[Bug c++/19808] miss a warning about uninitialized member usage in member initializer list in constructor

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19808

--- Comment #33 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Manuel López-Ibáñez from comment #32)
> (In reply to Richard Biener from comment #31)
> > This is really a dup of PR2972.
> > 
> > *** This bug has been marked as a duplicate of bug 2972 ***
> 
> No, it is  not. The difference is explained by Jason in comment #22 and the
> existing bug by me in comment #23.
> 
> There is not only a conceptual difference but a difference in difficulty.
> This bug can be solved entirely by the C++ FE (and this is what the patch in
> comment #29 does) while PR2972 needs middle-end support.

I have a fix for PR2972 and it also correctly handles this case so why is it
"conceptually different"?