bors c62ae87db2 Auto merge of #23206 - nagisa:print-io, r=alexcrichton
r? @alexcrichton or @aturon 

This still needs to somehow figure out how to avoid unstable warnings arising from the use of unstable functions. I tried to use `#[allow_internal_unstable]` but it still spits out warnings as far as I can see. @huonw (I think you implemented it) does `#[allow_internal_unstable]` not work for some reason or am I using it incorrectly?
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