# HG changeset patch
# User smolkas
# Date 1369219149 -7200
# Node ID 411db77f96f2886053bfd628a5c8f2cdea019c4c
# Parent  39ac12f31f5cdb9cdb2582680b146611991a3be1
prevent pretty printer from automatically annotating numerals

diff -r 39ac12f31f5c -r 411db77f96f2 src/HOL/Tools/Sledgehammer/sledgehammer_annotate.ML
--- a/src/HOL/Tools/Sledgehammer/sledgehammer_annotate.ML	Wed May 22 12:39:07 2013 +0200
+++ b/src/HOL/Tools/Sledgehammer/sledgehammer_annotate.ML	Wed May 22 12:39:09 2013 +0200
@@ -34,6 +34,19 @@
 fun post_fold_term_type f s t =
   post_traverse_term_type (fn t => fn T => fn s => (t, f t T s)) s t |> snd
 
+local
+fun natify_numeral' (t as Const (s, T)) =
+    (case s of
+      "Groups.zero_class.zero" => Const (s, @{typ "nat"})
+    | "Groups.one_class.one" => Const (s, @{typ "nat"})
+    | "Num.numeral_class.numeral" => Const(s, @{typ "num"} --> @{typ "nat"})
+    | "Num.numeral_class.neg_numeral" => Const(s, @{typ "num"} --> @{typ "nat"})
+    | _ => t)
+  | natify_numeral' t = t
+in
+val natify_numerals = Term.map_aterms natify_numeral'
+end
+
 (* Data structures, orders *)
 val cost_ord = prod_ord int_ord (prod_ord int_ord int_ord)
 structure Var_Set_Tab = Table(
@@ -143,7 +156,12 @@
         if p <> cp then (t, (cp + 1, annots))
         else (Type.constraint T t, (cp + 1, annots'))
       | post2 t _ x = (t, x)
-  in post_traverse_term_type post2 (0, rev annots) t |> fst end
+  in
+    t |> natify_numerals (* typing all numerals as "nat"s prevents the pretty
+         printer from inserting additional, unwanted type annotations *)
+      |> post_traverse_term_type post2 (0, rev annots)
+      |> fst
+  end
 
 (* (5) Annotate *)
 fun annotate_types ctxt t =