Re-engineer tree_expression postfix handling to make it more flexible. * libinterp/octave-value/ov-fcn.h (octave_function::is_postfix_index_handled): New method. * libinterp/parse-tree/oct-parse.yy (make_index_expression, make_indirect_ref): Set expression postfix index type. * libinterp/parse-tree/pt-exp.h (tree_expression::postfix_index): Remove field. (tree_expression::postfix_index_type): New field. (tree_expression::tree_expression): Initialize it. (tree_expression::copy_base): Copy it. (tree_expression::set_postfix_index, tree_expression::postfix_index): New methods. (tree_expression::mark_postfix_indexed): Remove method. (tree_expression::is_postfix_indexed): Use postfix_index_type field. * libinterp/parse-tree/pt-id.cc (tree_identifier::rvalue): Let the function object determine whether it can handle the first postfix index and call do_multi_index_op if it can't.

--- a/libinterp/parse-tree/oct-parse.yy
+++ b/libinterp/parse-tree/oct-parse.yy
@@ -3169,7 +3169,8 @@
   int l = expr->line ();
   int c = expr->column ();
 
-  expr->mark_postfix_indexed ();
+  if (! expr->is_postfix_indexed ()) 
+    expr->set_postfix_index (type);
 
   if (expr->is_index_expression ())
     {
@@ -3195,6 +3196,9 @@
   int l = expr->line ();
   int c = expr->column ();
 
+  if (! expr->is_postfix_indexed ()) 
+    expr->set_postfix_index ('.');
+
   if (expr->is_index_expression ())
     {
       tree_index_expression *tmp = static_cast<tree_index_expression *> (expr);
@@ -3221,6 +3225,9 @@
   int l = expr->line ();
   int c = expr->column ();
 
+  if (! expr->is_postfix_indexed ()) 
+    expr->set_postfix_index ('.');
+
   if (expr->is_index_expression ())
     {
       tree_index_expression *tmp = static_cast<tree_index_expression *> (expr);