#![feature(adt_const_params)] #![allow(incomplete_features)] #[derive(Debug, PartialEq, Eq)] struct Foo { value: i32, nested: &'static Bar, } #[derive(Debug, PartialEq, Eq)] struct Bar(T); struct Test; fn main() { let x: Test<{ Foo { value: 3, nested: &Bar(4), } }> = Test; let y: Test<{ Foo { value: 3, nested: &Bar(5), } }> = x; //~ ERROR mismatched types }