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4913fc07e0
This reportedly happens on CentOS 5.11. The real code will work fine;
this test is assuming that the unexported slice function will handle
the splice, but if pipe2 does not work then it doesn't. The relevant
code in internal/poll/splice_linux.go says "Falling back to pipe is
possible, but prior to 2.6.29 splice returns -EAGAIN instead of 0 when
the connection is closed."
Reviewed-on: https://go-review.googlesource.com/138838
From-SVN: r264793