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diff --git a/js/src/jit-test/tests/debug/onExceptionUnwind-resumption-01.js b/js/src/jit-test/tests/debug/onExceptionUnwind-resumption-01.js
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+++ b/js/src/jit-test/tests/debug/onExceptionUnwind-resumption-01.js
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+// Check that an onExceptionUnwind hook can force a frame to return a value early.
+
+var g = newGlobal();
+var dbg = Debugger(g);
+dbg.onExceptionUnwind = function (frame, exc) {
+ return { return:"sproon" };
+};
+g.eval("function f() { throw 'ksnife'; }");
+assertEq(g.f(), "sproon");