[Bug c++/68138] "operator== is ambiguous" when comparing a tuple containing values with one containing refs

[ville.voutilainen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68138

--- Comment #1 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
The test works if operator== is not a member. There's something fairly fishy
going on here.