Use std::io::pipe once MSRV is 1.87 #1471
Description
This would allow getting rid of the tempfile dependency in the test framework, remove unsafe code for pipe2 and replace a couple of UnixStream::pair() with io::pipe().
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This would allow getting rid of the tempfile dependency in the test framework, remove unsafe code for pipe2 and replace a couple of UnixStream::pair() with io::pipe().