2018-01-15  Louis Krupp  <louis.krupp@zoho.com>

	PR fortran/82257
	* interface.c (compare_rank): Don't try to retrieve CLASS_DATA
	from symbol marked unlimited polymorphic.
	* resolve.c (resolve_structure_cons): Likewise.
	* misc.c (gfc_typename): Don't dereference derived->components
	if it's NULL.

2018-01-15  Louis Krupp  <louis.krupp@zoho.com>

	PR fortran/82257
	* gfortran.dg/unlimited_polymorphic_28.f90: New test.

From-SVN: r256720