deque: add a module docstring #5481
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bors
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oli-obk
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question_mark: don't add `as_ref()` for a call expression If a call returns a `!Copy` value, it does so regardless of whether `as_ref()` is added. For example, `foo.into_option().as_ref()?` can be simplified to `foo.into_option()?`. --- changelog: Improved `question_mark` lint suggestion so that it doesn't add redundant `as_ref()`
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