[Bug c++/79172] -Wunused-but-set-parameter gone nuts

[petschy at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79172

--- Comment #2 from petschy at gmail dot com ---
Created attachment 40563
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40563&action=edit
preprocessed source of the reduced test case