{"ast_node_type":"variable","tokens":[{"end":79,"kind":"keyword","start":0,"text":"if"}]}
        if let ty::ClauseKind::Projection(proj) = clause.kind().skip_binder() {
    for (clause, _) in impl_generic_predicates.predicates.iter() {
            let unbound_trait_ref = proj.projection_term.trait_ref(tcx);