Bug test for invalid RegExp group, e.g. (?X...)

tests/ecmascript/test-bug-regexp-noncapturing-parse.js

@@ -0,0 +1,25 @@
+/*
+ *  This test from https://github.com/kangax/compat-table succeeds but
+ *  should fail.
+ */
+
+/*===
+SyntaxError
+SyntaxError
+===*/
+
+try {
+    var t = eval('/(?P<name>a)(?P=name)/');
+    print(t);
+    print(t.test("aa"));
+} catch (e) {
+    print(e.name);
+}
+
+try {
+    // In General '(?' followed by something else than ':' is a SyntaxError.
+    var t = eval('/(?X)/');
+    print(t);
+} catch (e) {
+    print(e.name);
+}