https://d.puremagic.com/issues/show_bug.cgi?id=12306

           Summary: Struct Enums cannot be read at compile time
           Product: D
           Version: D2
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: jbinero@gmail.com


--- Comment #0 from Jeroen Bollen <jbinero@gmail.com> 2014-03-06 13:50:45 PST ---
Created an attachment (id=1337)
Example Code - "dmd main.d"

When a struct enum is defined like this, it's values cannot be read at compile
time.
        enum Point3D point = {x:1, y:1, z:1};
        int testArray[point.x][point.y][point.z]; // z Cannot be read at
compile time (will error 6 times)

Working (well, technically not working) code in attachment. Tested for both 32 bit and 64 bit on a Linux system.

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--- Comment #1 from Jeroen Bollen <jbinero@gmail.com> 2014-03-06 13:54:39 PST ---
(In reply to comment #0)
> Created an attachment (id=1337) [details]
> Example Code - "dmd main.d"
> 
> When a struct enum is defined like this, it's values cannot be read at compile
> time.
>         enum Point3D point = {x:1, y:1, z:1};
>         int testArray[point.x][point.y][point.z]; // z Cannot be read at
> compile time (will error 6 times)
> 
> Working (well, technically not working) code in attachment. Tested for both 32 bit and 64 bit on a Linux system.

Probably not important, but it errors 5 times and not 6. With adding and removing to the code I have found inconsistency in how many times it errors, and what variable it picks though.

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Vladimir Panteleev <thecybershadow@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |thecybershadow@gmail.com


--- Comment #2 from Vladimir Panteleev <thecybershadow@gmail.com> 2014-03-07 01:28:20 EET ---
Looks like the compiler parses the array declaration as an associative array (and conservatively assumes that "point.x" is a type), then when it realizes it is in fact a static array, it does not reparse the whole "point.x" expression correctly (it just looks at the last symbol, x). Making it clear that it is an expression, e.g. adding "+0", also fixes compilation.

Fixing this is not trivial as the expression that the compiler sees in the array index is not saved. I think the correct fix would be to switch the parsing order: Assume that the array "index" is an expression, then, if it resolves to a type, reinterpret the whole thing as an associative array.

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Kenji Hara <k.hara.pg@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |pull, rejects-valid


--- Comment #3 from Kenji Hara <k.hara.pg@gmail.com> 2014-03-13 19:59:42 PDT ---
https://github.com/D-Programming-Language/dmd/pull/3379

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--- Comment #4 from github-bugzilla@puremagic.com 2014-03-14 07:19:02 PDT ---
Commits pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/d6de735b9ac60e85b4fdd844f838fa5fb2bc0881 fix Issue 12306 - Struct Enums cannot be read at compile time

https://github.com/D-Programming-Language/dmd/commit/0edabb313e4170a62693b4e0f1f5336a5f000c86 Merge pull request #3379 from 9rnsr/fix12306

Issue 12306 - Struct Enums cannot be read at compile time

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Andrej Mitrovic <andrej.mitrovich@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |andrej.mitrovich@gmail.com
         Resolution|                            |FIXED


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