[Bug c++/116095] satisfaction of atomic constraint depends on itself, when piping boost range into range-v3

[enricomaria.dean6elis at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116095

--- Comment #1 from Enrico Maria De Angelis <enricomaria.dean6elis at gmail dot com> ---
Forgot to say that at the question on stackoverflow I've listed other ways that
make the code compile:

  - change list to vector
  - make r const