diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testBug686274.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testBug686274.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+// Don't Baseline-compile the huge array literal with --baseline-eager
+// as it's slow, especially in debug builds.
+setJitCompilerOption("baseline.usecount.trigger", 2);
+
+function f(N) {
+    var body = "return [";
+    for (var i = 0; i < N-1; i++)
+        body += "1,";
+    body += "2]";
+    var f = new Function(body);
+    var arr = f();
+    assertEq(arr.length, N);
+    assertEq(arr[N-1], 2);
+}
+f(1000000);