{"ast_node_type":"struct","tokens":[{"end":28,"kind":"keyword","start":0,"text":"//"}]}
        // that struct type.
        // For the purposes of this function, we hope that it is a `struct` type, and that our current `expr` is a literal of
        let impl_trait_self_ref = if self.tcx.is_trait_alias(obligation.impl_or_alias_def_id) {