158030 2016-05-24 11:21:44 -0700 [ES6] Different errors during parsing ordinary function and arrow function 2016-06-27 19:39:45 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified NEW P2 Normal --- 1 gskachkov webkit-unassigned gskachkov saam ticaiolima ysuzuki oldest_to_newest 1195917 0 gskachkov 2016-05-24 11:21:44 -0700 It seems that we have different error message in case of errors in parsing of the function parameters >>> var arr = (a, ...last,)=> {return last;}; Unexpected token '...' >>> var f = function (a, ...last,) {return last;}; Unexpected token ','. Rest parameter should be the last parameter in a function declaration. 1205844 1 ticaiolima 2016-06-27 19:39:45 -0700 I think the report of ordinary functions more clear. I think we should give same syntax error to them. I am interested working in this =).