# Error code E0438

An associated constant whose name does not match any of the associated constants in the trait was used when implementing the trait.

Erroneous code example:

ⓘ

    trait Foo {}

    impl Foo for i32 {
        const BAR: bool = true;
    }

Run

Trait implementations can only implement associated constants that are members of the trait in question.

The solution to this problem is to remove the extraneous associated constant:

    trait Foo {}

    impl Foo for i32 {}

Run

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