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: none.go
    path of file: ./repos/corteza/server/vendor/github.com/golang-jwt/jwt/v4
    
    the code of the file until where you have to start completion: package jwt

// SigningMethodNone implements the none signing method.  This is required by the spec
// but you probably should never use it.
var SigningMethodNone *signingMethodNone

co
    
func init() {
	SigningMethodNone = &signingMethodNone{}
	NoneSignatureTypeDisallowedError = NewValidationError("'none' signature type is not allowed", ValidationErrorSignatureInvalid)

	RegisterSigningMethod(SigningMethodNone.Alg(), func() SigningMethod {
		return SigningMethodNone
	})
}