tests/ui/type-alias-impl-trait/generic_nondefining_use.rs


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#![feature(type_alias_impl_trait)]

use std::fmt::Debug;

fn main() {}

type OneTy<T> = impl Debug;

type OneLifetime<'a> = impl Debug;

type OneConst<const X: usize> = impl Debug;

// Not defining uses, because they doesn't define *all* possible generics.

fn concrete_ty() -> OneTy<u32> {
    5u32
    //~^ ERROR expected generic type parameter, found `u32`
}

fn concrete_lifetime() -> OneLifetime<'static> {
    6u32
    //~^ ERROR expected generic lifetime parameter, found `'static`
}

fn concrete_const() -> OneConst<{ 123 }> {
    7u32
    //~^ ERROR expected generic constant parameter, found `123`
}