gistfile1.txt

package main

import (
	"go/ast"
	"go/parser"
	"go/token"
	"go/format"
	"os"
	"reflect"
	
	"bytes"
	"fmt"
)

func main() {
	// src is the input for which we want to print the AST.
	src := 
`// +build !test

package main
func main() {
	v := []string{"constant"}
	for _, x := range v {
		
	}
}
`

	// Create the AST by parsing src.
	fset := token.NewFileSet() // positions are relative to fset
	f, err := parser.ParseFile(fset, "", src, parser.ParseComments)
	if err != nil {
		panic(err)
	}
	// Print the modified AST.
	var buf bytes.Buffer
	if err := format.Node(&buf, fset, f); err != nil {
		panic(err)
	}
	fmt.Printf("%s", buf.Bytes())

	// Print the AST.
	ast.Print(fset, f)

	ast.Fprint(os.Stdout, fset, f, func(name string, value reflect.Value) bool {
		if ast.NotNilFilter(name, value) {
			return value.Type().String() != "*ast.Object"
		}
		return false
	})
}