rust/src/librustc_error_codes/error_codes/E0530.md

A binding shadowed something it shouldn't.

Erroneous code example:

static TEST: i32 = 0;

let r: (i32, i32) = (0, 0);
match r {
    TEST => {} // error: match bindings cannot shadow statics
}

To fix this error, just change the binding's name in order to avoid shadowing one of the following:

• struct name
• struct/enum variant
• static
• const
• associated const

Fixed example:

static TEST: i32 = 0;

let r: (i32, i32) = (0, 0);
match r {
    something => {} // ok!
}