smol_str to a crate

crates/libsyntax2/src/yellow/syntax.rs

@@ -1,5 +1,7 @@
 use std::{fmt, sync::Arc};
 
+use smol_str::SmolStr;
+
 use {
     yellow::{RedNode, TreeRoot, SyntaxRoot, RedPtr},
     SyntaxKind::{self, *},
@@ -116,6 +118,10 @@ impl<R: TreeRoot> SyntaxNode<R> {
         self.first_child().is_none()
     }
 
+    pub fn leaf_text(&self) -> Option<SmolStr> {
+        self.red().green().leaf_text()
+    }
+
     fn red(&self) -> &RedNode {
         unsafe { self.red.get(&self.root) }
     }