golang get "file.go:func:line" vs code snippet

ffl.go

package main

import (
	"fmt"
	"path/filepath"
	"runtime"
)

func FFL() string {
	pc, f, l, _ := runtime.Caller(1)
	return fmt.Sprintf("%s:%s:%d", filepath.Base(f), runtime.FuncForPC(pc).Name(), l)
}

func main() {
	print(FFL())
}

ffl.json

{
	"ffl": {
		"description": "returns \"file:function:line\" of caller",
		"prefix": "ffl",
		"body": "func ffl() string {\n\tp, f, l, _ := runtime.Caller(1)\n\treturn fmt.Sprintf(\"%s:%s:%d\", filepath.Base(f), runtime.FuncForPC(p).Name(), l)\n}"
	},

	"ffl log variable content": {
		"prefix": "pv",
		"body": "fmt.Fprintf(os.Stderr, \"%s: ${1:var}: %#+v\\\\n\", ffl(), ${1:var})",
		"description": "Snippet for log.Printf() with variable content"
	},
}