diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testBug895774.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testBug895774.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+var g1 = newGlobal();
+var g2 = newGlobal();
+g1.eval("function f1() { debugger; evaluate('debugger', {newContext:true}) }");
+g2.eval("function f2() { f1(); assertEq(Number(this), 42) }");
+g2.f1 = g1.f1;
+
+var dbg = new Debugger(g1,g2);
+dbg.onDebuggerStatement = function(frame) {
+    var target = frame.older;
+    dbg.onDebuggerStatement = function(frame) {
+        assertEq(Number(target.this.unsafeDereference()), 42);
+    }
+}
+g2.f2.call(42);