diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Script-staticLevel.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Script-staticLevel.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,43 @@
+// Debugger.Script.prototype.staticLevel returns the script's static level.
+load(libdir + 'asserts.js');
+
+var g = newGlobal();
+var dbg = Debugger();
+var gw = dbg.addDebuggee(g);
+
+function test(expr, level) {
+    var log;
+    dbg.onDebuggerStatement = function (frame) {
+        log += 'd';
+        assertEq(frame.script.staticLevel, level);
+    };
+
+    print("Testing: " + expr);
+
+    log = '';
+    // The shell's 'evaluate' runs its argument as global code.
+    g.evaluate(expr);
+    assertEq(log, 'd');
+}
+
+
+test("debugger;", 0);
+test("(function () { debugger; })()", 1);
+test("(function () { (function () { debugger; })(); })()", 2);
+test("(function () { (function () { (function () { debugger; })(); })(); })()", 3);
+
+test("eval('debugger;');", 1);
+test("eval('eval(\\\'debugger;\\\');');", 2);
+test("evil = eval; eval('evil(\\\'debugger;\\\');');", 0); // I don't think it's evil at all!
+test("(function () { eval('debugger;'); })();", 2);
+test("evil = eval; (function () { evil('debugger;'); })();", 0);
+
+// Generators' expressions are within a synthesized function's body.
+test("((function () { debugger; })() for (x in [1])).next();", 2);
+test("(x for (x in ((function () { debugger; })(), [1]))).next();", 2);
+
+// The staticLevel accessor can't be assigned to.
+g.eval('function f() {}');
+var fw = gw.makeDebuggeeValue(g.f);
+assertThrowsInstanceOf(function () { "use strict"; fw.script.staticLevel = 10; },
+                       TypeError);