fix PR 86935

2018-08-22  Janus Weil  <janus@gcc.gnu.org>

	PR fortran/86935
	* match.c (gfc_match_associate): Improve diagnostics for the ASSOCIATE
	statement.

2018-08-22  Janus Weil  <janus@gcc.gnu.org>

	PR fortran/86935
	* gfortran.dg/associate_3.f90: Update error message.
	* gfortran.dg/associate_39.f90: New test case.

From-SVN: r263787