Add m-esr52 at 52.6.0

1 files changed, 61 insertions, 0 deletions

diff --git a/js/src/tests/ecma_5/Array/splice-suppresses-unvisited-indexes.js b/js/src/tests/ecma_5/Array/splice-suppresses-unvisited-indexes.js
new file mode 100644
index 000000000..717116fa0
--- /dev/null
+++ b/js/src/tests/ecma_5/Array/splice-suppresses-unvisited-indexes.js
@@ -0,0 +1,61 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 668024;
+var summary =
+  'Array.prototype.splice, when it deletes elements, should make sure any ' +
+  'deleted but not visited elements are suppressed from subsequent enumeration';
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+var arr = [0, 1, 2, 3, 4, 5, , 7];
+
+var seen = [];
+var sawOneBeforeThree = true;
+for (var p in arr)
+{
+  if (p === "1")
+  {
+    // The order of enumeration of properties is unspecified, so technically,
+    // it would be kosher to enumerate "1" last, say, such that all properties
+    // in the array actually were enumerated, including an index which splice
+    // would delete.  Don't flag that case as a failure.  (SpiderMonkey doesn't
+    // do this, and neither do any of the other browser engines, but it is
+    // permissible behavior.)
+    if (seen.indexOf("3") >= 0)
+    {
+      sawOneBeforeThree = false;
+      break;
+    }
+
+    arr.splice(2, 3);
+  }
+
+  seen.push(p);
+}
+
+if (sawOneBeforeThree)
+{
+  // ES5 12.6.4 states:
+  //
+  //   If a property that has not yet been visited during enumeration is
+  //   deleted, then it will not be visited.
+  //
+  // So if we haven't seen "3" by the time we see "1", the splice call above
+  // will delete "3", and therefore we must not see it.
+  assertEq(seen.indexOf("3"), -1);
+}
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");