type coderMessageInfo … type coderFieldInfo … func (mi *MessageInfo) makeCoderMethods(t reflect.Type, si structInfo) { … } // getUnknownBytes returns a *[]byte for the unknown fields. // It is the caller's responsibility to check whether the pointer is nil. // This function is specially designed to be inlineable. func (mi *MessageInfo) getUnknownBytes(p pointer) *[]byte { … } // mutableUnknownBytes returns a *[]byte for the unknown fields. // The returned pointer is guaranteed to not be nil. func (mi *MessageInfo) mutableUnknownBytes(p pointer) *[]byte { … }