It doesn't affect optics that happen to include the actual symbol, right?

julia> :&&
:&&

It doesn't affect optics that happen to include the actual symbol, right?

julia> :&&
:&&

You mean like this?

julia> @o (_[:&&])
(@o _[:&&])

Is there anything special with && and ||? @o nautrally doesn't support lots of Julia constructions throwing the same error:

julia> @o x && _
julia> @o x -> _
julia> @o _ ? x : y
julia> @o _, x
julia> @o (_, x)
# all of these throw the same:
ERROR: LoadError: ArgumentError: Cannot parse optic <...>. Lens expressions must start with _, got <...> instead.

Of course the reason is in all of these cases it makes little sense to call set() on such a structure – that's why Accessors refuses to even parse it.
I also like better error messages, but listing specific things we do not support seems unrealistic.

Maybe, phrasing of the error message can be improved instead? What do you think?