PR fortran/95709 - ICE in gfc_resolve_code, at fortran/resolve.c:11807

The legacy "assigned GOTO" accepts only scalar integer variables.
Check for proper arguments.

gcc/fortran/
	PR fortran/95709
	* resolve.c (gfc_resolve_code): Check for valid arguments to
	assigned GOTO.

(cherry picked from commit 824084e72e388f81015e7f67922c75f50741355a)

gcc/fortran/resolve.c

@@ -11801,10 +11801,18 @@ start:
 	case EXEC_GOTO:
 	  if (code->expr1 != NULL)
 	    {
-	      if (code->expr1->ts.type != BT_INTEGER)
-		gfc_error ("ASSIGNED GOTO statement at %L requires an "
-			   "INTEGER variable", &code->expr1->where);
-	      else if (code->expr1->symtree->n.sym->attr.assign != 1)
+	      if (code->expr1->expr_type != EXPR_VARIABLE
+		  || code->expr1->ts.type != BT_INTEGER
+		  || (code->expr1->ref
+		      && code->expr1->ref->type == REF_ARRAY)
+		  || code->expr1->symtree == NULL
+		  || (code->expr1->symtree->n.sym
+		      && (code->expr1->symtree->n.sym->attr.flavor
+			  == FL_PARAMETER)))
+		gfc_error ("ASSIGNED GOTO statement at %L requires a "
+			   "scalar INTEGER variable", &code->expr1->where);
+	      else if (code->expr1->symtree->n.sym
+		       && code->expr1->symtree->n.sym->attr.assign != 1)
 		gfc_error ("Variable %qs has not been assigned a target "
 			   "label at %L", code->expr1->symtree->n.sym->name,
 			   &code->expr1->where);

gcc/testsuite/gfortran.dg/pr95709.f90

+! { dg-do compile }
+! { dg-options "-std=legacy" }
+! PR fortran/95709 - ICE in gfc_resolve_code, at fortran/resolve.c:11807
+
+program p
+  integer, parameter :: i(1) = 1
+  integer, parameter :: j    = 1
+  integer            :: k(1) = 1
+  goto i(1)        ! { dg-error "requires a scalar INTEGER variable" }
+  goto j           ! { dg-error "requires a scalar INTEGER variable" }
+  goto k(1)        ! { dg-error "requires a scalar INTEGER variable" }
+  goto i%kind, (1) ! { dg-error "requires a scalar INTEGER variable" }
+1 continue
+end