Function rustc_typeck::check::wfcheck::check_impl

pub(in check::wfcheck) fn check_impl<'tcx>(
    tcx: TyCtxt<'tcx>, 
    item: &'tcx Item<'tcx>, 
    ast_self_ty: &Ty<'_>, 
    ast_trait_ref: &Option<TraitRef<'_>>
)