What are the prominent downsides of the D programming language?

[mw]

On Tuesday, 29 September 2020 at 18:26:42 UTC, Jean-Louis Leroy 
wrote:
>> This is an interesting idea, basically implement the Eiffel 
>> compiler (the OO part) as a D library, and perhaps also use 
>> openmethods, then we will have a Lisp's multi-methods + Eiffel 
>> OO inheritance.
>>
>> I'm not sure how complex this implementation is going to look 
>> like.
...
> Anyway, back to mw's post, I am pretty sure that it is possible 
> to write a fairly good CLOS in D.

Good to hear, I opened an discussion issue here:

https://github.com/jll63/openmethods.d/issues/19

Anyone who's interested in the implementation, let's continue the 
brain storming there.