[Fortran] ICE in gfc_typenode_for_spec PR93603

Associating a symbol with a BOZ constant caused an ICE.  Output
an error message as an association target cannot be a BOZ
constant.

Original patch provided by Steven G. Kargl  <kargl@gcc.gnu.org>.

gcc/fortran/ChangeLog

	PR fortran/93603
	* match.c (gfc_match_associate) : If target expression
	has the type BT_BOZ output an error and goto
	assocListError.

gcc/testsuite/ChangeLog

	PR fortran/93603
	* gfortran.dg/pr93603.f90 : New test.

gcc/fortran/ChangeLog

 2020-02-18  Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/93603
+	* match.c (gfc_match_associate) : If target expression
+	has the type BT_BOZ output an error and goto
+	assocListError.
+
+2020-02-18  Steven G. Kargl  <kargl@gcc.gnu.org>
 	    Mark Eggleston  <markeggleston@gcc.gnu.org>
 
 	PR fortran/93580

gcc/fortran/match.c

@@ -1957,6 +1957,14 @@ gfc_match_associate (void)
 	  goto assocListError;
 	}
 
+      /* The target expression cannot be a BOZ literal constant.  */
+      if (newAssoc->target->ts.type == BT_BOZ)
+	{
+	  gfc_error ("Association target at %L cannot be a BOZ literal "
+		     "constant", &newAssoc->target->where);
+	  goto assocListError;
+	}
+
       /* The `variable' field is left blank for now; because the target is not
 	 yet resolved, we can't use gfc_has_vector_subscript to determine it
 	 for now.  This is set during resolution.  */

gcc/testsuite/ChangeLog

+2020-02-18  Mark Eggleston  <mark.eggleston@codethink.com>
+
+	PR fortran/93603
+	* gfortran.dg/pr93603.f90 : New test.
+
 2020-02-20  Mark Eggleston <markeggleston@gcc.gnu.org>
 
 	PR fortran/93580

gcc/testsuite/gfortran.dg/pr93603.f90

+! { dg-do compile }
+
+program p
+  associate (y => z'1') ! { dg-error "cannot be a BOZ literal constant" }
+  end associate         ! { dg-error "Expecting END PROGRAM" }
+end
+