[Bug c++/106837] False compilation error "inconsistent begin/end types in range-based 'for' statement"

[ofekshilon at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106837

--- Comment #4 from Ofek Shilon <ofekshilon at gmail dot com> ---
This can be tested empirically. Remove the entire build_x_binary_op check,
build gcc and run on this snippet. If it builds correctly than the begin/end
types are indeed comparable and the emitted error is false.