Extra diagnosis for gevent install failures on Appveyor
Extra diagnosis for gevent install failures on Appveyor

nedbat/coveragepy,hugovk/coveragepy,hugovk/coveragepy,nedbat/coveragepy,hugovk/coveragepy,blueyed/coveragepy,hugovk/coveragepy,nedbat/coveragepy,blueyed/coveragepy,hugovk/coveragepy,blueyed/coveragepy,nedbat/coveragepy,blueyed/coveragepy,nedbat/coveragepy,blueyed/coveragepy