new startHEADmaster

Now I tested and discussed with claude, and had a working version of
this project.  The rest is to port the claude version to my own
writings.  So this serves as the starting point before that attempt.

In the new attempt the design is better, and a number of bugs were
found and supposedly fixed, so let us see how this goes at the end.

1 files changed, 7 insertions, 5 deletions

diff --git a/chain/src/item/genins.rs b/chain/src/item/genins.rs
index e3e79b6..7ac771c 100644
--- a/chain/src/item/genins.rs
+++ b/chain/src/item/genins.rs
@@ -180,7 +180,7 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
         label: Edge,
         ter: usize,
         fragment: impl Borrow<DefaultForest<ForestLabel<GrammarLabel>>>,
-        atom_child_iter: impl Iterator<Item = usize> + ExactSizeIterator + Clone,
+        atom_child_iter: impl ExactSizeIterator<Item = usize> + Clone,
         atom: &DefaultAtom,
     ) -> Result<PaVi, Error> {
         let root = if let Some(root) = self.root() {
@@ -304,7 +304,7 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
         let is_empty_segment = pavi.is_empty();
 
         if true_source.is_virtual() {
-            self.close_pavi(atom.borrow(), true_source, pos)?;
+            self.close_pavi(atom, true_source, pos)?;
 
             if to_print {
                 self.print_viz(&format!(
@@ -330,7 +330,7 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
                             let virtual_frag = atom.generate_virtual_frags(nt, t, Some(rule));
 
                             if let Some(frag) = virtual_frag {
-                                let mut frag = (*frag.get(0).unwrap()).clone();
+                                let mut frag = (*frag.first().unwrap()).clone();
 
                                 frag.set_pos(atom, node_label.label().start(), true)?;
 
@@ -377,7 +377,7 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
         if let PaVi::Parent(node, edge, _) = pavi {
             let nth_child = self.nth_child(node, edge)?;
 
-            let reduced = self.reduction(nth_child, pos, ter, atom.borrow(), false)?;
+            let reduced = self.reduction(nth_child, pos, ter, atom, false)?;
 
             // dbg!(reduced, nth_child, self.is_empty_node(reduced)?);
 
@@ -543,7 +543,9 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
 
                 self.print_viz("dbg forest.gv").unwrap();
 
-                #[cfg(test)]
+                // atom.print_nfa("nfa.gv").unwrap();
+
+                // #[cfg(test)]
                 crate::item::default::print_labels(atom, self.borrow()).unwrap();
 
                 return Err(Error::CannotPlant);