diff options
Diffstat (limited to 'plugins/setoid_ring/ArithRing.v')
| -rw-r--r-- | plugins/setoid_ring/ArithRing.v | 29 |
1 files changed, 22 insertions, 7 deletions
diff --git a/plugins/setoid_ring/ArithRing.v b/plugins/setoid_ring/ArithRing.v index 5f5b9792..bb1eca49 100644 --- a/plugins/setoid_ring/ArithRing.v +++ b/plugins/setoid_ring/ArithRing.v @@ -1,9 +1,11 @@ (************************************************************************) -(* v * The Coq Proof Assistant / The Coq Development Team *) -(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2016 *) +(* * The Coq Proof Assistant / The Coq Development Team *) +(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *) +(* <O___,, * (see CREDITS file for the list of authors) *) (* \VV/ **************************************************************) -(* // * This file is distributed under the terms of the *) -(* * GNU Lesser General Public License Version 2.1 *) +(* // * This file is distributed under the terms of the *) +(* * GNU Lesser General Public License Version 2.1 *) +(* * (see LICENSE file for the text of the license) *) (************************************************************************) Require Import Mult. @@ -41,9 +43,12 @@ Ltac Ss_to_add f acc := | _ => constr:((acc + f)%nat) end. +(* For internal use only *) +Local Definition protected_to_nat := N.to_nat. + Ltac natprering := match goal with - |- context C [S ?p] => + |- context C [S ?p] => match p with O => fail 1 (* avoid replacing 1 with 1+0 ! *) | p => match isnatcst p with @@ -52,9 +57,19 @@ Ltac natprering := fold v; natprering end end - | _ => idtac + | _ => change N.to_nat with protected_to_nat + end. + +Ltac natpostring := + match goal with + | |- context [N.to_nat ?x] => + let v := eval cbv in (N.to_nat x) in + change (N.to_nat x) with v; + natpostring + | _ => change protected_to_nat with N.to_nat end. Add Ring natr : natSRth - (morphism nat_morph_N, constants [natcst], preprocess [natprering]). + (morphism nat_morph_N, constants [natcst], + preprocess [natprering], postprocess [natpostring]). |