{"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"#[instrument(skip(self),"}]}
    #[instrument(skip(self), level = "trace")]
    /// - `Pin<Box<T>>` as `Pin<&mut T>`
    fn coerce_pin_ref(&self, a: Ty<'tcx>, b: Ty<'tcx>) -> CoerceResult<'tcx> {