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From: "drikosev at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/99183] New: Incompatible Runtime types
Date: Sat, 20 Feb 2021 20:06:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99183

            Bug ID: 99183
           Summary: Incompatible Runtime types
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: drikosev at gmail dot com
  Target Milestone: ---

Having post a question in c.l.f I was informed that the program below is
invalid but gfortran accepts it (several versions). This is the question:
https://groups.google.com/g/comp.lang.fortran/c/jWHX3kJMeYY/m/4IMgy19hDgAJ

Hope it isn't a duplicate!

$ gfortran8 dream-casting.f90 && ./a.out
 allocated    x =3D d1(ind=3D1,i=3D1)
 allocated    v =3D d2(ind=3D2,j=3D2)
 assigned v =3D x,  now v%ind=3D           1 j=3D           1
$ cat dream-casting.f90
program test
    implicit none

  type :: d0
    integer :: ind
  end type d0

  type, extends(d0) :: d1
    integer :: i
  end type d1

  type, extends(d0) :: d2
    integer :: j
  end type d2

  class(d1),      allocatable :: x
  class(d2),      allocatable :: v

  allocate ( x ,    source =3D d1(1,1))
  print *, "allocated    x =3D d1(ind=3D1,i=3D1)"

  allocate ( v ,    source =3D d2(2,2))
  print *, "allocated    v =3D d2(ind=3D2,j=3D2)"

  v =3D x
  print *, "assigned v =3D x,  now v%ind=3D", v%ind, "j=3D", v%j

end program test=