You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.go
    path of file: ./repos/go-ast-book/ch13/examples/01
    
    the code of the file until where you have to start completion: package main

import (
	"fmt"
	"go/ast"
	"go/parser"
	"go/token"
	"go/types"

	"golang.org/x/tools/go/ssa"
	"golang.org/x/tools/go/ssa/interp"
)

func main() {
	prog := NewProgram(map[string]string{
		"main": `
			package main

			func main() {
				for i := 0; i < 3; i++ {
					println(i, "hello chai20
    
			func (e errorString) Error() string { return "runtime error: " + string(e) }

			type Error interface {
				error
				RuntimeError()
			}
		`,
	})

	prog.LoadPackage("main")
	prog.LoadPackage("runtime")

	var ssaProg = ssa.NewProgram(prog.fset, ssa.SanityCheckFunctions)
	var ssaMainPkg *ssa.Package

	for name, pkg := range prog.pkgs {
		ssaPkg := ssaProg.CreatePackage(pkg, []*ast.File{prog.ast[name]}, prog.infos[name], true)
		if name == "main" {
			ssaMainPkg = ssaPkg
		}
	}
	ssaProg.Build()

	exitCode := interp.Interpret(
		ssaMainPkg, 0, &types.StdSizes{8, 8},
		"main", []string{},
	)
	if exitCode != 0 {
		fmt.Println("exitCode:", exitCode)
	}
}