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fails:IO.popen reads from a read-only pipe
fails:IO.popen reads and writes to a read/write pipe
fails:IO.popen writes to a write-only pipe
fails:IO.popen allows the IO to be closed inside the block
fails:IO.popen starts returns a forked process if the command is -
fails:IO.popen yields an instance of a subclass when called on a subclass
fails:IO.popen returns an instance of a subclass when called on a subclass
fails:IO.popen waits for the child to finish
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