1 change: 1 addition & 0 deletions src/test/ui/async-await/recursive-async-impl-trait-type.stderr
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ LL | async fn recursive_async_function() -> () {
| ^^ recursive `async fn`
|
= note: a recursive `async fn` must be rewritten to return a boxed `dyn Future`
= note: consider using the `async_recursion` crate: https://crates.io/crates/async_recursion

error: aborting due to previous error

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