Help improve error message

[Petar]

On Sunday, 7 May 2023 at 14:19:49 UTC, Steven Schveighoffer wrote:
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> [..]

I completely agree about you in the general case. However, just 
like you highlighted the interaction between `std.conv.to` and 
`core.time.to`, I believe we do have something we can do to 
improve the status quo in this specific case, although not easily 
feasible in the current language - if the compiler lowered `V[K]` 
types to a fully library defined type (say 
`core.associative_array.Hash(Key, Value)`), then all the 
AA-related free functions we currently have in `object.d` would 
become member functions and then the compiler wouldn't consider 
them as overload candidates.

Speaking of this, I now remembered that you created this project: 
https://github.com/schveiguy/newaa

What language changes are necessary before we can replace the 
built-in AAs with a completely library-based solution?