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pub trait Foo { const Y: usize; } struct Abc; impl Foo for Abc { const Y: usize = 8; } struct Def; impl Foo for Def { const Y: usize = 33; } pub fn test<A: Foo, B: Foo>() { let _array: [u32; <A as Foo>::Y]; //~^ ERROR generic parameters may not be used } fn main() {}