I have a template function with a particular constraint (in this
case [1]). When this constraint doesn't match, I want to give the
user a suggestion what to do instead.
The only way I know of to do this currently is to relax the
template constraints, and adding a `static assert`. However, if
there is another function that would match, this would lead to an
ambiguity.
Is there a way to trigger the static assert only if there are no
other overloads (including members and UFCS functions) that
match? Or maybe a solution that only works for this particular
case?
[1] https://github.com/D-Programming-Language/phobos/pull/2350
