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-rw-r--r--js/src/jit-test/tests/arrow-functions/precedence-4.js6
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diff --git a/js/src/jit-test/tests/arrow-functions/precedence-4.js b/js/src/jit-test/tests/arrow-functions/precedence-4.js
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+++ b/js/src/jit-test/tests/arrow-functions/precedence-4.js
@@ -0,0 +1,6 @@
+// Funny case that looks kind of like default arguments isn't.
+
+var f = (msg='hi', w=window => w.alert(a, b)); // sequence expression
+assertEq(msg, 'hi');
+assertEq(typeof w, 'function');
+assertEq(f, w);