{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"#[instrument(level"}]}
    #[instrument(level = "debug", skip(self, sp), ret)]
    /// in this case.
    pub(crate) fn try_structurally_resolve_type(&self, sp: Span, ty: Ty<'tcx>) -> Ty<'tcx> {