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-rw-r--r--js/src/jit-test/tests/collections/Map-constructor-2.js6
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diff --git a/js/src/jit-test/tests/collections/Map-constructor-2.js b/js/src/jit-test/tests/collections/Map-constructor-2.js
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index 000000000..b80a171d8
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+++ b/js/src/jit-test/tests/collections/Map-constructor-2.js
@@ -0,0 +1,6 @@
+// The Map constructor can take an argument that is an array of pairs.
+
+var arr = [["zero", 0], ["one", 1], ["two", 2]];
+var m = new Map(arr);
+for (var [k, v] of arr)
+ assertEq(m.get(k), v);