pub trait LatticeDir<'f, 'tcx>: TypeRelation<'f, 'tcx> {
fn infcx(&self) -> &'f InferCtxt<'f, 'tcx>;
fn relate_bound(&self, v: &'tcx TyS<'tcx>, a: &'tcx TyS<'tcx>, b: &'tcx TyS<'tcx>) -> Result<(), type_err<'tcx>>;
}
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