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-rw-r--r--src/ast_util.ml7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/ast_util.ml b/src/ast_util.ml
index f7574b9d..968cb320 100644
--- a/src/ast_util.ml
+++ b/src/ast_util.ml
@@ -244,6 +244,13 @@ and nexp_simp_aux = function
when Big_int.equal c1 (Big_int.negate c2) -> n
| _, _ -> Nexp_minus (n1, n2)
end
+ | Nexp_neg n ->
+ begin
+ let (Nexp_aux (n_simp, _) as n) = nexp_simp n in
+ match n_simp with
+ | Nexp_constant c -> Nexp_constant (Big_int.negate c)
+ | _ -> Nexp_neg n
+ end
| Nexp_app (Id_aux (Id "div",_) as id,[n1;n2]) ->
begin
let (Nexp_aux (n1_simp, _) as n1) = nexp_simp n1 in