fix PR 89601

2019-03-13  Janus Weil  <janus@gcc.gnu.org>

	PR fortran/89601
	* decl.c (gfc_match_formal_arglist): Reject empty type parameter lists.
	(gfc_match_derived_decl): Mark as PDT only if type parameter list was
	matched successfully.

2019-03-13  Janus Weil  <janus@gcc.gnu.org>

	PR fortran/89601
	* gfortran.dg/pdt_16.f03: Modified to avoid follow-up errors.
	* gfortran.dg/pdt_30.f90: New test case.

From-SVN: r269658