File: union-lint-dead-code.rs

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#![deny(dead_code)]

union Foo {
    x: usize,
    b: bool, //~ ERROR: field `b` is never read
    _unused: u16,
}

fn field_read(f: Foo) -> usize {
    unsafe { f.x }
}

fn main() {
    let _ = field_read(Foo { x: 2 });
}