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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/async-await/feature-gate-async_fn_in_trait.rs | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/test/ui/async-await/feature-gate-async_fn_in_trait.rs b/src/test/ui/async-await/feature-gate-async_fn_in_trait.rs new file mode 100644 index 000000000..792f378cb --- /dev/null +++ b/src/test/ui/async-await/feature-gate-async_fn_in_trait.rs @@ -0,0 +1,25 @@ +// edition:2021 + +// RPITIT is not enough to allow use of async functions +#![allow(incomplete_features)] +#![feature(return_position_impl_trait_in_trait)] + +trait T { + async fn foo(); //~ ERROR functions in traits cannot be declared `async` +} + +// Both return_position_impl_trait_in_trait and async_fn_in_trait are required for this (see also +// feature-gate-return_position_impl_trait_in_trait.rs) +trait T2 { + async fn foo() -> impl Sized; //~ ERROR functions in traits cannot be declared `async` +} + +trait T3 { + fn foo() -> impl std::future::Future<Output = ()>; +} + +impl T3 for () { + async fn foo() {} //~ ERROR functions in traits cannot be declared `async` +} + +fn main() {} |