diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_3/LexicalConventions/7.8.3-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_3/LexicalConventions/7.8.3-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+var BUGNUMBER = 523401;
+var summary = 'identifier starts immediately after numeric literal';
+var expect = "SyntaxError: identifier starts immediately after numeric literal";
+var actual;
+
+printBugNumber(BUGNUMBER);
+printStatus(summary);
+
+try {
+    eval("actual = 0in [1]");
+} catch (e) {
+    actual = e;
+}
+actual = '' + actual;
+
+reportCompare(expect, actual, summary);
+
+printStatus("All tests passed!");