[Bug fortran/66605] -Wunused-parameter causes internal compiler error with gfortran 5.1.0

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66605

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |6.0

--- Comment #16 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
FIXED in GCC 6.

This is probably a regression, but I'm not sure if a backport would be
accepted. Otherwise, one of the brute-force fixes, like the one in comment #9,
should be enough to fix the ICE.