measure: Improve wording of error message.
authorBen Pfaff <blp@cs.stanford.edu>
Fri, 15 Jan 2016 15:49:33 +0000 (07:49 -0800)
committerBen Pfaff <blp@cs.stanford.edu>
Fri, 15 Jan 2016 15:49:33 +0000 (07:49 -0800)
Suggested by Elias Estatistics <estatisticseu@gmail.com>.


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