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error[E0621]: explicit lifetime required in the type of `s`
 --> src/lib.rs:5:9
  |
5 |         Self(s)
  |         ^^^^^^^ lifetime `'a` required
  |
help: add explicit lifetime `'a` to the type of `s`
  |
4 |     fn new(s: &'a str) -> Node<'_> {
  |                ++

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-        Self(s)
+        Node(s)