re PR fortran/77657 (link error with implementation of user-defined derived type input/output (UD-DTIO) in child extending abstract parent)

2016-09-21  Paul Thomas  <pault@gcc.gnu.org>

	PR fortran/77657

	* interface.c (gfc_find_specific_dtio_proc): Borrow trick from
	resolve_typebound_generic_call to find dtio procedures that
	over-ride those in the declared type.

2016-09-21  Paul Thomas  <pault@gcc.gnu.org>

	PR fortran/77657
	* gfortran.dg/dtio_12.f90: New test.

From-SVN: r240301