[Bug c++/67910] Two autos in a single function confuses the type system

[guille at cal dot berkeley.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67910

--- Comment #3 from Guille <guille at cal dot berkeley.edu> ---
gcc 5.2.0: -Wall -Wextra -std=c++1y