Github user Jens-G commented on the pull request:
https://github.com/apache/thrift/pull/439#issuecomment-92505688
> . Sometimes they close automatically, and sometimes they do not, and I
have no idea why...
They are closed when the magic line "This closes <number>" is in the commit
message. If the committer does not add this (or forgets it) then nothing
happens.
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