if len(p.GoFiles)+len(p.CgoFiles)+len(p.TestGoFiles)+len(p.XTestGoFiles) == 0 {
                return p, &NoGoError{p.Dir}
        }

// NoGoError is the error used by Import to describe a directory                                                                                                                                                                        
// containing no buildable Go source files. (It may still contain                                                                                                                                                                       
// test files, files hidden by build tags, and so on.)                                                                                                                                                                                  
type NoGoError struct {
        Dir string
}