This bug could exist in the compiler, the spec, or my brain, depending on how you look at it. :)

Should this be legal?

    int main() {
        if (true) {
            printf("tautology is neat");
        }
        version (None) {
            else { // line 6
                printf("But paradox makes for a better screenplay");
            }
        }
        return 0; // line 10
    }

The error is

    test.d(6): found 'else' instead of statement
    test.d(10): Declaration expected, not 'return'

    test.d(11): unrecognized declaration

 -- andy

In article <cdjsdn$1r1o$1@digitaldaemon.com>, Andy Friesen says...
>
>This bug could exist in the compiler, the spec, or my brain, depending on how you look at it. :)
>
>Should this be legal?
>
>     int main() {
>         if (true) {
>             printf("tautology is neat");
>         }
>         version (None) {
>             else { // line 6
>                 printf("But paradox makes for a better screenplay");
>             }
>         }
>         return 0; // line 10
>     }

I would say no.  Whether or not "None" is defined, the code is not syntactically correct.  This is a good example of why language features such as version are much better than preprocessor macros :)

>The error is
>
>     test.d(6): found 'else' instead of statement
>     test.d(10): Declaration expected, not 'return'
>     test.d(11): unrecognized declaration

Seems reasonable.  The misplaced "else" clause is confusing the compiler.  I'd ignore all errors after the first.


Sean

'else' is also allowed in the context of 'version'.

  version(Win32) {
    // Windows code
  }
  else {
    // code for real OS's
  }


Andy Friesen wrote:

> This bug could exist in the compiler, the spec, or my brain, depending on how you look at it. :)
> 
> Should this be legal?
> 
>      int main() {
>          if (true) {
>              printf("tautology is neat");
>          }
>          version (None) {
>              else { // line 6
>                  printf("But paradox makes for a better screenplay");
>              }
>          }
>          return 0; // line 10
>      }
> 
> The error is
> 
>      test.d(6): found 'else' instead of statement
>      test.d(10): Declaration expected, not 'return'
> 
>      test.d(11): unrecognized declaration
> 
>   -- andy

Andy Friesen wrote:

<snip>
> Should this be legal?
> 
>     int main() {
>         if (true) {
>             printf("tautology is neat");
>         }
>         version (None) {
>             else { // line 6
>                 printf("But paradox makes for a better screenplay");
>             }
>         }
>         return 0; // line 10
>     }
<snip>

No.  But this should:

    int main() {
        if (true) {
            printf("tautology is neat");
        }
        else version (None) {
            printf("But paradox makes for a better screenplay");
        }
        return 0;
    }

I've noticed in the spec that a literal if(0) is supposed to lead to 'conditional' _compilation_, but is it the same with if(true)?

Stewart.

-- 
My e-mail is valid but not my primary mailbox, aside from its being the unfortunate victim of intensive mail-bombing at the moment.  Please keep replies on the 'group where everyone may benefit.

In article <cdlfl4$2hu7$1@digitaldaemon.com>, Stewart Gordon says...
>
>Andy Friesen wrote:
>
><snip>
>> Should this be legal?
>> 
>>     int main() {
>>         if (true) {
>>             printf("tautology is neat");
>>         }
>>         version (None) {
>>             else { // line 6
>>                 printf("But paradox makes for a better screenplay");
>>             }
>>         }
>>         return 0; // line 10
>>     }
><snip>
>
>No.  But this should:
>
>     int main() {
>         if (true) {
>             printf("tautology is neat");
>         }
>         else version (None) {
>             printf("But paradox makes for a better screenplay");
>         }
>         return 0;
>     }

I don't know if the other versions should work, but this version does:

#int main() {
#    if (true) {
#        printf("tautology is neat");
#    }
#    else {
#        version (None) {
#            printf("But paradox makes for a better screenplay");
#        }
#    }
#    return 0;
#}


Hope that helps some.

>
>I've noticed in the spec that a literal if(0) is supposed to lead to 'conditional' _compilation_, but is it the same with if(true)?
>
>Stewart.
>
>-- 
>My e-mail is valid but not my primary mailbox, aside from its being the unfortunate victim of intensive mail-bombing at the moment.  Please keep replies on the 'group where everyone may benefit.

jcc7

J C Calvarese wrote:

> I don't know if the other versions should work, but this version does:
> 
> #int main() {
> #    if (true) {
> #        printf("tautology is neat");
> #    }
> #    else {
> #        version (None) {
> #            printf("But paradox makes for a better screenplay");
> #        }    #    }
> #    return 0;
> #}
> 
> 
> Hope that helps some.

Sort of, but not really.  I came across the 'bug' as a result of a little source code preprocessing app.  (converting DMD to D)

Apparently, DMD sets higher standards than the ones it follows. ;)

 -- andy

"Cabal" <cabalN05P4M@myrealbox.com> escribió en el mensaje
news:cdl5hf$2cl3$1@digitaldaemon.com
| 'else' is also allowed in the context of 'version'.
|
|   version(Win32) {
|     // Windows code
|   }
|   else {
|     // code for real OS's
|   }
|

I think that's completely different to what Andy wanted to do.



|
| Andy Friesen wrote:
|
|| This bug could exist in the compiler, the spec, or my brain, depending
|| on how you look at it. :)
||
|| Should this be legal?
||
||      int main() {
||          if (true) {
||              printf("tautology is neat");
||          }
||          version (None) {
||              else { // line 6
||                  printf("But paradox makes for a better screenplay");
||              }
||          }
||          return 0; // line 10
||      }
||
|| The error is
||
||      test.d(6): found 'else' instead of statement
||      test.d(10): Declaration expected, not 'return'
||
||      test.d(11): unrecognized declaration
||
||   -- andy


-----------------------
Carlos Santander Bernal

On Tue, 20 Jul 2004 12:43:48 -0700, Andy Friesen wrote:

> This bug could exist in the compiler, the spec, or my brain, depending on how you look at it. :)
> 
> Should this be legal?
> 
>      int main() {
>          if (true) {
>              printf("tautology is neat");
>          }
>          version (None) {
>              else { // line 6
>                  printf("But paradox makes for a better screenplay");
>              }
>          }
>          return 0; // line 10
>      }
> 
> The error is
> 
>      test.d(6): found 'else' instead of statement
>      test.d(10): Declaration expected, not 'return'
> 
>      test.d(11): unrecognized declaration
> 
>   -- andy

I suspect this is how it is supposed to be written ... <code>

int main() {
    version (None) {
        if (true) {
            printf("tautology is neat");
        }
        else { // line 6
            printf("But paradox makes for a better screenplay");
        }
    }
    else
    {
        if (true) {
            printf("tautology is neat");
        };
    }
    return 0; // line 10
}

</code>
-- 
Derek
Melbourne, Australia
22/Jul/04 2:43:52 PM

On Thu, 22 Jul 2004 14:44:32 +1000, Derek Parnell <derek@psych.ward> wrote:
> On Tue, 20 Jul 2004 12:43:48 -0700, Andy Friesen wrote:
>
>> This bug could exist in the compiler, the spec, or my brain, depending
>> on how you look at it. :)
>>
>> Should this be legal?
>>
>>      int main() {
>>          if (true) {
>>              printf("tautology is neat");
>>          }
>>          version (None) {
>>              else { // line 6
>>                  printf("But paradox makes for a better screenplay");
>>              }
>>          }
>>          return 0; // line 10
>>      }
>>
>> The error is
>>
>>      test.d(6): found 'else' instead of statement
>>      test.d(10): Declaration expected, not 'return'
>>
>>      test.d(11): unrecognized declaration
>>
>>   -- andy
>
> I suspect this is how it is supposed to be written ..
> <code>
>
> int main() {
>     version (None) {
>         if (true) {
>             printf("tautology is neat");
>         }
>         else { // line 6
>             printf("But paradox makes for a better screenplay");
>         }
>     }
>     else
>     {
>         if (true) {
>             printf("tautology is neat");
>         };
>     }
>     return 0; // line 10
> }
>
> </code>

Yeah.. but that is somewhat more verbose than the original.
Is this equivalent to the original?

void main() {
  if (true) {
    printf("tautology is neat");
  }
  else {
    version (None) {
      printf("But paradox makes for a better screenplay");
    }
  }
}

Regan.

-- 
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/

On Thu, 22 Jul 2004 17:12:02 +1200, Regan Heath wrote:

> On Thu, 22 Jul 2004 14:44:32 +1000, Derek Parnell <derek@psych.ward> wrote:
>> On Tue, 20 Jul 2004 12:43:48 -0700, Andy Friesen wrote:
>>
>>> This bug could exist in the compiler, the spec, or my brain, depending on how you look at it. :)
>>>
>>> Should this be legal?
>>>
>>>      int main() {
>>>          if (true) {
>>>              printf("tautology is neat");
>>>          }
>>>          version (None) {
>>>              else { // line 6
>>>                  printf("But paradox makes for a better screenplay");
>>>              }
>>>          }
>>>          return 0; // line 10
>>>      }
>>>
>>> The error is
>>>
>>>      test.d(6): found 'else' instead of statement
>>>      test.d(10): Declaration expected, not 'return'
>>>
>>>      test.d(11): unrecognized declaration
>>>
>>>   -- andy
>>
>> I suspect this is how it is supposed to be written .. <code>
>>
>> int main() {
>>     version (None) {
>>         if (true) {
>>             printf("tautology is neat");
>>         }
>>         else { // line 6
>>             printf("But paradox makes for a better screenplay");
>>         }
>>     }
>>     else
>>     {
>>         if (true) {
>>             printf("tautology is neat");
>>         };
>>     }
>>     return 0; // line 10
>> }
>>
>> </code>
> 
> Yeah.. but that is somewhat more verbose than the original. Is this equivalent to the original?
> 
> void main() {
>    if (true) {
>      printf("tautology is neat");
>    }
>    else {
>      version (None) {
>        printf("But paradox makes for a better screenplay");
>      }
>    }
> }
> 
> Regan.

Oh your code is much neater. I forgot that "else{}" is a useful construct.
-- 
Derek
Melbourne, Australia
22/Jul/04 3:37:47 PM