diff options
Diffstat (limited to 'src/test/ui/impl-trait/issues/issue-83919.rs')
-rw-r--r-- | src/test/ui/impl-trait/issues/issue-83919.rs | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/test/ui/impl-trait/issues/issue-83919.rs b/src/test/ui/impl-trait/issues/issue-83919.rs new file mode 100644 index 000000000..e76443a65 --- /dev/null +++ b/src/test/ui/impl-trait/issues/issue-83919.rs @@ -0,0 +1,32 @@ +#![feature(type_alias_impl_trait)] + +// edition:2021 + +use std::future::Future; + +trait Foo { + type T; + type Fut2: Future<Output=Self::T>; // ICE got triggered with traits other than Future here + type Fut: Future<Output=Self::Fut2>; + fn get_fut(&self) -> Self::Fut; +} + +struct Implementor; + +impl Foo for Implementor { + type T = u64; + type Fut2 = impl Future<Output=u64>; + type Fut = impl Future<Output=Self::Fut2>; + + fn get_fut(&self) -> Self::Fut { + //~^ ERROR `{integer}` is not a future + async move { + 42 + // 42 does not impl Future and rustc does actually point out the error, + // but rustc used to panic. + // Putting a valid Future here always worked fine. + } + } +} + +fn main() {} |