https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79426
--- Comment #8 from G. Steinmetz <gs...@t-online.de> ---
And to make the picture complete, if you _add_ another integer
(regarding comment 5), it compiles silently (but breaks at run time).
$ cat z2.f90
program p
type t
integer :: a
integer :: b
integer :: c
class(*), pointer :: u(:)
end type
type(t) :: z
select type (y => z%u(1))
end select
end
$ gfortran-9-20181111 z2.f90
$
$ a.out
Program received signal SIGSEGV: Segmentation fault - invalid memory reference.
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