1 files changed, 9 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/collections/Map-constructor-3.js b/js/src/jit-test/tests/collections/Map-constructor-3.js
new file mode 100644
index 000000000..601a76188
--- /dev/null
+++ b/js/src/jit-test/tests/collections/Map-constructor-3.js
@@ -0,0 +1,9 @@
+// Map can take an argument that is an array of singleton arrays.
+
+var arr = [["a"], ["b"], ["c"]];
+var m = new Map(arr);
+assertEq(m.size, 3);
+for (var [k, _] of arr) {
+    assertEq(m.has(k), true);
+    assertEq(m.get(k), undefined);
+}