[parser] report SyntaxError if rest parameter used in Setter MethodDefinition

test/message/rest-param-class-setter-strict.out

Index: test/message/rest-param-class-setter-strict.out
diff --git a/test/message/rest-param-class-setter-strict.out b/test/message/rest-param-class-setter-strict.out
new file mode 100644
index 0000000000000000000000000000000000000000..3296a0f2c8dcc7decb8cd64cd83288d4c44de6d7
--- /dev/null
+++ b/test/message/rest-param-class-setter-strict.out
@@ -0,0 +1,4 @@
+*%(basename)s:11: SyntaxError: Setter function argument must not be a rest parameter
+  set bad(...args) { _bad = args[0]; }
+         ^^^^^^^^^

[arv (Not doing code reviews), 2015/05/15 13:55:56]

The location here is a bit strange. Can it be improved to point at `...args`
instead of `(...args)`?

+SyntaxError: Setter function argument must not be a rest parameter