mark std::str::replacen and std::str::replace as #[must_use].
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@ -96,6 +96,7 @@
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#![feature(dropck_eyepatch)]
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#![feature(exact_size_is_empty)]
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#![feature(fmt_internals)]
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#![feature(fn_must_use)]
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#![feature(from_ref)]
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#![feature(fundamental)]
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#![feature(lang_items)]
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