[Bug c++/70827] [6/7 regression] dubious use of deleted function in inherited constructor

[jens.maurer at gmx dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70827

--- Comment #2 from Jens Maurer <jens.maurer at gmx dot net> ---
A prominent use case is that std::unique_ptr in the parameter list of an
inherited constructor stops working.