Bug 44549

After the fix for pr40117 with r160646, the following code (borrowed from somewhere)

MODULE rational_numbers
  IMPLICIT NONE
  PRIVATE
  TYPE,PUBLIC :: rational
    PRIVATE
    INTEGER n,d

    CONTAINS
    ! ordinary type-bound procedure
    PROCEDURE :: real => rat_to_real
    ! specific type-bound procedures for generic support
    PROCEDURE,PRIVATE :: rat_asgn_i, rat_plus_rat, rat_plus_i
    PROCEDURE,PRIVATE,PASS(b) :: i_plus_rat
    ! generic type-bound procedures
    GENERIC :: ASSIGNMENT(=) => rat_asgn_i
    GENERIC :: OPERATOR(+) => rat_plus_rat, rat_plus_i, i_plus_rat
  END TYPE
  CONTAINS
    ELEMENTAL REAL FUNCTION rat_to_real(this) RESULT(r)
      CLASS(rational),INTENT(IN) :: this
      r = REAL(this%n)/this%d
    END FUNCTION
    
    ELEMENTAL SUBROUTINE rat_asgn_i(a,b)
      CLASS(rational),INTENT(OUT) :: a
      INTEGER,INTENT(IN) :: b
      a%n = b
      a%d = 1
    END SUBROUTINE

    ELEMENTAL TYPE(rational) FUNCTION rat_plus_i(a,b) RESULT(r)
      CLASS(rational),INTENT(IN) :: a
      INTEGER,INTENT(IN) :: b
      r%n = a%n + b*a%d
      r%d = a%d
    END FUNCTION
    
    ELEMENTAL TYPE(rational) FUNCTION i_plus_rat(a,b) RESULT(r)
      INTEGER,INTENT(IN) :: a
      CLASS(rational),INTENT(IN) :: b
      r%n = b%n + a*b%d
      r%d = b%d
    END FUNCTION
    
    ELEMENTAL TYPE(rational) FUNCTION rat_plus_rat(a,b) RESULT(r)
      CLASS(rational),INTENT(IN) :: a,b
      r%n = a%n*b%d + b%n*a%d
      r%d = a%d*b%d
    END FUNCTION
END

gives the following bogus error:


class_test.f90:31.48:

    ELEMENTAL TYPE(rational) FUNCTION rat_plus_i(a,b) RESULT(r)
                                                1
Error: Assignment operator interface at (1) must be a SUBROUTINE

and gives an ICE when compiled with -std=f2003


class_test.f90:12.49:

    PROCEDURE,PRIVATE :: rat_asgn_i, rat_plus_rat, rat_plus_i
                                                 1
Error: Fortran 2008: PROCEDURE list at (1)
class_test.f90:16.29:

    GENERIC :: OPERATOR(+) => rat_plus_rat, rat_plus_i, i_plus_rat
                             1
Error: Undefined specific binding 'rat_plus_i' as target of GENERIC '+' at (1)
f951: internal compiler error: Segmentation fault