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| -rw-r--r-- | src/doc/reference.md | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/doc/reference.md b/src/doc/reference.md index f0ab1488d40..d14322a0655 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 |