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# Error code E0326

An implementation of a trait doesn’t match the type constraint.

Erroneous code example:

    #![allow(unused)]
    fn main() {
    trait Foo {
        const BAR: bool;
    }

    struct Bar;

    impl Foo for Bar {
        const BAR: u32 = 5; // error, expected bool, found u32
    }
    }

The types of any associated constants in a trait implementation must match the types in the trait definition.