{"ast_node_type":"variable","tokens":[{"end":89,"kind":"keyword","start":0,"text":"let"}]}
        let (_, proven_via) = self.probe(|_| ProbeKind::ShadowedEnvProbing).enter(|ecx| {
    ) -> QueryResult<I> {
            let trait_goal: Goal<I, ty::TraitPredicate<I>> =