From e0d6e04493006d82758a9f393853dc97e82a533d Mon Sep 17 00:00:00 2001
From: Nikolaj Bjorner <nbjorner@microsoft.com>
Date: Mon, 20 Dec 2021 16:09:39 -0800
Subject: [PATCH] fix c++

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
---
 src/api/c++/z3++.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/api/c++/z3++.h b/src/api/c++/z3++.h
index 91ab6d106..7ac4eacdc 100644
--- a/src/api/c++/z3++.h
+++ b/src/api/c++/z3++.h
@@ -3799,6 +3799,7 @@ namespace z3 {
     }
     inline expr re_diff(expr const& a, expr const& b) {
         check_context(a, b);
+        context& ctx = a.ctx();
         Z3_ast r = Z3_mk_re_diff(ctx, a, b);
         ctx.check_error();
         return expr(ctx, r);