I stumbled upon that myself recently, but in that case, it was sufficient to treat the postfix operators as "modifiers" -- just let the operator's "led" method modify the left node, and then return that node instead of itself. More extensive tree modifications are also possible, but is more work.
Excellent suggestion, thanks. In my case the solution was to have the postfix "led" make a copy of its "left" argument, then modify the original to have a new "id", signifying the postfix operation, with the copy as its "first" argument. Works beautifully.
I stumbled upon that myself recently, but in that case, it was sufficient to treat the postfix operators as "modifiers" -- just let the operator's "led" method modify the left node, and then return that node instead of itself. More extensive tree modifications are also possible, but is more work.
Excellent suggestion, thanks. In my case the solution was to have the postfix "led" make a copy of its "left" argument, then modify the original to have a new "id", signifying the postfix operation, with the copy as its "first" argument. Works beautifully.