Template constraints in D

[Bill Baxter]

Walter Bright wrote:

> I wished to make the point that D constraints build on what one already 
> knows - how to write a D expression. Concepts, on the other hand, have a 
> major new syntax and semantic thing that must be learned. Perhaps I 
> expressed the point badly, do you have a suggestion?

The new comparison you put in there is definitely a change for the better.

--bb