Comment 11 for bug 399938

Maybe it's not the same bug but it also occurs with other commands (still on that x64 box):

$ bzr log --line | grep '\[merge\]' | head -1 | cut -d: -f1
613
grep: write error: Broken pipe
$ bzr log --line | grep '\[merge\]' | cut -d: -f1 | head -1
613
$