[D1] capitalize cannot be interpreted at CT

[BCS]

Hello Don,

> Ellery Newcomer wrote:
> 
>> On 07/21/2010 09:09 PM, strtr wrote:
>> 
>>> Could somebody please explain this error to me.
>>> 
>> evidently ctfe can't eat
>> 
>> foreach(i, dchar d; s){
>> }
>> Bleach. Make sure it's in bugzilla.
>> 
> CTFE currently doesn't work on *any* functions which are implemented
> in druntime, because it doesn't have access to their source code.
> 

Why don't they have access?

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