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digitalmars.D.bugs - [Issue 5216] New: /+ parsed incorrectly in comments

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=5216

           Summary: /+ parsed incorrectly in comments
           Product: D
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: jmdavisProg gmx.com



PST ---
This fails to compile

void main()
{
    /+
    // /+
    +/
}


giving this error

test.d(7): unterminated /+ +/ comment
test.d(7): found 'EOF' when expecting '}' following compound statement


It seems to be fine if it's not within a /+ +/ block, but once it is, the //
comment is ignored, and since /+ is intended for commenting out code rather
than just comments, this is not good behavior. All /+ and +/ should be ignored
on lines where they are after //.

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Nov 14 2010
next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=5216


Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla digitalmars.com
         Resolution|                            |INVALID



16:53:36 PST ---
Commenting out code should properly be done using:

   version (none)
   {
   }

The only thing the /+ comments recognize are +/ and /+. They are working as
designed. They are not intended to recognize tokens or other comments.

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Nov 16 2010
prev sibling next sibling parent d-bugmail puremagic.com writes:
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PST ---
I could have sworn that the online docs said that one of the main reasons for
/+ +/ was to comment out code, but regardless, it's not like you usually run
into /+ or +/ inside of comments instead of delimiting them. I only ran into it
because I was working on the D lexer for Phobos and one of the comments had
them in it. The main issue is that they work as designed, so if this was as
intended, then that's fine.

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Nov 16 2010
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=5216


nfxjfg gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
                 CC|                            |nfxjfg gmail.com
         Resolution|INVALID                     |
           Severity|normal                      |enhancement





 Commenting out code should properly be done using:
 
    version (none)
    {
    }
 
 The only thing the /+ comments recognize are +/ and /+. They are working as
 designed. They are not intended to recognize tokens or other comments.


That's unintuitive and error prone. Also you can't stick version anywhere.
Obviously the design should be fixed.

Reopening as enhancement request.

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Nov 16 2010
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=5216


bearophile_hugs eml.cc changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bearophile_hugs eml.cc







 Commenting out code should properly be done using:
 
    version (none)
    {
    }
 
 The only thing the /+ comments recognize are +/ and /+. They are working as
 designed. They are not intended to recognize tokens or other comments.


 
 That's unintuitive and error prone. Also you can't stick version anywhere.
 Obviously the design should be fixed.
 
 Reopening as enhancement request.


Be more gentle. The current behaviour is not obviously bad.

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Nov 16 2010
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=5216


Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|                            |WONTFIX



01:08:25 PST ---

That's unintuitive and error prone.


I presume you mean the version(none). Unusual, yes. Unintuitive? How so? It's
documented. Error prone? I don't see how - there's no way to set "none" as a
version identifier.


Also you can't stick version anywhere.


It's not necessary to stick it anywhere. It works fine for large blocks of
code. For parts of an expression, /* */ works fine. It's hard to see an issue
about this.


Obviously the design should be fixed.


I don't think it's obvious wrong at all. It follows a simple rule, which I
believe is better than having an arbitrarily complex rule with hard to remember
special cases. Furthermore, if you do make a mistake with the /+ +/ nesting,
you get an inevitable compiler error message.

And lastly, the current behavior has existed for 10 years and this is the first
anyone has complained about it. Changing it would arbitrarily break existing
code and hence annoy people for a rather dubious benefit.

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Nov 17 2010