[Bug c++/70832] move-assignment of lambdas calls copy-assignment for captures

[blaffablaffa at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70832

--- Comment #2 from Lorenzo Pistone <blaffablaffa at gmail dot com> ---
I should add also that this makes impossible to assign lambdas with move-only
captures to a std::function.