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//@ check-pass
// From https://github.com/rust-lang/rust/issues/54121/
//
// Whether the code compiled depended on the order of the trait bounds in
// `type T: Tr<u8, u8> + Tr<u16, u16>`
// But both should compile as order shouldn't matter.
trait Tr<A, B> {
fn exec(a: A, b: B);
}
trait P {
// This compiled successfully
type T: Tr<u16, u16> + Tr<u8, u8>;
}
trait Q {
// This didn't compile
type T: Tr<u8, u8> + Tr<u16, u16>;
}
#[allow(dead_code)]
fn f<S: P>() {
<S as P>::T::exec(0u8, 0u8)
}
#[allow(dead_code)]
fn g<S: Q>() {
// A mismatched types error was emitted on this line.
<S as Q>::T::exec(0u8, 0u8)
}
// Another reproduction of the same issue
trait Trait {
type Type: Into<Self::Type1> + Into<Self::Type2> + Copy;
type Type1;
type Type2;
}
#[allow(dead_code)]
fn foo<T: Trait>(x: T::Type) {
let _1: T::Type1 = x.into();
let _2: T::Type2 = x.into();
}
fn main() { }
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