Exclude faster string push from normal compile
@@ -689,6 +689,7 @@ impl TreeBuilder<RopeInfo> {
///
/// Splits the string into leaves first and
/// then pushes all the leaves onto the accumulating tree in one go.
+ #[cfg(test)]
pub fn push_str_stacked(&mut self, s: &str) {
let leaves = split_as_leaves(s);
self.push_leaves(leaves);
