rust/tests/ui/specialization/specialization-overlap-projection.rs
2024-05-30 15:52:29 -04:00

31 lines
872 B
Rust

//@ revisions: current next
//@ ignore-compare-mode-next-solver (explicit revisions)
//@[next] compile-flags: -Znext-solver
//@[current] check-pass
// Test that impls on projected self types can resolve overlap, even when the
// projections involve specialization, so long as the associated type is
// provided by the most specialized impl.
#![feature(specialization)] //~ WARN the feature `specialization` is incomplete
trait Assoc {
type Output;
}
impl<T> Assoc for T {
default type Output = bool;
}
impl Assoc for u8 { type Output = u8; }
impl Assoc for u16 { type Output = u16; }
trait Foo {}
impl Foo for u32 {}
impl Foo for <u8 as Assoc>::Output {}
//[next]~^ ERROR conflicting implementations of trait `Foo` for type `u32`
impl Foo for <u16 as Assoc>::Output {}
//[next]~^ ERROR conflicting implementations of trait `Foo` for type `u32`
fn main() {}