User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:51.0) Gecko/20100101 Firefox/51.0 Build ID: 20161215085501 Steps to reproduce: 1. Open the scratchpad. 2. Enter: var f = x => x * 2; 3. Hit "Pretty Print" Actual results: the function is converted to: var f = x = > x * 2; Expected results: There shouldn't be a space in the arrow: =>, not = >.