Rollup merge of #35754 - QuietMisdreavus:must-use-reference, r=Manishearth
Add `must_use` to the Reference I'm a bit uncertain about the exact phrasing, but having it mentioned at all is probably better than before.
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@ -2071,6 +2071,9 @@ macro scope.
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trait of the same name. `{Self}` will be replaced with the type that is supposed
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to implement the trait but doesn't. To use this, the `on_unimplemented` feature gate
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must be enabled.
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- `must_use` - on structs and enums, will warn if a value of this type isn't used or
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assigned to a variable. You may also include an optional message by using
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`#[must_use = "message"]` which will be given alongside the warning.
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### Conditional compilation
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