mirror of https://github.com/rust-lang/rust
25 lines
500 B
Rust
25 lines
500 B
Rust
#![feature(type_alias_impl_trait)]
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#![allow(dead_code)]
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mod m {
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pub type Foo = impl std::fmt::Debug;
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pub fn foo() -> Foo {
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is_send(bar())
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}
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pub fn bar() {
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// Cycle: error today, but it'd be nice if it eventually worked
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is_send(foo());
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//~^ ERROR: cannot check whether the hidden type of `inference_cycle[4ecc]::m::Foo::{opaque#0}` satisfies auto traits
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}
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fn baz() -> Foo {
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()
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}
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fn is_send<T: Send>(_: T) {}
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}
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fn main() {}
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