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: query.go
    path of file: ./repos/buildkit/vendor/github.com/grpc-ecosystem/grpc-gateway/v2/runtime
    
    the code of the file until where you have to start completion: package runtime

import (
	"errors"
	"fmt"
	"net/url"
	"regexp"
	"strconv"
	"strings"
	"time"

	"github.com/grpc-ecosystem/grpc-gateway/v2/utilities"
	"google.golang.org/grpc/grpclog"
	"google.golang.org/protobuf/encoding/protojson"
	"google.golang.org/protobuf/proto"
	"google.golang.org/protobuf/reflect/protoreflect"
	"google.go
    
func populateMapField(fieldDescriptor protoreflect.FieldDescriptor, mp protoreflect.Map, values []string) error {
	if len(values) != 2 {
		return fmt.Errorf("more than one value provided for key %q in map %q", values[0], fieldDescriptor.FullName())
	}

	key, err := parseField(fieldDescriptor.MapKey(), values[0])
	if err != nil {
		return fmt.Errorf("parsing map key %q: %w", fieldDescriptor.FullName().Name(), err)
	}

	value, err := parseField(fieldDescriptor.MapValue(), values[1])
	if err != nil {
		return fmt.Errorf("parsing map value %q: %w", fieldDescriptor.FullName().Name(), err)
	}

	mp.Set(key.MapKey(), value)

	return nil
}