spec.functionName transformer: hasBinding(name) returns true for built-in globals, so we attempt to rename the binding but it doesn't exist so exits early, add a check that doesn't perform the renaming and instead uses the wrapper - fixes #1598

src/babel/transformation/helpers/name-method.js

@@ -20,7 +20,7 @@ var visitor = {
 
 var wrap = function (state, method, id, scope) {
   if (state.selfReference) {
-    if (scope.hasBinding(id.name)) {
+    if (scope.hasBinding(id.name) && !scope.hasGlobal(id.name)) {
       // we can just munge the local binding
       scope.rename(id.name);
     } else {

test/core/fixtures/transformation/spec.function-name/global/actual.js

@@ -0,0 +1,5 @@
+var test = {
+  setInterval: function(fn, ms) {
+    setInterval(fn, ms);
+  }
+};

test/core/fixtures/transformation/spec.function-name/global/expected.js

@@ -0,0 +1,17 @@
+"use strict";
+
+var test = {
+  setInterval: (function (_setInterval) {
+    function setInterval(_x, _x2) {
+      return _setInterval.apply(this, arguments);
+    }
+
+    setInterval.toString = function () {
+      return _setInterval.toString();
+    };
+
+    return setInterval;
+  })(function (fn, ms) {
+    setInterval(fn, ms);
+  })
+};