static if on types like double, float

[Don Clugston]

Jarrett Billingsley wrote:
> "Daniel Keep" <daniel.keep.lists at gmail.com> wrote in message 
> news:e6p2l6$r1h$1 at digitaldaemon.com...
> 
>> You might be able to use ``static assert(false, "...");`` to show a
>> message, maybe not.  I know you can pass the message to the non-static
>> version, but I can't remember if the static one supports that.
> 
> Indeed you can! 

I've been trying to work out what is allowed in the message. You can 
concatenate char [] literals, and use .mangleof, but AFAICT, templates 
inside the message are not instantiated. (I'm trying to work out if it's 
possible to dump a template 'call stack' in the message).