diff options
Diffstat (limited to 'kernel/indtypes.ml')
| -rw-r--r-- | kernel/indtypes.ml | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/kernel/indtypes.ml b/kernel/indtypes.ml index 91aec40c..9b1ddc31 100644 --- a/kernel/indtypes.ml +++ b/kernel/indtypes.ml @@ -1,12 +1,12 @@ (************************************************************************) (* v * The Coq Proof Assistant / The Coq Development Team *) -(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2010 *) +(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2011 *) (* \VV/ **************************************************************) (* // * This file is distributed under the terms of the *) (* * GNU Lesser General Public License Version 2.1 *) (************************************************************************) -(* $Id: indtypes.ml 13323 2010-07-24 15:57:30Z herbelin $ *) +(* $Id: indtypes.ml 14641 2011-11-06 11:59:10Z herbelin $ *) open Util open Names @@ -247,8 +247,16 @@ let typecheck_inductive env mie = let param_ccls = List.fold_left (fun l (_,b,p) -> if b = None then let _,c = dest_prod_assum env p in - let u = match kind_of_term c with Sort (Type u) -> Some u | _ -> None in - u::l + (* Add Type levels to the ordered list of parameters contributing to *) + (* polymorphism unless there is aliasing (i.e. non distinct levels) *) + match kind_of_term c with + | Sort (Type u) -> + if List.mem (Some u) l then + None :: List.map (function Some v when u = v -> None | x -> x) l + else + Some u :: l + | _ -> + None :: l else l) [] params in |