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stdout output missing, but redirecting works


I compiled a program yesterday which output some lines to stdout. It
appeared to be working. Running it today, I get nothing on stdout.
However, if I redirect stdout to a file, the correct output appears in
the file. E.g.

# no output
./foo
# "hello world" in bar
./foo > bar


In between yesterday and today, I've rebooted and run rebaseall, so
perhaps one of those is responsible for the change.

Any suggestions?

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