diff --git a/src/core/org/luaj/vm2/Print.java b/src/core/org/luaj/vm2/Print.java
index 37143783..a682957b 100644
--- a/src/core/org/luaj/vm2/Print.java
+++ b/src/core/org/luaj/vm2/Print.java
@@ -361,7 +361,7 @@ public class Print extends Lua {
 				break;
 			case LuaValue.TFUNCTION:
 				ps.print( ( v instanceof LuaClosure )?
-					((LuaClosure)v).p.tojstring(): v.tojstring() );
+					((LuaClosure)v).p.toString(): v.tojstring() );
 				break;
 			case LuaValue.TUSERDATA:
 				Object o = v.touserdata();
diff --git a/src/core/org/luaj/vm2/Prototype.java b/src/core/org/luaj/vm2/Prototype.java
index 99b30b64..25db33a1 100644
--- a/src/core/org/luaj/vm2/Prototype.java
+++ b/src/core/org/luaj/vm2/Prototype.java
@@ -44,8 +44,8 @@ public class Prototype {
 	public int maxstacksize;
 
 	
-	public String tojstring() {
-		return source + ":" + linedefined;
+	public String toString() {
+		return source + ":" + linedefined+"-"+lastlinedefined;
 	}
 	
 	/** Get the name of a local variable.
diff --git a/src/core/org/luaj/vm2/lib/CoroutineLib.java b/src/core/org/luaj/vm2/lib/CoroutineLib.java
index 6f670452..e63853dd 100644
--- a/src/core/org/luaj/vm2/lib/CoroutineLib.java
+++ b/src/core/org/luaj/vm2/lib/CoroutineLib.java
@@ -46,6 +46,7 @@ public class CoroutineLib extends VarArgFunction {
 			"create", "resume", "running", "status", "yield", "wrap" },
 			CREATE);
 		env.set("coroutine", t);
+		PackageLib.instance.LOADED.set("coroutine", t);
 		return t;
 	}
 	
diff --git a/src/core/org/luaj/vm2/lib/DebugLib.java b/src/core/org/luaj/vm2/lib/DebugLib.java
index 2aaf9f36..eb1689ac 100644
--- a/src/core/org/luaj/vm2/lib/DebugLib.java
+++ b/src/core/org/luaj/vm2/lib/DebugLib.java
@@ -114,6 +114,7 @@ public class DebugLib extends VarArgFunction {
 		LuaTable t = new LuaTable();
 		bind(t, DebugLib.class, NAMES, DEBUG);
 		env.set("debug", t);
+		PackageLib.instance.LOADED.set("debug", t);
 		return t;
 	}
 	
diff --git a/src/core/org/luaj/vm2/lib/IoLib.java b/src/core/org/luaj/vm2/lib/IoLib.java
index b6226841..f85ba35a 100644
--- a/src/core/org/luaj/vm2/lib/IoLib.java
+++ b/src/core/org/luaj/vm2/lib/IoLib.java
@@ -197,6 +197,7 @@ public class IoLib extends OneArgFunction {
 		
 		// return the table
 		env.set("io", t);
+		PackageLib.instance.LOADED.set("io", t);
 		return t;
 	}
 
diff --git a/src/core/org/luaj/vm2/lib/MathLib.java b/src/core/org/luaj/vm2/lib/MathLib.java
index a8fdcecd..20a00612 100644
--- a/src/core/org/luaj/vm2/lib/MathLib.java
+++ b/src/core/org/luaj/vm2/lib/MathLib.java
@@ -61,6 +61,7 @@ public class MathLib extends OneArgFunction {
 		((MathLibV) t.get("randomseed")).mathlib = this;
 		((MathLibV) t.get("random"    )).mathlib = this;
 		env.set("math", t);
+		PackageLib.instance.LOADED.set("math", t);
 		return t;
 	}
 
diff --git a/src/core/org/luaj/vm2/lib/OsLib.java b/src/core/org/luaj/vm2/lib/OsLib.java
index 334feed5..aaa6d229 100644
--- a/src/core/org/luaj/vm2/lib/OsLib.java
+++ b/src/core/org/luaj/vm2/lib/OsLib.java
@@ -90,6 +90,7 @@ public class OsLib extends VarArgFunction {
 		LuaTable t = new LuaTable();
 		bind(t, this.getClass(), NAMES, CLOCK);
 		env.set("os", t);
+		PackageLib.instance.LOADED.set("os", t);
 		return t;
 	}
 
diff --git a/src/core/org/luaj/vm2/lib/PackageLib.java b/src/core/org/luaj/vm2/lib/PackageLib.java
index 4784cce1..32dd9f12 100644
--- a/src/core/org/luaj/vm2/lib/PackageLib.java
+++ b/src/core/org/luaj/vm2/lib/PackageLib.java
@@ -21,7 +21,6 @@
 ******************************************************************************/
 package org.luaj.vm2.lib;
 
-import java.io.IOException;
 import java.io.InputStream;
 import java.io.PrintStream;
 
@@ -92,6 +91,7 @@ public class PackageLib extends OneArgFunction {
 						lua_loader     = new PkgLibV(env,"lua_loader", OP_LUA_LOADER,this),
 						java_loader    = new PkgLibV(env,"java_loader", OP_JAVA_LOADER,this),
 				}) }) );
+		LOADED.set("package", PACKAGE);
 		return env;
 	}
 
@@ -212,6 +212,8 @@ public class PackageLib extends OneArgFunction {
 		LuaFunction f = LuaThread.getCallstackFunction(1);
 		if ( f == null )
 			error("no calling function");
+		if ( ! f.isclosure() )
+			error("'module' not called from a Lua function");
 		f.setfenv(module);
 		
 		// apply the functions
@@ -321,6 +323,7 @@ public class PackageLib extends OneArgFunction {
 	}
 
 	public static Varargs loadlib( Varargs args ) {
+		args.checkstring(1);
 		return varargsOf(NIL, valueOf("dynamic libraries not enabled"), valueOf("absent"));
 	}
 
diff --git a/src/core/org/luaj/vm2/lib/StringLib.java b/src/core/org/luaj/vm2/lib/StringLib.java
index ce058639..4ebe4c43 100644
--- a/src/core/org/luaj/vm2/lib/StringLib.java
+++ b/src/core/org/luaj/vm2/lib/StringLib.java
@@ -51,6 +51,7 @@ public class StringLib extends OneArgFunction {
 		instance = t;
 		if ( LuaString.s_metatable == null )
 			LuaString.s_metatable = tableOf( new LuaValue[] { INDEX, t } );
+		PackageLib.instance.LOADED.set("string", t);
 		return t;
 	}
 	
diff --git a/src/core/org/luaj/vm2/lib/TableLib.java b/src/core/org/luaj/vm2/lib/TableLib.java
index 1ed89e70..cfa2dcd4 100644
--- a/src/core/org/luaj/vm2/lib/TableLib.java
+++ b/src/core/org/luaj/vm2/lib/TableLib.java
@@ -36,6 +36,7 @@ public class TableLib extends OneArgFunction {
 		bind(t, TableLibV.class, new String[] {
 			"remove", "concat", "insert", "sort", "foreach", "foreachi", } );
 		env.set("table", t);
+		PackageLib.instance.LOADED.set("table", t);
 		return t;
 	}
 	
diff --git a/src/jse/org/luaj/vm2/lib/jse/LuajavaLib.java b/src/jse/org/luaj/vm2/lib/jse/LuajavaLib.java
index 0c145071..442bdef2 100644
--- a/src/jse/org/luaj/vm2/lib/jse/LuajavaLib.java
+++ b/src/jse/org/luaj/vm2/lib/jse/LuajavaLib.java
@@ -45,6 +45,7 @@ import org.luaj.vm2.LuaValue;
 import org.luaj.vm2.Varargs;
 import org.luaj.vm2.lib.BaseLib;
 import org.luaj.vm2.lib.OneArgFunction;
+import org.luaj.vm2.lib.PackageLib;
 import org.luaj.vm2.lib.ThreeArgFunction;
 import org.luaj.vm2.lib.TwoArgFunction;
 import org.luaj.vm2.lib.VarArgFunction;
@@ -72,10 +73,6 @@ public class LuajavaLib extends VarArgFunction {
 
 	private static LuaValue LENGTH = valueOf("length");
 	
-	public static void install(LuaValue globals) {
-		globals.set("luajava", new LuajavaLib());
-	}
-	
 	public LuajavaLib() {
 	}
 
@@ -86,6 +83,7 @@ public class LuajavaLib extends VarArgFunction {
 				LuaTable t = new LuaTable();
 				bind( t, LuajavaLib.class, NAMES, BINDCLASS );
 				env.set("luajava", t);
+				PackageLib.instance.LOADED.set("luajava", t);
 				return t;
 			}
 			case BINDCLASS: {
diff --git a/test/lua/errors/args.lua b/test/lua/errors/args.lua
index 4b780bea..eafdabf0 100644
--- a/test/lua/errors/args.lua
+++ b/test/lua/errors/args.lua
@@ -132,12 +132,11 @@ local function arglists(typesets)
 	return ipairs(argsets)	
 end
 
-
-local function lookup( name ) 
+function lookup( name ) 
 	return loadstring('return '..name)()
 end
 
-local function invoke( name, arglist )
+function invoke( name, arglist )
 	local s,c = pcall(lookup, name)
 	if not s then return s,c end
 	return pcall(c, unpack(arglist,1,arglist.n or #arglist))
diff --git a/test/lua/errors/mathlibargs.lua b/test/lua/errors/mathlibargs.lua
index b3aa5adf..22594618 100644
--- a/test/lua/errors/mathlibargs.lua
+++ b/test/lua/errors/mathlibargs.lua
@@ -1,6 +1,12 @@
 package.path = "?.lua;test/lua/errors/?.lua"
 require 'args'
 
+local tostring = tostring
+_G.tostring = function(x) 
+	local s = tostring(x)
+	return type(x)=='number' and #s>4 and (s:sub(1,5)..'...') or s
+end
+
 -- arg type tests for math library functions
 local somenumber = {1,0.75,'-1','-0.25'}
 local somepositive = {1,0.75,'2', '2.5'}
diff --git a/test/lua/errors/modulelibargs.lua b/test/lua/errors/modulelibargs.lua
index 63133f8c..711cc7c1 100644
--- a/test/lua/errors/modulelibargs.lua
+++ b/test/lua/errors/modulelibargs.lua
@@ -22,28 +22,25 @@ checkallerrors('package.seeall',{notatable},'bad argument')
 
 -- module tests - require special rigging
 banner('module')
-print( pcall( function() 
-	checkallpass('module',{{20001}})
-end ) )
-print( pcall( function() 
-	checkallpass('module',{{20002},{package.seeall}})
-end ) )
-print( pcall( function() 
-	checkallpass('module',{{20003},{package.seeall},{function() end}})
-end ) )
-print( pcall( function() 
-	checkallerrors('module',{{aboolean,atable,function() end}},'bad argument')
-	checkallerrors('module',{{aboolean,atable,function() end},{package.seeall}},'bad argument')
-end ) )
-print( pcall( function() 
-	checkallerrors('module',{{'testmodule1'},{'pqrs'}},'attempt to call')
-end ) )
-print( pcall( function() 
-	checkallerrors('module',{{'testmodule2'},{aboolean}},'attempt to call')
-end ) )
-print( pcall( function() 
-	checkallerrors('module',{{'testmodule3'},{athread}},'attempt to call')
-end ) )
-print( pcall( function() 
-	checkallerrors('module',{{'testmodule4'},{atable}},'attempt to call')
-end ) )
+checkallerrors('module',{{20001},{nil,package.seeall,n=2},{nil,function()end,n=2}},"'module' not called from a Lua function")
+checkallerrors('module',{{'testmodule1'},{nil,'pqrs',aboolean,athread,atable}},"'module' not called from a Lua function")
+checkallerrors('module',{{aboolean,atable,function() end}},'bad argument')
+checkallerrors('module',{{aboolean,atable,function() end},{package.seeall}},'bad argument')
+
+-- enclose each invokation in its own function
+function invoke( name, arglist )
+	assert( name=='module', 'module rig used for '..name )
+	local func = function()
+		module( unpack(arglist,1,arglist.n or #arglist) )
+	end
+	return pcall( func )
+end
+checkallpass('module',{{'foo1',20001}})
+checkallpass('module',{{'foo2',20002},{package.seeall}})
+checkallpass('module',{{'foo3',20003},{package.seeall},{function() end}})
+checkallerrors('module',{{aboolean,atable,function() end}},'bad argument')
+checkallerrors('module',{{aboolean,atable,function() end},{package.seeall}},'bad argument')
+checkallerrors('module',{{'testmodule2'},{'pqrs'}},'attempt to call')
+checkallerrors('module',{{'testmodule3'},{aboolean}},'attempt to call')
+checkallerrors('module',{{'testmodule4'},{athread}},'attempt to call')
+checkallerrors('module',{{'testmodule5'},{atable}},'attempt to call')