{"ast_node_type":"variable","tokens":[{"end":40,"kind":"keyword","start":0,"text":"let"}]}
                let alias_bound_result =
                // exist. Instead, `Pointee<Metadata = ()>` should be a supertrait of `Sized`.
                    ecx.probe_builtin_trait_candidate(BuiltinImplSource::Misc).enter(|ecx| {