https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88047
--- Comment #5 from G. Steinmetz <gs...@t-online.de> ---
A related test case, also changed between 20180909 and 20180916 :
$ cat z2.f90
program p
type t
integer :: n
end type
class(t) :: a, x
x = a
end
$ gfortran-9-20180909 -c z2.f90
z2.f90:5:16:
5 | class(t) :: a, x
| 1
Error: CLASS variable 'a' at (1) must be dummy, allocatable or pointer
z2.f90:5:19:
5 | class(t) :: a, x
| 1
Error: CLASS variable 'x' at (1) must be dummy, allocatable or pointer
z2.f90:6:3:
6 | x = a
| 1
Error: Nonallocatable variable must not be polymorphic in intrinsic assignment
at (1) - check that there is a matching specific subroutine for '=' operator
$ gfortran-9-20181209 -c z2.f90
f951: internal compiler error: Segmentation fault
0xb2f31f crash_signal
../../gcc/toplev.c:326
0x5fb831 gfc_find_derived_vtab(gfc_symbol*)
../../gcc/fortran/class.c:2220
0x5ff91b gfc_find_vtab(gfc_typespec*)
../../gcc/fortran/class.c:2847
0x64d572 gfc_match_assignment()
../../gcc/fortran/match.c:1378
0x66f120 match_word
../../gcc/fortran/parse.c:65
0x66f120 decode_statement
../../gcc/fortran/parse.c:361
0x670c7a next_free
../../gcc/fortran/parse.c:1235
0x670c7a next_statement
../../gcc/fortran/parse.c:1467
0x67228b parse_spec
../../gcc/fortran/parse.c:3859
0x674d2c parse_progunit
../../gcc/fortran/parse.c:5674
0x6763a9 gfc_parse_file()
../../gcc/fortran/parse.c:6214
0x6bf27f gfc_be_parse_file
../../gcc/fortran/f95-lang.c:204
