type.go

package main

import (
	"fmt"
	"go/ast"
	"go/importer"
	"go/parser"
	"go/token"
	"go/types"
	"log"
)

func main() {
	const src = `package main
	import "fmt"
	func main() {
		n := 10
		fmt.Println(n)
	}`
	fs := token.NewFileSet()
	f, err := parser.ParseFile(fs, "main.go", src, 0)
	if err != nil {
		log.Fatal(err)
	}

	config := &types.Config{
		Importer: importer.Default(),
	}

	info := &types.Info{
		Defs: map[*ast.Ident]types.Object{},
	}

	_, err = config.Check("main", fs, []*ast.File{f}, info)
	if err != nil {
		log.Fatal(err)
	}

	it := types.Universe.Lookup("int").Type()
	for idnt, o := range info.Defs {
		if o != nil &&
			types.Identical(o.Type(), it) {
			fmt.Println(fs.Position(idnt.Pos()), idnt)
		}
	}
}