diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/asm.js/testUseAsmWarnings.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/asm.js/testUseAsmWarnings.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+load(libdir + "asm.js");
+
+assertAsmDirectiveFail("'use asm'");
+assertAsmDirectiveFail("eval('\"use asm\";');");
+assertAsmDirectiveFail("{ eval('\"use asm\";'); }");
+assertAsmDirectiveFail("if (Math) { 'use asm'; }");
+assertAsmDirectiveFail("function f(){ { 'use asm'; } }");
+assertAsmDirectiveFail("function f(){ ; 'use asm'; } }");
+assertAsmDirectiveFail("function f(){ 1; 'use asm'; } }");
+assertAsmDirectiveFail("function f(){ var x; 'use asm'; } }");
+assertAsmDirectiveFail("function f(){ if (Math) { 'use asm'; } }");
+assertAsmDirectiveFail("(function(){ eval('\"use asm\";') })()");
+assertAsmDirectiveFail("new Function('{\"use asm\";}')");
+assertAsmDirectiveFail("new Function('if (Math){\"use asm\";}')");