make marker into an iterators, recover post_order_iterator

2022-04-02 22:45:10 -06:00
parent c9a34bde3f
commit 0ab928063e
4 changed files with 133 additions and 304 deletions
--- a/src/machine/arithmetic_ops.rs
+++ b/src/machine/arithmetic_ops.rs
@@ -1098,7 +1098,7 @@ impl MachineState {

    pub(crate) fn arith_eval_by_metacall(&mut self, value: HeapCellValue) -> Result<Number, MachineStub> {
        let stub_gen = || functor_stub(atom!("is"), 2);
-        let mut iter = stackful_post_order_iter(&mut self.heap, value); // was stackless!
+        let mut iter = stackful_post_order_iter(&mut self.heap, value);

        while let Some(value) = iter.next() {
            if value.is_forwarded() {