Function rustc::ty::relate::relate_substs

pub fn relate_substs<'a, 'gcx, 'tcx, R>(relation: &mut R, variances: Option<&ItemVariances>, a_subst: &'tcx Substs<'tcx>, b_subst: &'tcx Substs<'tcx>) -> RelateResult<'tcx, &'tcx Substs<'tcx>> where R: TypeRelation<'a, 'gcx, 'tcx>, 'gcx: 'a + 'tcx, 'tcx: 'a

Unstable (rustc_private)