2 Checks for a `#[must_use]` attribute without
3 further information on functions and methods that return a type already
4 marked as `#[must_use]`.
7 The attribute isn't needed. Not using the result
8 will already be reported. Alternatively, one can add some text to the
9 attribute to improve the lint message.
14 fn double_must_use() -> Result<(), ()> {