[Bug c++/43064] improve location and text of diagnostics in constructor initializer lists

[jg at jguk dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43064

--- Comment #12 from Jonny Grant <jg at jguk dot org> ---
(In reply to David Malcolm from comment #11)
> Should be fixed (for gcc 9) by r267272.

Fantastic David!