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: writer.go
    path of file: ./repos/rancher/pkg/codegen/buildconfig
    
    the code of the file until where you have to start completion: package main

import (
	"bytes"
	"errors"
	"fmt"
	"go/format"
	"io"
	"sort"
	"strings"
	"text/template"

	"golang.org/x/text/cases"
	"golang.org/x/text/language"
	"gopkg.in/yaml.v3"
)

type GoConstantsWriter struct {
	Input  io.Reader
	Output io.Writer
	Tmpl   *
    
func (f *GoConstantsWriter) load() error {
	if f.Input == nil {
		return errors.New("nil input")
	}
	b, err := io.ReadAll(f.Input)
	if err != nil {
		return fmt.Errorf("failed to read input: %w", err)
	}
	if len(b) == 0 {
		return errors.New("nothing was read")
	}
	if err := yaml.Unmarshal(b, &f.cfg); err != nil {
		return fmt.Errorf("failed to unmarshal raw YAML from input: %w", err)
	}
	return nil
}