Why are some types from std not in the core of the language?

[Paul Backus]

On Friday, 10 June 2022 at 14:00:13 UTC, zjh wrote:
> On Friday, 10 June 2022 at 13:21:09 UTC, Paul Backus wrote:
>> the code quality of the DMD
>>> fronted has deteriorated to the point where it is basically 
>>> impossible to do a correct, complete implementation of any 
>>> non-trivial language feature.
>
> Is it because there is no `class encapsulation`?

No, it's because there's too much shared mutable state, and not 
enough immutable objects and pure functions.