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: func.go
    path of file: ./repos/td/telegram/query/internal/genutil
    
    the code of the file until where you have to start completion: package genutil

import (
	"go/types"

	"golang.org/x/tools/go/packages"
)

// Func is a function representation.
type Func struct {
	Sig  *types.Signature
	Decl *types.Func
}

// Results returns function results.
func (f Func) Results() *types.Tuple {
	return f.Sig.Results()
}

// Args returns function arguments.
func (f Func) Args() *types.Tuple
    
func Funcs(pkg *packages.Package, keep func(f Func) bool) []Func {
	var r []Func

	for _, def := range pkg.TypesInfo.Defs {
		if def == nil {
			continue
		}

		f, ok := def.(*types.Func)
		if !ok {
			continue
		}

		sig, ok := f.Type().(*types.Signature)
		if !ok {
			continue
		}
		repr := Func{
			Sig:  sig,
			Decl: f,
		}

		if keep(repr) {
			r = append(r, repr)
		}
	}

	return r
}