Function synthesize_auto_trait_impl

fn synthesize_auto_trait_impl<'tcx>(
    cx: &mut DocContext<'tcx>,
    ty: Ty<'tcx>,
    trait_def_id: DefId,
    param_env: ParamEnv<'tcx>,
    item_def_id: DefId,
    finder: &AutoTraitFinder<'tcx>,
    discard_positive_impls: DiscardPositiveImpls,
) -> Option<Item>