Template constraints error messages using cputs()

[BCS]

Hello Don,

> pragma(msg) creates its output as part of its semantic pass. And
> that's a problem, because the need to deal with forward references
> means that the order in which symbols get the semantic pass run on
> them isn't defined. And the semantics of pragma(msg) aren't well
> defined, because it wasn't designed to be used in this way (it was
> intended to only allow string literals). So you get inconsistencies.

The solution there is to assume that pragma(msg) will be reordered and make 
each one atomic; compleat in it's own right rather than assume it works like 
printf.
 
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