[Bug fortran/68318] ICE on duplicate entry declarations

["gerhard dot steinmetz dot fortran at t-online dot de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68318

--- Comment #1 from Gerhard Steinmetz <gerhard.steinmetz.fortran@t-online.de> ---
Somehow similar for functions :

$ cat z3.f90
module m
contains
   real function f1()
   entry e()
   end
   real function f2()
   entry e()
   end
end module


$ gfortran -g -O0 -Wall -fcheck=all -c z3.f90
z3.f90:7.10:

   entry e()
          1
z3.f90:4.10:

   entry e()
          2
Error: Procedure 'e' at (1) is already defined at (2)
f951: internal compiler error: in gfc_release_symbol, at fortran/symbol.c:2591

---

And interestingly, detected with explicit declaration of e :

$ cat z4.f90
module m
   implicit none
contains
   real function f1()
      real :: e
   entry e()
   end
   real function f2()
      real :: e
   entry e()
   end
end module


$ gfortran -g -O0 -Wall -fcheck=all -c z4.f90
z4.f90:10.10:

   entry e()
          1
z4.f90:5.15:

      real :: e
               2
Error: Procedure 'e' at (1) is already defined at (2)