[Bug c++/93050] throw within constructor initialisation list causes invalid free in destructor

[db0451 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93050

--- Comment #1 from DB <db0451 at gmail dot com> ---
This bug does not seem to occur with

g++ (Debian 9.2.1-21) 9.2.1 20191130

so either it was fixed between 9.2.0 and 9.2.1, or something peculiar to
MSYS2/MinGW64/Windows is causing it.