{"ast_node_type":"variable","tokens":[{"end":86,"kind":"keyword","start":0,"text":"let"}]}
    let normalize_param_env = param_env_with_gat_bounds(tcx, impl_ty, impl_trait_ref);
    // See <https://github.com/rust-lang/rust/pull/117542#issue-1976337685>.
    for obligation in &mut obligations {