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#![feature(trait_upcasting)]
trait Foo<T>: Bar<i32> + Bar<T> {}
trait Bar<T> {
fn bar(&self) -> Option<T> {
None
}
}
fn test_specific(x: &dyn Foo<i32>) {
let _ = x as &dyn Bar<i32>; // OK
}
fn test_specific2(x: &dyn Foo<u32>) {
let _ = x as &dyn Bar<i32>; // OK
}
fn test_specific3(x: &dyn Foo<i32>) {
let _ = x as &dyn Bar<u32>; // Error
//~^ ERROR non-primitive cast
}
fn test_infer_arg(x: &dyn Foo<u32>) {
let a = x as &dyn Bar<_>; // Ambiguous
//~^ ERROR non-primitive cast
let _ = a.bar();
}
fn main() {}
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