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-rw-r--r--src/gen_lib/sail2_string.lem2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/gen_lib/sail2_string.lem b/src/gen_lib/sail2_string.lem
index d0e40ad4..ba3a2d51 100644
--- a/src/gen_lib/sail2_string.lem
+++ b/src/gen_lib/sail2_string.lem
@@ -31,7 +31,7 @@ let string_append = stringAppend
val maybeIntegerOfString : string -> maybe integer
let maybeIntegerOfString _ = Nothing (* TODO FIXME *)
-declare ocaml target_rep function maybeIntegerOfString = `(fun s -> match int_of_string_opt s with None -> None | Some i -> Some (Nat_big_num.of_int i))`
+declare ocaml target_rep function maybeIntegerOfString = `(fun s -> match int_of_string s with i -> Some (Nat_big_num.of_int i) | exception Failure _ -> None )`
(***********************************************
* end stuff that should be in Lem Num_extra *