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|
// Test equality constraints on associated types. Check we get type errors
// where we should.
pub trait Foo {
type A;
fn boo(&self) -> <Self as Foo>::A;
}
struct Bar;
impl Foo for isize {
type A = usize;
fn boo(&self) -> usize {
42
}
}
fn foo1<I: Foo<A=Bar>>(x: I) {
let _: Bar = x.boo();
}
fn foo2<I: Foo>(x: I) {
let _: Bar = x.boo();
//~^ ERROR mismatched types
//~| found associated type `<I as Foo>::A`
//~| expected struct `Bar`, found associated type
//~| expected struct `Bar`
}
pub fn baz(x: &dyn Foo<A=Bar>) {
let _: Bar = x.boo();
}
pub fn main() {
let a = 42;
foo1(a);
//~^ ERROR type mismatch resolving
baz(&a);
//~^ ERROR type mismatch resolving
}
|
