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33 lines
768 B
Rust
33 lines
768 B
Rust
#![feature(type_alias_impl_trait)]
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// edition:2021
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use std::future::Future;
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trait Foo {
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type T;
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type Fut2: Future<Output=Self::T>; // ICE got triggered with traits other than Future here
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type Fut: Future<Output=Self::Fut2>;
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fn get_fut(&self) -> Self::Fut;
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}
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struct Implementor;
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impl Foo for Implementor {
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type T = u64;
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type Fut2 = impl Future<Output=u64>;
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type Fut = impl Future<Output=Self::Fut2>;
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fn get_fut(&self) -> Self::Fut {
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//~^ ERROR `{integer}` is not a future
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async move {
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42
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// 42 does not impl Future and rustc does actually point out the error,
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// but rustc used to panic.
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// Putting a valid Future here always worked fine.
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}
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}
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}
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fn main() {}
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