Your bug report

#7147: 24.0.50; M-: minibuffer completion chokes at `:'

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 7147@debbugs.gnu.org.

-- 
7147: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=7147
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