[Bug c++/87531] [8/9 Regression] assignment operator does nothing if performed as a call via operator=

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87531

--- Comment #9 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Created attachment 45169
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45169&action=edit
non operator= version

This turns out to be an orthogonal regression as shown by the new testcase.  We
fail to notice there are template definitions in the current class.

works in 7.x fails in 8.x & trunk