test.go

package main

import (
	"fmt"

	mruby "github.com/mitchellh/go-mruby"
)

func main() {
	mrb := mruby.NewMrb()
	defer mrb.Close()

	proc, _ := mrb.LoadString(`
  def foo
    Proc.new do
      puts 1
    end
  end
  `)

	val, err := mrb.Run(proc, nil)

	fmt.Printf("%#v, %#v", val, err)
}