[JavaScript] Distinguish the comma operator from comma punctuation. (#1551)

Author: Thomas Smith

JavaScript/JavaScript.sublime-syntax

@@ -1038,7 +1038,7 @@ contexts:
       scope: keyword.operator.arithmetic.js
       push: expression-begin
     - match: ','
-      scope: punctuation.separator.comma.js # TODO: Change to keyword.operator.comma.js ?
+      scope: keyword.operator.comma.js # Comma operator, not punctuation.
       push: expression-begin
 
   ternary-operator:

JavaScript/tests/syntax_test_js.js

@@ -1352,6 +1352,17 @@ var re = /^\/[^/]+/;
 //      ^ keyword.operator.arithmetic
  y      / ((x - 1) / -2);
 
+    1, 2;
+//   ^ keyword.operator.comma - punctuation
+
+    a;
+    [1, 2];
+//    ^ meta.sequence punctuation.separator.comma - meta.brackets - keyword
+
+    a
+    [1, 2];
+//    ^ meta.brackets keyword.operator.comma - meta.sequence - punctuation
+
 define(['common'], function(common) {
 //                 ^ meta.function.declaration
     var namedFunc = function() {