diff -r 637f20154de6 -r 74965ce81297 src/Tools/isac/MathEngBasic/rewrite.sml
--- a/src/Tools/isac/MathEngBasic/rewrite.sml	Thu Apr 29 12:43:50 2021 +0200
+++ b/src/Tools/isac/MathEngBasic/rewrite.sml	Thu Apr 29 14:13:11 2021 +0200
@@ -4,6 +4,7 @@
 
 signature REWRITE =
 sig
+  exception NO_REWRITE
   val calculate_: theory -> string * Eval_Def.eval_fn -> term -> (term * (string * thm)) option
   val eval__true: theory -> int -> term list -> (term * term) list -> Rule_Set.T -> term list * bool
   val eval_prog_expr: theory -> Rule_Set.T -> term -> term
@@ -25,7 +26,6 @@
   val lim_deriv: int Unsynchronized.ref
 
 \<^isac_test>\<open>
-  exception NO_REWRITE
   val rewrite__: theory -> int -> (term * term) list -> Rule_Def.rew_ord_ ->
     Rule_Set.T -> bool -> thm -> term -> (term * term list) option
   val rewrite__set_: theory -> int -> bool -> (term * term) list -> Rule_Set.T -> term -> (term * term list) option