Tidy _resolveFilename

lib/module.js

@@ -276,18 +276,16 @@ Module._load = function(request, parent, isMain) {
     debug('Module._load REQUEST  ' + (request) + ' parent: ' + parent.id);
   }
 
-  var resolved = Module._resolveFilename(request, parent);
-  var id = resolved[0];
-  var filename = resolved[1];
+  var filename = Module._resolveFilename(request, parent);
 
   var cachedModule = Module._cache[filename];
   if (cachedModule) {
     return cachedModule.exports;
   }
 
-  if (NativeModule.exists(id)) {
+  if (NativeModule.exists(filename)) {
     // REPL is a special case, because it needs the real require.
-    if (id == 'repl') {
+    if (filename == 'repl') {
       var replModule = new Module('repl');
       replModule._compile(NativeModule.getSource('repl'), 'repl.js');
       NativeModule._cache.repl = replModule;
@@ -295,10 +293,10 @@ Module._load = function(request, parent, isMain) {
     }
 
     debug('load native module ' + request);
-    return NativeModule.require(id);
+    return NativeModule.require(filename);
   }
 
-  var module = new Module(id, parent);
+  var module = new Module(filename, parent);
 
   if (isMain) {
     process.mainModule = module;
@@ -318,7 +316,7 @@ Module._load = function(request, parent, isMain) {
 
 Module._resolveFilename = function(request, parent) {
   if (NativeModule.exists(request)) {
-    return [request, request];
+    return request;
   }
 
   var resolvedModule = Module._resolveLookupPaths(request, parent);
@@ -333,8 +331,7 @@ Module._resolveFilename = function(request, parent) {
   if (!filename) {
     throw new Error("Cannot find module '" + request + "'");
   }
-  id = filename;
-  return [id, filename];
+  return filename;
 };
 
 
@@ -374,7 +371,7 @@ Module.prototype._compile = function(content, filename) {
   }
 
   require.resolve = function(request) {
-    return Module._resolveFilename(request, self)[1];
+    return Module._resolveFilename(request, self);
   };
 
   Object.defineProperty(require, 'paths', { get: function() {