-> Option<ty::Binder<Ty<'tcx>>>
{
let closure_ty = self.mk_closure(closure_def_id, closure_substs);
- let env_region = ty::ReLateBound(ty::DebruijnIndex::INNERMOST, ty::BrEnv);
+ let env_region = ty::ReLateBound(ty::INNERMOST, ty::BrEnv);
let closure_kind_ty = closure_substs.closure_kind_ty(closure_def_id, self);
let closure_kind = closure_kind_ty.to_opt_closure_kind()?;
let env_ty = match closure_kind {