{"ast_node_type":"variable","tokens":[{"end":63,"kind":"keyword","start":0,"text":"if"}]}
        if let ty::BoundVariableKind::Region(impl_bv) = impl_bv
    .filter_map(|(idx, (impl_bv, trait_bv))| {
            && let ty::BoundVariableKind::Region(trait_bv) = trait_bv