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Don't initialize stdout during io cleanup #119394

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DaniPopes wants to merge 1 commit into rust-lang:master from DaniPopes:simpler-stdio-cleanup

Commits on Dec 28, 2023

Don't initialize stdout during io cleanup

Slightly simplify the `std::io::cleanup` code by using `OnceCell::get` instead
of checking initialization manually with `get_or_init`.

This also has the consequence of not initializing stdout with an empty buffer
if it hasn't been already, but I believe this is inconsequential given that
this code only runs at process exit.

DaniPopes committed Dec 28, 2023