In C you can do something like
switch(x) {
  case 'a':
  case 'b': 
    printf("something");
  break;
  case 'c': 
    printf("else");
  break;
}
while in Delphi I tried both
 case x of
   'a': 
   'b': writeln('something');
   'c': writeln('else');
 end;
and
 case x of
   ['a','b']: writeln('something');
   'c': writeln('else');
 end;
but both of them do not work.
I though of different solutions, e.g. writing a procedure and call it both for 'a' and for 'b', but I was wondering if there was a better solution. I could also use a goto, like this:
 case x of
   'a': goto labelCaseB;
   'b': begin
          labelCaseB:
          writeln('something');
        end;
   'c': writeln('else');
 end;
and it works perfectly, but what is the "standard" solution for the fall through in the case statement in Delphi language?
Of course, my actual case is far more complicated: in the example, I would have used an if-else ;)
Delphi does not have fall through in case statements. It is one of the major differences between C and Delphi. But in your particular case (sorry about the pun) you can write
 case x of
   'a','b': begin
          writeln('something');
        end;
   'c': writeln('else');
 end;
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