Bug 1204857 - Report an error if there's trailing garbage after parsing a module r=efaust

js/src/frontend/Parser.cpp

@@ -875,7 +875,10 @@ Parser<ParseHandler>::standaloneModule(HandleModuleObject module)
     TokenKind tt;
     if (!tokenStream.getToken(&tt, TokenStream::Operand))
         return null();
-    MOZ_ASSERT(tt == TOK_EOF);
+    if (tt != TOK_EOF) {
+        report(ParseError, false, null(), JSMSG_GARBAGE_AFTER_INPUT, "module", TokenKindToDesc(tt));
+        return null();
+    }
 
     if (!FoldConstants(context, &pn, this))
         return null();

js/src/jit-test/tests/modules/bug1204857.js

@@ -0,0 +1,2 @@
+// |jit-test| error: SyntaxError: unexpected garbage after module
+parseModule(("}"));