message: Remove dead code from CodeMap
  Summary: Cleaning dead code
diff: @@ -124,17 +124,6 @@ pub struct Spanned<T> {
  pub span: Span,
  }
  -impl<T> Spanned<T> {
  - /// Maps a `Spanned<T>` to `Spanned<U>` by applying the function to the node,
  - /// leaving the span untouched.
  - pub fn map_node<U, F: FnOnce(T) -> U>(self, op: F) -> Spanned<U> {
  - Spanned {
  - node: op(self.node),
  - span: self.span,
  - }
  - }
  -}
  -
  impl<T> Deref for Spanned<T> {
  type Target = T;
  