std.unittests for (final?) review

[Michel Fortin]

I'm not sold on the concept. The whole point of this module seems to 
offer a way to replace the built-in assertion mechanism with a 
customized one, with the sole purpose of giving better error messages. 
So we're basically encouraging the use of:

	assertPredicate!"a > b"(a, b, "message");

instead of:

	assert(a > b, "message");

It looks like an uglification of the language to me.

I agree that getting better error messages is important (very important 
in fact), but keeping the code clean is important too. If the built-in 
assert doesn't give us good enough error messages, perhaps it's the 
built-in assert that should be improved. The compiler could give the 
values on both side of the operator to the assertion handler, which 
would in turn print values and operator as part of the error message.

So to me this module is a temporary fix until the compiler is capable 
of giving the necessary information to the assertion handler. I sure 
hope it won't be needed for too long.

(Note: this criticism doesn't apply to those assertions dealing with 
exceptions.)

-- 
Michel Fortin
michel.fortin at michelf.com
http://michelf.com/