typedef struct {
  int member;
  // [...]
} Record;

class Data {
  Record * records;
  // [...]
  static int method(const void * ptr);
};

int Data::method(const void * ptr) {
    Record * rec_1 = (Record *) ptr;
    return rec_1->member;
}

int Data::method(const void * ptr) {
    __typeof__(records) * rec_1 = (__typeof__(records) *) ptr;
    return rec_1->member;
}

error: request for member ‘member’ in ‘* rec_1’, which is of non-class type ‘Record*’