Showing a user specified error message when no overloads match

[Vlad Levenfeld via Digitalmars-d-learn]

opDispatch behaves as though it has SFINAE. When something fails 
in the definition (like I am having now, some of the symbols I 
used in it hadn't been imported) there won't ever be an error 
message, I just get "Error: no property 'bar' for type 'Foo'"

In one case I had to use static ifs and pragmas and static 
assert(0) to get error messages out of opDispatch because static 
assert messages were being suppressed.

Its very frustrating.