casting as char at CT fail

[Shammah Chancellor]

On 2013-11-28 03:40:25 +0000, Kenji Hara said:

> On Tuesday, 26 November 2013 at 23:31:16 UTC, bioinfornatics wrote:
>> Hi,
>> this time i have so many question about CT …
>> iws and ibuclaw help me for this.
>> 
>> I stuck currently about a cast at CT -> http://www.dpaste.dzfl.pl/1a28a22c
>> 
>> it seem this should works but not…
>> So if you confirm maybe a report is needed
>> 
>> thanks to everyone
> 
> I found two compiler issues:
> 
> https://d.puremagic.com/issues/show_bug.cgi?id=11627
> https://d.puremagic.com/issues/show_bug.cgi?id=11629
> 
> Kenji Hara

Kenji you are awesome!

Also,  I had got his code working to a point: 
http://www.dpaste.dzfl.pl/985a2f42  and got another compiler bug.

/opt/compilers/dmd2/include/std/range.d(4220): Error: Internal Compiler 
Error: CTFE literal Tuple(void, void)._expand_field_0
dmd: ctfeexpr.c:359: Expression* copyLiteral(Expression*): Assertion 
`0' failed.
Seems to happen at the end while trying to instantiate the enum.

I am having trouble turning it into a reduced test case.  Can't find 
the source of the problem.   Here's the full snippet: 
http://www.dpaste.dzfl.pl/fork/985a2f42

Thanks for looking into this!