infcx: &'a InferCtxt<'a, 'tcx>,
param_env: ty::ParamEnv<'tcx>,
body_owner: LocalDefId,
upvars: Option<&'tcx FxIndexMap<hir::HirId, hir::Upvar>>,
}
infcx: &'a InferCtxt<'a, 'tcx>,
param_env: ty::ParamEnv<'tcx>,
body_owner: LocalDefId,
upvars: Option<&'tcx FxIndexMap<hir::HirId, hir::Upvar>>,
}