E0530 - Error codes index
Description: Book listing all Rust error codes

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# Error code E0530

A binding shadowed something it shouldn’t.

A match arm or a variable has a name that is already used by something else, e.g.

- struct name
- enum variant
- static
- associated constant

This error may also happen when an enum variant with fields is used in a pattern, but without its fields.

    #![allow(unused)]
    fn main() {
    enum Enum {
        WithField(i32)
    }

    use Enum::*;
    match WithField(1) {
        WithField => {} // error: missing (_)
    }
    }

Match bindings cannot shadow statics:

    #![allow(unused)]
    fn main() {
    static TEST: i32 = 0;

    let r = 123;
    match r {
        TEST => {} // error: name of a static
    }
    }

Fixed examples:

    #![allow(unused)]
    fn main() {
    static TEST: i32 = 0;

    let r = 123;
    match r {
        some_value => {} // ok!
    }
    }

or

    #![allow(unused)]
    fn main() {
    const TEST: i32 = 0; // const, not static

    let r = 123;
    match r {
        TEST => {} // const is ok!
        other_values => {}
    }
    }