https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98824
--- Comment #1 from Dimitri Gorokhovik <dimitri.gorokhovik at free dot fr> ---
It doesn't seem to contradict N4868 :-(
Modifying the code slightly (adding refs, splitting deduction across two fn
templates) didn't show any other differences from clang: all other modification
either both pass or both fail with the equivalent messages ("'i' cannot be
deduced"). This is the only one.
clang version:
Ubuntu clang version
12.0.0-++20201102052620+327bf5c2d91-1~exp1~20201102163303.210
Target: x86_64-pc-linux-gnu
