From: bors <bors@rust-lang.org>
Date: Wed, 9 Aug 2017 04:03:49 +0000 (+0000)
Subject: Auto merge of #43728 - zackmdavis:fnused, r=eddyb
X-Git-Url: https://git.lizzy.rs/?a=commitdiff_plain;h=3f977baf34ed32c64c4ff185b4ef6ae2c2948afc;p=rust.git

Auto merge of #43728 - zackmdavis:fnused, r=eddyb

#[must_use] for functions

This implements [RFC 1940](https://github.com/rust-lang/rfcs/pull/1940).

The RFC and discussion thereof seem to suggest that tagging `PartialEq::eq` and friends as `#[must_use]` would automatically lint for unused comparisons, but it doesn't work out that way (at least the way I've implemented it): unused `.eq` method calls get linted, but not `==` expressions. (The lint operates on the HIR, which sees binary operations as their own thing, even if they ultimately just call `.eq` _&c._.)

What do _you_ think??

Resolves #43302.
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3f977baf34ed32c64c4ff185b4ef6ae2c2948afc