File: multiple-occurrence-ambiguousity.rs

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rustc 1.85.0%2Bdfsg2-3
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//@ check-fail
#![feature(trait_upcasting)]

trait Bar<T> {
    fn bar(&self, _: T) {}
}

trait Foo: Bar<i32> + Bar<u32> {
    fn foo(&self, _: ()) {}
}

struct S;

impl Bar<i32> for S {}
impl Bar<u32> for S {}
impl Foo for S {}

fn main() {
    let s: &dyn Foo = &S;
    let t: &dyn Bar<_> = s; //~ ERROR mismatched types
}