mirror of https://github.com/rust-lang/rust
17 lines
572 B
Rust
17 lines
572 B
Rust
// https://github.com/rust-lang/rust/issues/73481
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// This test used to cause unsoundness, since one of the two possible
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// resolutions was chosen at random instead of erroring due to conflicts.
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#![feature(type_alias_impl_trait)]
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type X<A: ToString + Clone, B: ToString + Clone> = impl ToString;
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fn f<A: ToString + Clone, B: ToString + Clone>(a: A, b: B) -> (X<A, B>, X<B, A>) {
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(a.clone(), a)
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//~^ ERROR concrete type differs from previous defining opaque type
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}
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fn main() {
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println!("{}", <X<_, _> as ToString>::to_string(&f(42_i32, String::new()).1));
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}
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