fix compilation error

vm_suite.ce

@@ -4284,6 +4284,32 @@ run("closure set and get", function() {
   assert_eq(o.get(), 42, "overwrite")
 })
 
+run("closure write heap values visible to outer scope", function() {
+  var a = null
+  var b = null
+  var c = null
+  var d = null
+  var e = null
+  var f1 = function() { a = 42 }
+  var f2 = function() { b = true }
+  var f3 = function() { c = "hello" }
+  var f4 = function() { d = {x: 1} }
+  var f5 = function() { e = [1, 2] }
+  f1()
+  f2()
+  f3()
+  f4()
+  f5()
+  assert_eq(a, 42, "closure write number")
+  assert_eq(b, true, "closure write boolean")
+  assert_eq(c != null, true, "closure write text not null")
+  assert_eq(c, "hello", "closure write text value")
+  assert_eq(d != null, true, "closure write object not null")
+  assert_eq(d.x, 1, "closure write object property")
+  assert_eq(e != null, true, "closure write array not null")
+  assert_eq(e[0], 1, "closure write array element")
+})
+
 // ============================================================================
 // STRING COMPARISON OPERATORS
 // ============================================================================