import
  "go/parser"
"go/token" 
  "go/ast" 
func HasMain(file string) (bool, error) {
fset := token.NewFileSet()
f, err := parser.ParseFile(fset, file, nil, 0)
if err != nil {
return false, err
  for _, dec := range f.Decls { 
 fd, ok := dec.(*ast.FuncDecl)
if ok && fd.Name.Name == "main" {
return true, nil 
 } 
 } 
  return false, nil
}