rust/tests/ui/const-generics/early/trivial-const-arg-macro-nested-braces-2.rs

macro_rules! y {
    () => {
        N
        //~^ ERROR: generic parameters may not be used in const operations
    };
}

struct A<const N: usize>;

#[rustfmt::skip]
fn foo<const N: usize>() -> A<{{ y!() }}> {
    A::<1>
}

fn main() {}