AST から Go ソースコードを生成するには?

<code class="go">package main

import (
        "go/parser"
        "go/printer"
        "go/token"
        "os"
)

func main() {
        // src represents the input source code for which we want to print the AST.
        src := `
package main
func main() {
        println("Hello, World!")
}
`

        // Create the AST by parsing src.
        fset := token.NewFileSet() // positions are relative to fset
        f, err := parser.ParseFile(fset, "", src, 0)
        if err != nil {
                panic(err)
        }

        printer.Fprint(os.Stdout, fset, f)

}</code>

package main

func main() {
        println("Hello, World!")
}