1 files changed, 40 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/collections/Map-iterator-remove-1.js b/js/src/jit-test/tests/collections/Map-iterator-remove-1.js
new file mode 100644
index 0000000000..d138a4423d
--- /dev/null
+++ b/js/src/jit-test/tests/collections/Map-iterator-remove-1.js
@@ -0,0 +1,40 @@
+// A map iterator can cope with removing the current entry.
+
+function test(pairs) {
+    print(JSON.stringify(pairs));
+    var map = new Map(pairs);
+    
+    var all_keys = '';
+    var false_keys = '';
+    for (let [k, v] of map) {
+        all_keys += k;
+        if (!v)
+            false_keys += k;
+    }
+
+    var log = '';
+    for (let [k, remove] of map) {
+        log += k;
+        if (remove)
+            map.delete(k);
+    }
+    assertEq(log, all_keys);
+
+    var remaining_keys = [...map].map(([k]) => k).join('');
+    assertEq(remaining_keys, false_keys);
+}
+
+// removing the only entry
+test([['a', true]]);
+
+// removing the first entry
+test([['a', true], ['b', false], ['c', false]]);
+
+// removing a middle entry
+test([['a', false], ['b', true], ['c', false]]);
+
+// removing the last entry
+test([['a', false], ['b', false], ['c', true]]);
+
+// removing all entries
+test([['a', true], ['b', true], ['c', true]]);