Hello, again I want to point to pattern matching. 

I mean, we are 2/3 there. 
1) we have the desire to have PM as expression, so that we can use it on the RHS of assignment
2) we have Concepts, so that we can select the alternative, based on its structure

Last point is to have an attractive syntax, so that people will not require another language feature.

On Wed, Sep 21, 2022 at 12:59 PM Frederick Virchanza Gotham via Std-Proposals <std-proposals@lists.isocpp.org> wrote:
My draft paper can be downloaded from here:


Of course it needs loads more work.
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