[Bug c++/66617] C++11 {brace} initialisation of virtually inherited derived class = failure to override base virtual function, unless all base ctors have same signature

[db0451 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66617

--- Comment #3 from Daniel Boles <db0451 at gmail dot com> ---
Created attachment 35824
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35824&action=edit
3 cpp files showing various permutations from totally broken braces, to fully
working parentheses

Revised version as I had saved a wrong file version in the last upload.