[fpc-devel] "case" with range stupidities

[Florian Klaempfl]

Daniël Mantione schrieb:
>> Another minor issue is that a type declaration like:
>>
>>    type
>>       My_Range = (2500 - 500) .. (2500 + 500);
>>
>> is not accepted (message similar to ";" expected, ".." found) and 
>> (basically the same declaration)
>>
>>    type
>>       My_Range = 2500 - 500 .. 2500 + 500;
>>
>> is. Sometimes I'd really like to add those parantheses just to make the 
>> intention more clear.
> 
> I think this is a parser limitation. I don't think it is a problem to 
> allow it.

It is a problem. It's simply an inconsitency of pascal. When the parser
encounters
type
  My_Range = (

it expects an enum declaration. Pascal is parsed without look ahead so
this can't be solved cleanly, just consider

in one unit
const
   a = 1;
   b = 2;

in another unit

type
   atype = (a) .. (b);

Only at the .. the compiler could detect that this is an ord type
declaration.