Fixed root environment bug.

diff --git a/src/jrw/Environment.java b/src/jrw/Environment.java
index a93b149..57642e6 100644 (file)
--- a/src/jrw/Environment.java
+++ b/src/jrw/Environment.java
@@ -4,7 +4,7 @@ import java.util.*;
 import java.util.function.*;
 
 public class Environment {
-    public static final Environment root = new Environment();
+    public static final Environment root = new Environment(null);
     private static final ThreadLocal<Environment> current = new ThreadLocal<>();
     public final Environment parent;
     private Map<Variable<?>, Object> data = Collections.emptyMap();