Switch to intra rustdoc links
diff --git a/src/expr.rs b/src/expr.rs
index 1caa049..4af7175 100644
--- a/src/expr.rs
+++ b/src/expr.rs
@@ -748,6 +748,9 @@
     /// This type is a [syntax tree enum].
     ///
     /// [syntax tree enum]: enum.Expr.html#syntax-tree-enums
+    //
+    // TODO: change syntax-tree-enum link to an intra rustdoc link, currently
+    // blocked on https://github.com/rust-lang/rust/issues/62833
     pub enum Pat {
         /// A pattern that matches any value: `_`.
         ///