From 753d5d0689f9d89ceab38f7060f5514b340220cd Mon Sep 17 00:00:00 2001
From: Daniel Selsam <daniel.selsam@gmail.com>
Date: Thu, 21 Jan 2016 17:09:34 -0800
Subject: [PATCH] fix(library/blast/grind/intro_elim_lemmas): need to copy expr

---
 src/library/blast/grinder/intro_elim_lemmas.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/library/blast/grinder/intro_elim_lemmas.cpp b/src/library/blast/grinder/intro_elim_lemmas.cpp
index 3365cd39f..ee9582621 100644
--- a/src/library/blast/grinder/intro_elim_lemmas.cpp
+++ b/src/library/blast/grinder/intro_elim_lemmas.cpp
@@ -82,7 +82,7 @@ optional<name> get_intro_target(tmp_type_context & ctx, name const & c) {
         expr local = ctx.mk_tmp_local(binding_domain(type));
         type = ctx.try_to_pi(instantiate(binding_body(type), local));
     }
-    expr const & fn = get_app_fn(ctx.whnf(type));
+    expr const fn = get_app_fn(ctx.whnf(type));
     if (is_constant(fn))
         return optional<name>(const_name(fn));
     else