src/test/ui/chalkify/impl_wf.rs


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// compile-flags: -Z chalk

trait Foo: Sized { }

trait Bar {
    type Item: Foo;
}

impl Foo for i32 { }

// FIXME(chalk): blocked on better handling of builtin traits for non-struct
// application types (or a workaround)
/*
impl Foo for str { }
//^ ERROR the size for values of type `str` cannot be known at compilation time
*/

// Implicit `T: Sized` bound.
impl<T> Foo for Option<T> { }

impl Bar for () {
    type Item = i32;
}

impl<T> Bar for Option<T> {
    type Item = Option<T>;
}

// FIXME(chalk): the ordering of these two errors differs between CI and local
// We need to figure out why its non-deterministic
/*
impl Bar for f32 {
//^ ERROR the trait bound `f32: Foo` is not satisfied
    type Item = f32;
    //^ ERROR the trait bound `f32: Foo` is not satisfied
}
*/

trait Baz<U: ?Sized> where U: Foo { }

impl Baz<i32> for i32 { }

impl Baz<f32> for f32 { }
//~^ ERROR the trait bound `f32: Foo` is not satisfied

fn main() {
}