--- a/core/src/luan/modules/Utils.java	Tue Mar 29 18:09:51 2016 -0600
+++ b/core/src/luan/modules/Utils.java	Tue Mar 29 19:58:39 2016 -0600
@@ -8,7 +8,6 @@
 import java.io.File;
 import java.net.URL;
 import java.net.MalformedURLException;
-import luan.LuanState;
 import luan.LuanException;
 import luan.LuanTable;
 import luan.LuanFunction;
@@ -19,49 +18,49 @@
 
 	static final int bufSize = 8192;
 
-	private static void checkNotNull(LuanState luan,Object v,String expected,int pos) throws LuanException {
+	private static void checkNotNull(Object v,String expected,int pos) throws LuanException {
 		if( v == null )
-			throw new LuanException(luan,"bad argument #"+pos+" ("+expected+" expected, got nil)");
+			throw new LuanException("bad argument #"+pos+" ("+expected+" expected, got nil)");
 	}
 
-	public static void checkNotNull(LuanState luan,String s,int pos) throws LuanException {
-		checkNotNull(luan,s,"string",pos);
+	public static void checkNotNull(String s,int pos) throws LuanException {
+		checkNotNull(s,"string",pos);
 	}
 
-	public static void checkNotNull(LuanState luan,String s) throws LuanException {
-		checkNotNull(luan,s,1);
+	public static void checkNotNull(String s) throws LuanException {
+		checkNotNull(s,1);
 	}
 
-	public static void checkNotNull(LuanState luan,byte[] b,int pos) throws LuanException {
-		checkNotNull(luan,b,"binary",pos);
+	public static void checkNotNull(byte[] b,int pos) throws LuanException {
+		checkNotNull(b,"binary",pos);
 	}
 
-	public static void checkNotNull(LuanState luan,byte[] b) throws LuanException {
-		checkNotNull(luan,b,1);
+	public static void checkNotNull(byte[] b) throws LuanException {
+		checkNotNull(b,1);
 	}
 
-	public static void checkNotNull(LuanState luan,LuanTable t,int pos) throws LuanException {
-		checkNotNull(luan,t,"table",pos);
+	public static void checkNotNull(LuanTable t,int pos) throws LuanException {
+		checkNotNull(t,"table",pos);
 	}
 
-	public static void checkNotNull(LuanState luan,LuanTable t) throws LuanException {
-		checkNotNull(luan,t,1);
+	public static void checkNotNull(LuanTable t) throws LuanException {
+		checkNotNull(t,1);
 	}
 
-	public static void checkNotNull(LuanState luan,Number n,int pos) throws LuanException {
-		checkNotNull(luan,n,"number",pos);
+	public static void checkNotNull(Number n,int pos) throws LuanException {
+		checkNotNull(n,"number",pos);
 	}
 
-	public static void checkNotNull(LuanState luan,Number n) throws LuanException {
-		checkNotNull(luan,n,1);
+	public static void checkNotNull(Number n) throws LuanException {
+		checkNotNull(n,1);
 	}
 
-	public static void checkNotNull(LuanState luan,LuanFunction fn,int pos) throws LuanException {
-		checkNotNull(luan,fn,"function",pos);
+	public static void checkNotNull(LuanFunction fn,int pos) throws LuanException {
+		checkNotNull(fn,"function",pos);
 	}
 
-	public static void checkNotNull(LuanState luan,LuanFunction fn) throws LuanException {
-		checkNotNull(luan,fn,1);
+	public static void checkNotNull(LuanFunction fn) throws LuanException {
+		checkNotNull(fn,1);
 	}
 
 	public static String readAll(Reader in)