tree 4a9b39bd83822b2652034fb83745258441d17ae3
parent 0a1b2267e45ed0a5bdbfcbe522024729c8bd1387
parent 3246f495d0c52549ca2f3722a915360518f0c062
author Pietro Albini <pietro@pietroalbini.org> 1544881653 +0100
committer GitHub <noreply@github.com> 1544881653 +0100
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Rollup merge of #56677 - aelred:must-use-on-traits, r=estebank

#[must_use] on traits in stdlib

Based on #55506.

Adds `#[must_use]` attribute to traits in the stdlib:
- `Iterator`
- `Future`
- `FnOnce`
- `Fn`
- `FnMut`

There may be other traits that should have the attribute, but I couldn't find/think of any.