diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parallel/closure-eta-expand.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parallel/closure-eta-expand.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+load(libdir + "parallelarray-helpers.js");
+
+function testClosureCreationAndInvocation() {
+  var a = range(1, 65);
+  function etaadd1(v) { return (function (x) { return x+1; })(v); };
+  // eta-expansion is (or at least can be) treated as call with unknown target
+  for (var i in MODES) {
+    var m = a.mapPar(etaadd1, MODES[i]);
+    assertEq(m[1], 3); // (\x.x+1) 2 == 3
+  }
+}
+
+if (getBuildConfiguration().parallelJS)
+  testClosureCreationAndInvocation();