Instantiation of nested structs should be allowed outside their parent scope

[Alexandru Ermicioi]

On Tuesday, 9 November 2021 at 22:22:20 UTC, Alexandru Ermicioi 
wrote:
> ...
>
> Best regards,
> Alexandru.

You may also try iterate over all constructor overloads, and 
check for function signature with is expression. This should not 
force the compiler to instantiate the struct (and hence complain 
for missing context pointer), and achieve what you need in case 
for copy constructor.