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diff --git a/js/src/jit-test/tests/debug/Environment-03.js b/js/src/jit-test/tests/debug/Environment-03.js
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+++ b/js/src/jit-test/tests/debug/Environment-03.js
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+// Test that getting a function's environment can unlazify scripts.
+
+var g = newGlobal();
+g.eval('function f() { }');
+var dbg = new Debugger;
+var gw = dbg.makeGlobalObjectReference(g);
+var fw = gw.getOwnPropertyDescriptor('f').value;
+gc();
+dbg.addDebuggee(g);
+var fenv = fw.environment;