[Bug fortran/66106] New: ICE on incomplete interface operator block (gfc_op2string)

[gerhard.steinmetz.fort...@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66106

            Bug ID: 66106
           Summary: ICE on incomplete interface operator block
                    (gfc_op2string)
           Product: gcc
           Version: 5.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gerhard.steinmetz.fort...@t-online.de
  Target Milestone: ---

This code snippet with an incomplete interface operator block ...
   program p
      interface operator ( .gt. )
      end interface operator
   end

or this variation (wrong) ...
   program p
      interface operator ( .gt. )
      end interface gt
   end

or this variation (wrong) ...
   program p
      interface operator ( > )
      end interface gt
   end

prints (with gfortran 5.1.1 on SUSE Linux 13.2, 64 bit)
f951: internal compiler error: gfc_op2string(): Bad code

---

Whereas for example ...
   subroutine p
      interface assignment ( = )
      end interface assignment
   end

$ gfortran -c snippet.f90
Error: Expected 'END INTERFACE ASSIGNMENT (=)' at (1)

Kind regards.