Why is phobos so wack?

[Dukc via Digitalmars-d]

On Sunday, 9 July 2017 at 13:26:31 UTC, Adam D. Ruppe wrote:
> The error message sucks, but you clearly have a string when you 
> meant string[].

To answer the part "why" about them sucking, is that they are 
generic.

Were join() just a regular function taking two strings, or two 
interfaces which string would implement, the messages would be 
better. I my experience D compiler is excellent at error messages 
when you don't go generic. Of course, that does not help much 
because the standard library is templated, not object-oriented.

Generics, and metaprogramming in general, is extremely hard to 
implement so that the error messages are even close to as good as 
elsewhere. No matter the language. Or rather, it can be made to 
give good messages, C# is a piece of proof for that. But that's 
also a reson why C# templates are so wimpy and ungeneral compared 
to C++ and D.

About C++ from what I've heard, generic error messages there are 
not only much worse than others, they are much worse than even D 
template errors!