[Bug c++/83796] Abstract classes allowed to be instantiated when initialised as default parameter to function or constructor

[johnsonmichaelgraham at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83796

Michael Johnson <johnsonmichaelgraham at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|5.4.0                       |7.2.0

--- Comment #1 from Michael Johnson <johnsonmichaelgraham at gmail dot com> ---
Correctly won't compile on MSVC and Clang, erroneously compiles from gcc 4.7.3
onwards

Godbolt: https://godbolt.org/g/EuR2cy

I think may be caused by change:
https://gcc.gnu.org/viewcvs/gcc/trunk/gcc/cp/call.c?r1=194820&r2=194819&pathrev=194820&diff_format=f

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54325