Replace old iteration with new iteration.

src/iter/ast_node_iter.rs

@@ -69,7 +69,7 @@ use crate::types::VerseBlock;
 /// This only iterates over the children, not the starting node itself. So an AstNodeIter::PlainList would only return PlainListItems, not the PlainList.
 ///
 /// This only iterates over AST nodes, so an AstNodeIter::Heading would iterate over both the title and section contents, but it would not iterate over simple strings like the TODO keyword or priority.
-pub enum AstNodeIter<'r, 's> {
+pub(crate) enum AstNodeIter<'r, 's> {
     // Document Nodes
     Document(DocumentIter<'r, 's>),
     Heading(HeadingIter<'r, 's>),
@@ -132,7 +132,7 @@ pub enum AstNodeIter<'r, 's> {
 }
 
 impl<'r, 's> AstNodeIter<'r, 's> {
-    pub fn from_ast_node(node: &AstNode<'r, 's>) -> AstNodeIter<'r, 's> {
+    pub(crate) fn from_ast_node(node: &AstNode<'r, 's>) -> AstNodeIter<'r, 's> {
         match node {
             AstNode::Document(inner) => AstNodeIter::Document(inner.into_iter()),
             AstNode::Heading(inner) => AstNodeIter::Heading(inner.into_iter()),

src/iter/mod.rs

@@ -2,3 +2,4 @@ mod all_ast_node_iter;
 mod ast_node;
 mod ast_node_iter;
 mod macros;
+pub(crate) use ast_node::AstNode;