diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parallel/comprehension-throws.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parallel/comprehension-throws.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,27 @@
+load(libdir + "asserts.js");
+
+function buildComprehension() {
+  // Throws if elemental fun not callable
+  assertThrowsInstanceOf(function () {
+    var p = new ParallelArray([2,2], undefined);
+  }, TypeError);
+  assertThrowsInstanceOf(function () {
+    var p = new ParallelArray(2, /x/);
+  }, TypeError);
+  assertThrowsInstanceOf(function () {
+    var p = new ParallelArray(/x/, /x/);
+  }, TypeError);
+  assertThrowsInstanceOf(function () {
+    new ParallelArray([0xffffffff + 1], function() { return 0; });
+  }, RangeError);
+  assertThrowsInstanceOf(function () {
+    new ParallelArray(0xffffffff + 1, function() { return 0; });
+  }, RangeError);
+  assertThrowsInstanceOf(function () {
+    new ParallelArray([0xfffff, 0xffff], function() { return 0; });
+  }, RangeError);
+}
+
+// FIXME(bug 844887) throw correct exception
+// if (getBuildConfiguration().parallelJS)
+//   buildComprehension();