erichkeane wrote:

> Indeed, replacing the lambda with a user declared struct with the same 
> `operator()` works: https://godbolt.org/z/8GWv6d88K
> 
> May I try to see if I find a way to delay the instantiations of lambda call 
> operators?

This is unfortunately a sizable amount of work.  We're not supposed to 
instantiate into the body of a lambda call operator until it is called 
(meaning, at all!).  This is a fairly large amount of work that is on my 
'things to do when I have a ton of time' list.  I did the bare basics of it at 
one point to show another patch author how to 'start', and it is similar to the 
'deferred concept instantation' (or delayed?) work that I did about 3 years ago.

You're welcome to try, and that is seemingly the right way forward here, but it 
is not for the feint of heart.

https://github.com/llvm/llvm-project/pull/117167
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