You know how I was saying in my DConf talk...

[JN]

On Tuesday, 23 July 2019 at 18:36:19 UTC, Ethan wrote:
> This highlights one of the other things I don't like when 
> errors like this happens: D's quality of error messages is 
> still not great. They've most definitely improved since DDMD 
> happened, but they still seem predicated on the idea that 
> people aren't going to be doing a lot of metaprogramming and 
> provide almost no context when you're deep down the meta hole.

That's how metaprogramming oriented languages are. Every language 
that has advanced metaprogramming like C++ or D sooner or later 
ends up in template spaghetti. Sure, the error messages are nice 
for simple templates, and performance is nice too, but once you 
have several generic types and then use them together, good luck, 
both on errors and compilation speed time. Oh and autocomplete 
breaks too because most of the code doesn't exist until build 
time.