From e366323ed81f3177b0513c400d821359be53dc46 Mon Sep 17 00:00:00 2001
From: Evan Martin <martine@danga.com>
Date: Sun, 19 Dec 2010 16:35:28 -0800
Subject: initialize pointer

---
 src/eval_env.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/eval_env.h b/src/eval_env.h
index cc61a38..517066d 100644
--- a/src/eval_env.h
+++ b/src/eval_env.h
@@ -12,6 +12,7 @@ struct Env {
 // A standard scope, which contains a mapping of variables to values
 // as well as a pointer to a parent scope.
 struct BindingEnv : public Env {
+  BindingEnv() : parent_(NULL) {}
   virtual string LookupVariable(const string& var) {
     map<string, string>::iterator i = bindings_.find(var);
     if (i != bindings_.end())
-- 
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