From 0384722357d4a6dcc2a1e79b41cf9f0df50cb577 Mon Sep 17 00:00:00 2001 From: QuietMisdreavus Date: Wed, 17 Aug 2016 11:49:28 -0500 Subject: [PATCH] Add `must_use` to the Reference --- src/doc/reference.md | 3 +++ 1 file changed, 3 insertions(+) diff --git a/src/doc/reference.md b/src/doc/reference.md index f0ab1488d4015..d14322a0655ca 100644 --- a/src/doc/reference.md +++ b/src/doc/reference.md @@ -2070,6 +2070,9 @@ macro scope. trait of the same name. `{Self}` will be replaced with the type that is supposed to implement the trait but doesn't. To use this, the `on_unimplemented` feature gate must be enabled. +- `must_use` - on structs and enums, will warn if a value of this type isn't used or + assigned to a variable. You may also include an optional message by using + `#[must_use = "message"]` which will be given alongside the warning. ### Conditional compilation