grunt-contrib-concat concat目标源映射选项不工作（windows）

在运行grunt concat时，控制台会说我的源映射是创build的，但是源映射在我的文件系统上不存在。

我的Gruntfile中的插件configuration：

grunt.config('concat',{ scripts: { src: [ grunt.config.get('pkg.src') + '/scripts/vendor/underscore*.js', grunt.config.get('pkg.src') + '/scripts/vendor/jquery*.js', grunt.config.get('pkg.src') + '/scripts/vendor/angular-*.js', grunt.config.get('pkg.src') + '/scripts/vendor/*.js', grunt.config.get('pkg.src') + '/scripts/source/main.js', grunt.config.get('pkg.src') + '/scripts/source/services/httpHelper.js', grunt.config.get('pkg.src') + '/scripts/source/**/*.js' ], dest: 'static/server/scripts/app.js', options: { sourceMap: true } }, styles: { src: [ grunt.config.get('pkg.src') + '/styles/vendor/**/*.css', grunt.config.get('pkg.src') + '/styles/source/**/*.css' ], dest: 'static/server/styles/app.css' }, }); 

控制台输出：

 C:\workspace\someproject>grunt concat Running "concat:scripts" (concat) task Source map static/server/scripts/app.js.map created. File static/server/scripts/app.js created. Running "concat:styles" (concat) task File static/server/styles/app.css created. Done, without errors. 

注意：我使用的是Windows 7，Node v0.12.0，Grunt v0.4.5，grunt-cli v0.1.13和grunt-contrib-concat 0.5.1。