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# Error code E0013

#### Note: this error code is no longer emitted by the compiler

Static and const variables can refer to other const variables. But a const variable cannot refer to a static variable.

Erroneous code example:

    #![allow(unused)]
    fn main() {
    static X: i32 = 42;
    const Y: i32 = X;
    }

In this example, `Y` cannot refer to `X`. To fix this, the value can be extracted as a const and then used:

    #![allow(unused)]
    fn main() {
    const A: i32 = 42;
    static X: i32 = A;
    const Y: i32 = A;
    }