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digitalmars.D.bugs - version'd else-if

reply derick_eddington nospam.yashmoo.com writes:
DMD 0.125 on Linux.

: import std.stdio;
:
: void main (char[][] args)
: {
:       if (args.length = 2) {
:               writefln("2");
:       }
:       version (BUG) {
:               else if (args.length == 3) {
:                       writefln("3");
:               }
:       }
: }

$ dmd verelif.d
verelif.d(9): found 'else' instead of statement
verelif.d(13): unrecognized declaration

$ dmd -version=BUG verelif.d
verelif.d(9): found 'else' instead of statement
verelif.d(13): unrecognized declaration
Jun 01 2005
next sibling parent reply Derek Parnell <derek psych.ward> writes:
On Wed, 1 Jun 2005 07:56:16 +0000 (UTC),
derick_eddington nospam.yashmoo.com wrote:


 DMD 0.125 on Linux.
 
: import std.stdio;
:
: void main (char[][] args)
: {
:       if (args.length = 2) {
:               writefln("2");
:       }
:       version (BUG) {
:               else if (args.length == 3) {
:                       writefln("3");
:               }
:       }
: }
 
 $ dmd verelif.d
 verelif.d(9): found 'else' instead of statement
 verelif.d(13): unrecognized declaration
 
 $ dmd -version=BUG verelif.d
 verelif.d(9): found 'else' instead of statement
 verelif.d(13): unrecognized declaration



The docs say that the body of a version block must be valid D statements,
and 'else' never starts a valid D statement. So its not a bug.

Try rearranging it thus ...

 void main (char[][] args)
 {
       if (args.length == 2) {
               writefln("2");
       }
       else 
       version (BUG) {
               if (args.length == 3) {
                       writefln("3");
               }
       }
 }

-- 
Derek
Melbourne, Australia
1/06/2005 6:39:25 PM
Jun 01 2005
parent reply "Jarrett Billingsley" <kb3ctd2 yahoo.com> writes:
"Derek Parnell" <derek psych.ward> wrote in message 
news:g6j77wymnkft.9f9aw0m8symi$.dlg 40tude.net...

 Try rearranging it thus ...

 void main (char[][] args)
 {
       if (args.length == 2) {
               writefln("2");
       }
       else
       version (BUG) {
               if (args.length == 3) {
                       writefln("3");
               }
       }
 }



Might have to have an extra set of {} after the version statement - or else 
anything after the version statement, if BUG is not defined, will be the 
"else" statement!
Jun 02 2005
parent derick_eddington nospam.yashmoo.com writes:
In article <d7npko$27fp$1 digitaldaemon.com>, Jarrett Billingsley says...

"Derek Parnell" <derek psych.ward> wrote in message 
news:g6j77wymnkft.9f9aw0m8symi$.dlg 40tude.net...

 Try rearranging it thus ...

 void main (char[][] args)
 {
       if (args.length == 2) {
               writefln("2");
       }
       else
       version (BUG) {
               if (args.length == 3) {
                       writefln("3");
               }
       }
 }



Might have to have an extra set of {} after the version statement - or else 
anything after the version statement, if BUG is not defined, will be the 
"else" statement! 



I wondered about that too at first but it's not at all just textually including
like I was assuming before.  version() is ConditionalStatement which is a
Statement, and in this case it is always seen as the Statement of the 'else'.

For example:


 void main (char[][] args)
 {
       if (args.length == 2) {
               writefln("2");
       }
       else
       version (BUG) {
               if (args.length == 3) {
                       writefln("3");
               }
       }
       writefln("hmm");
 }






$ dmd verelif.d     # no -version=BUG
$ ./verelif
hmm
$ ./verelif abc
2
hmm
Jun 02 2005
prev sibling parent zwang <nehzgnaw gmail.com> writes:
derick_eddington nospam.yashmoo.com wrote:

 DMD 0.125 on Linux.
 
 : import std.stdio;
 :
 : void main (char[][] args)
 : {
 :       if (args.length = 2) {
 :               writefln("2");
 :       }
 :       version (BUG) {
 :               else if (args.length == 3) {
 :                       writefln("3");
 :               }
 :       }
 : }
 
 $ dmd verelif.d
 verelif.d(9): found 'else' instead of statement
 verelif.d(13): unrecognized declaration
 
 $ dmd -version=BUG verelif.d
 verelif.d(9): found 'else' instead of statement
 verelif.d(13): unrecognized declaration
 
 



This is not a bug.
Your sample code violates the syntax defined in
http://www.digitalmars.com/d/version.html

	ConditionalDeclaration:
	    Condition DeclarationBlock
	    Condition DeclarationBlock else DeclarationBlock

	DeclarationBlock:
	    Declaration
	    { Declarations }

	Declarations:
	    Declaration
	    Declaration Declarations

	ConditionalStatement:
	    Condition Statement
	    Condition Statement else Statement
	
	Condition:
	    VersionCondition
	    DebugCondition
	    StaticIfCondition
	    IfTypeCondition
Jun 01 2005