Why version() ?

[Ary Borenszweig]

Jason House escribió:
> Walter Bright Wrote:
> 
>    
>> 5. Why can't one 'version out' syntax that is not recognized by the 
>> compiler?
>>
>> The problem is that supporting this requires semantic analysis in order 
>> to successfully lex and parse the source code. Breaking this will make 
>> the lexing and parsing an order of magnitude harder for third party 
>> tools to do. If you need to 'comment out' a section of syntactically 
>> invalid code, use the /+ ... +/ nesting comment.
> 
> Would you be willing to introduce an alternative to /+ +/ which would be treated differently by the D1 and D2 compilers? Here are some examples with no attempt at creativity:
> beginD1 endD1
> D1 D1 (works like string delimiters)
> /D2 D2/

Why not have special versions like D1, D2, D3 for the compiler to treat 
them differently? If a version(DX) is found that is not the current's 
compiler version, it just consumes tokens (counting opening and closing 
of brackets, etc.) until the curly's close. Much like the asm statement.