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As discussed in #15715, the POSIX specification specifies that attempting to open a FIFO in write-only mode when the FIFO has no readers will fail with -ENOENT. [skip ci] Test Plan: Read it Reviewers: hvr Subscribers: rwbarton, carter GHC Trac Issues: #15715 Differential Revision: https://phabricator.haskell.org/D5295
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