diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parser/yield-without-operand.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parser/yield-without-operand.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,22 @@
+// yield without an operand causes a warning. See bug 885463.
+
+load(libdir + "asserts.js");
+
+assertWarning(() => Function("yield"), SyntaxError,
+             "yield followed by EOF should cause a warning");
+assertWarning(() => Function("yield;"), SyntaxError,
+             "yield followed by semicolon should cause a warning");
+assertWarning(() => Function("yield\n  print('ok');"), SyntaxError,
+             "yield followed by newline should cause a warning");
+
+assertWarning(() => eval("(function () { yield; })"), SyntaxError,
+             "yield followed by semicolon in eval code should cause a warning");
+assertWarning(() => eval("(function () { yield })"), SyntaxError,
+             "yield followed by } in eval code should cause a warning");
+
+assertNoWarning(() => Function("yield 0;"),
+                "yield with an operand should be fine");
+assertNoWarning(() => Function("yield 0"),
+                "yield with an operand should be fine, even without a semicolon");
+
+print("\npassed - all those warnings are normal and there's no real way to suppress them");