[Bug c++/69730] problem with references and templates when using O2

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69730

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I suspect it's because x() returns an rvalue B (a copy) which you then instruct
to
return a reference to its member which you bind to x.  But that copy of B dies
after

    const double & x = a.x().value();

and thus the content of what x refers to is gone.