re PR fortran/89782 (Can do an internal READ of a character array when it is a parameter, but not a scalar character parameter)

2019-06-22  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR fortran/89782
	* io.c (gfc_resolve_dt): Check that internal units are not
	character PARAMETER.

	* gfortran.dg/io_constraints.f90: New test.

From-SVN: r272594