diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Environment-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Environment-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+// A live Environment can observe the new variables introduced by ES5 non-strict direct eval.
+
+var g = newGlobal();
+g.eval("var x = 'global'; function f(s) { h(); eval(s); h(); }");
+g.eval("function h() { debugger; }");
+var dbg = Debugger(g);
+var env = undefined;
+var hits = 0;
+dbg.onDebuggerStatement = function (hframe) {
+    if (env === undefined) {
+        // First debugger statement.
+        env = hframe.older.environment;
+        assertEq(env.find("x") !== env, true);
+        assertEq(env.names().indexOf("x"), -1);
+    } else {
+        // Second debugger statement, post-eval.
+        assertEq(env.find("x"), env);
+        assertEq(env.names().indexOf("x") >= 0, true);
+    }
+    hits++;
+};
+g.f("var x = 'local';");
+assertEq(hits, 2);