diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parallel/Array-scanPar-one.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parallel/Array-scanPar-one.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+function testScanOne() {
+  function f(v, p) { throw "This should never be called."; }
+  var p = [1];
+  var s = p.scanPar(f);
+  assertEq(s[0], 1);
+  assertEq(s[0], p.reducePar(f));
+}
+
+if (getBuildConfiguration().parallelJS)
+  testScanOne();