rust/tests/ui/consts/assoc_const_generic_impl.rs

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//@ build-fail
trait ZeroSized: Sized {
const I_AM_ZERO_SIZED: ();
fn requires_zero_size(self);
}
impl<T: Sized> ZeroSized for T {
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const I_AM_ZERO_SIZED: () = [()][std::mem::size_of::<Self>()]; //~ ERROR evaluation of `<u32 as ZeroSized>::I_AM_ZERO_SIZED` failed
fn requires_zero_size(self) {
Self::I_AM_ZERO_SIZED;
println!("requires_zero_size called");
}
}
fn main() {
().requires_zero_size();
42_u32.requires_zero_size();
}