1 files changed, 26 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/collections/Set-iterator-remove-1.js b/js/src/jit-test/tests/collections/Set-iterator-remove-1.js
new file mode 100644
index 0000000000..31ac12f1ac
--- /dev/null
+++ b/js/src/jit-test/tests/collections/Set-iterator-remove-1.js
@@ -0,0 +1,26 @@
+// A set iterator can cope with removing the current entry.
+
+function test(letters, toRemove) {
+    var set = new Set(letters);
+    toRemove = new Set(toRemove);
+
+    var leftovers = [...set].filter(x => !toRemove.has(x)).join("");
+
+    var log = "";
+    for (let x of set) {
+        log += x;
+        if (toRemove.has(x))
+            set.delete(x);
+    }
+    assertEq(log, letters);
+
+    var remaining = [...set].join("");
+    assertEq(remaining, leftovers);
+}
+
+test('a', 'a');    // removing the only entry
+test('abc', 'a');  // removing the first entry
+test('abc', 'b');  // removing a middle entry
+test('abc', 'c');  // removing the last entry
+test('abc', 'abc') // removing all entries
+