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// Tests that specializing trait impls must be at least as const as the default impl.
#![feature(const_trait_impl, effects)] //~ WARN the feature `effects` is incomplete
#![feature(min_specialization)]
#[const_trait]
trait Value {
fn value() -> u32;
}
impl<T> const Value for T {
default fn value() -> u32 {
0
}
}
struct FortyTwo;
impl Value for FortyTwo { //~ ERROR cannot specialize on const impl with non-const impl
fn value() -> u32 {
println!("You can't do that (constly)");
42
}
}
fn main() {}
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