message: Avoid uri.to_string
  Summary: Slightly more efficient.
diff: @@ -130,9 +130,7 @@ impl<T: LspContext> Backend<T> {
  }
  fn validate(&self, uri: Url, version: Option<i64>, text: String) {
  - let eval_result = self
  - .context
  - .parse_file_with_contents(&uri.to_string(), text);
  + let eval_result = self.context.parse_file_with_contents(uri.as_ref(), text);
  if let Some(ast) = eval_result.ast {
  let ast = Arc::new(ast);
  let mut last_valid_parse = self.last_valid_parse.write().unwrap();
  