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Rollup merge of #89693 - jkugelman:must-use-stdin-stdout-stderr-locks…
…, r=joshtriplett Add #[must_use] to stdin/stdout/stderr locks Affected methods: ```rust std::io fn stdin_locked() -> StdinLock<'static>; std::io::Stdin fn lock(&self) -> StdinLock<'_>; std::io fn stdout_locked() -> StdoutLock<'static>; std::io::Stdout fn lock(&self) -> StdoutLock<'_>; std::io fn stderr_locked() -> StderrLock<'static>; std::io::Stderr fn lock(&self) -> StderrLock<'_>; ``` Parent issue: #89692
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