struct Foo<const N: usize = M, const M: usize = 10>;
//~^ ERROR generic parameters with a default cannot use forward declared identifiers

enum Bar<const N: usize = M, const M: usize = 10> {}
//~^ ERROR generic parameters with a default cannot use forward declared identifiers

struct Foo2<const N: usize = N>;
//~^ ERROR generic parameters with a default cannot use forward declared identifiers

enum Bar2<const N: usize = N> {}
//~^ ERROR generic parameters with a default cannot use forward declared identifiers

fn main() {}