// Test that we can't declare a const fn in an impl -- right now it's // just not allowed at all, though eventually it'd make sense to allow // it if the trait fn is const (but right now no trait fns can be // const). trait Foo { fn f() -> u32; } impl Foo for u32 { const fn f() -> u32 { //~^ ERROR functions in trait impls cannot be declared const 22 } } fn main() {}