File: const-default.rs

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// run-pass
pub struct ConstDefault<const N: usize = 3>;

impl<const N: usize> ConstDefault<N> {
    fn foo(self) -> usize {
        N
    }
}

impl ConstDefault {
    fn new() -> Self {
        ConstDefault
    }

    fn bar(self) {}
}

pub fn main() {
    let s = ConstDefault::new();
    assert_eq!(s.foo(), 3);

    let w = ConstDefault::<3>;
    w.bar();
}