public void accept(@NotNull PsiElementVisitor visitor) {
   if (visitor instanceof HaskellVisitor) ((HaskellVisitor) visitor).visitCtypePragma(this);
   else super.accept(visitor);
 }
 public void accept(@NotNull HaskellVisitor visitor) {
   visitor.visitFileHeader(this);
 }
 public void accept(@NotNull HaskellVisitor visitor) {
   visitor.visitQtyconop(this);
 }