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add suggestion to use the async_recursion crate

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This commit is contained in:
Henry Boisdequin 2021-02-09 18:43:39 +05:30
parent 1279b3b923
commit 4af417a78a
3 changed files with 6 additions and 0 deletions
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3
compiler/rustc_typeck/src/check/check.rs
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@ -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();
}