diff --git a/src/core/org/luaj/lib/BaseLib.java b/src/core/org/luaj/lib/BaseLib.java
index 9189dc1c..9e0c517d 100644
--- a/src/core/org/luaj/lib/BaseLib.java
+++ b/src/core/org/luaj/lib/BaseLib.java
@@ -13,14 +13,11 @@ import java.io.PrintStream;
 import org.luaj.vm.CallInfo;
 import org.luaj.vm.LClosure;
 import org.luaj.vm.LFunction;
-import org.luaj.vm.LInteger;
 import org.luaj.vm.LNil;
-import org.luaj.vm.LNumber;
 import org.luaj.vm.LString;
 import org.luaj.vm.LTable;
 import org.luaj.vm.LValue;
 import org.luaj.vm.Lua;
-import org.luaj.vm.LuaErrorException;
 import org.luaj.vm.LuaState;
 import org.luaj.vm.Platform;
 
@@ -134,21 +131,38 @@ public class BaseLib extends LFunction {
 			vm.resettop();
 			break;
 		}
-		case IPAIRS:
-		case PAIRS: {			
+		case IPAIRS: {			
 			LTable t = vm.checktable(2);
 			vm.resettop();
-			vm.pushjavafunction( (id==IPAIRS)? inext: next );
+			vm.pushjavafunction( inext );
+			vm.pushlvalue( t );
+			vm.pushinteger( 0 );
+			break;
+		}
+		case PAIRS: {
+			LTable t = vm.checktable(2);
+			vm.resettop();
+			vm.pushjavafunction( next );
 			vm.pushlvalue( t );
 			vm.pushnil();
 			break;
 		}
-		case INEXT:
+		case INEXT: {
+			  int i = vm.checkint(3) + 1;
+			  LTable t = vm.checktable(2);
+			  LValue v = t.get(i);
+			  vm.resettop();
+			  if ( !v.isNil() ) {
+				  vm.pushinteger(i);
+				  vm.pushlvalue(v);
+			  }
+			  break;
+		}
 		case NEXT: {
 			LTable t = vm.checktable(2);
-			LValue v = vm.topointer(3);
+			LValue k = vm.topointer(3);
 			vm.resettop();
-			t.next(vm,v,(id==INEXT));
+			t.next(vm,k,false);
 			break;
 		}
 		case GETMETATABLE: {
@@ -230,7 +244,7 @@ public class BaseLib extends LFunction {
 		}
 		
 		case LOADFILE:
-			loadfile(vm, vm.optstring(2,""));
+			loadfile(vm, vm.optstring(2,null));
 			break;
 			
 		case TONUMBER: {
@@ -411,6 +425,13 @@ public class BaseLib extends LFunction {
 	}
 
 	// return true if loaded, false if error put onto the stack
+	/** Load a chunk from an input stream, leaving it on the stack if successful,
+	 * then close the input stream if it is not STDIN
+	 * 
+	 * @param vm LuaState to load into
+	 * @param is input stream to load from 
+	 * @return true if loaded and only item on stack, false if nil+error put onto stack
+	 */
 	static boolean loadis(LuaState vm, InputStream is, String chunkname ) {
 		try {
 			vm.resettop();
@@ -426,12 +447,17 @@ public class BaseLib extends LFunction {
 	}
 	
 
-	// return true if loaded, false if error put onto stack
-	public static boolean loadfile( LuaState vm, String fileName ) {
+	/** Load a file into a chunk given a filename, leaving it on the stack if successful
+	 * 
+	 * @param vm LuaState to load into
+	 * @param fileName file to load, or null to use STDIN
+	 * @return true if loaded and only item on stack, false if nil+error put onto stack
+	 */
+	private static boolean loadfile( LuaState vm, String fileName ) {
 		InputStream is;
 		
 		String script;
-		if ( ! "".equals(fileName) ) {
+		if ( fileName != null ) {
 			script = fileName;
 			is = Platform.getInstance().openFile(fileName);
 			if ( is == null ) {
@@ -439,8 +465,8 @@ public class BaseLib extends LFunction {
 				return false;
 			}
 		} else {
-			is = STDIN;
-			script = "-";
+			is = STDIN != null? STDIN: new ByteArrayInputStream(new byte[0]);
+			script = "-";			
 		}
 		
 		// use vm to load the script
@@ -449,12 +475,11 @@ public class BaseLib extends LFunction {
 	
 	// if load succeeds, return 0 for success, 1 for error (as per lua spec)
 	private void dofile( LuaState vm ) {
-		String filename = vm.checkstring(2);
+		String filename = vm.optstring(2,null);
 		if ( loadfile( vm, filename ) ) {
-			int s = vm.pcall(1, 0, 0);
-			setResult( vm, LInteger.valueOf( s!=0? 1: 0 ) );
+			vm.call(0, 0);
 		} else {
-			vm.error("cannot open "+filename);
+			vm.error( vm.tostring(-1) );
 		}
 	}
 
diff --git a/src/core/org/luaj/lib/StringLib.java b/src/core/org/luaj/lib/StringLib.java
index fabc2dcd..66975fab 100644
--- a/src/core/org/luaj/lib/StringLib.java
+++ b/src/core/org/luaj/lib/StringLib.java
@@ -21,12 +21,16 @@
 ******************************************************************************/
 package org.luaj.lib;
 
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+
+import org.luaj.compiler.DumpState;
+import org.luaj.vm.LClosure;
 import org.luaj.vm.LFunction;
 import org.luaj.vm.LNumber;
 import org.luaj.vm.LString;
 import org.luaj.vm.LTable;
 import org.luaj.vm.LValue;
-import org.luaj.vm.Lua;
 import org.luaj.vm.LuaState;
 
 
@@ -204,7 +208,15 @@ public class StringLib extends LFunction {
 	 * TODO: port dumping code as optional add-on
 	 */
 	static void dump( LuaState vm ) {
-		vm.error("dump() not supported");
+		LFunction f = vm.checkfunction(2);
+		ByteArrayOutputStream baos = new ByteArrayOutputStream();
+		try {
+			DumpState.dump( ((LClosure)f).p, baos, true );
+			vm.resettop();
+			vm.pushlstring(baos.toByteArray());
+		} catch (IOException e) {
+			vm.error( e.getMessage() );
+		}
 	}
 
 	/** 
diff --git a/src/test/errors/baselibargs.lua b/src/test/errors/baselibargs.lua
index 155e321d..5e9da711 100644
--- a/src/test/errors/baselibargs.lua
+++ b/src/test/errors/baselibargs.lua
@@ -1,7 +1,6 @@
 package.path = "?.lua;src/test/errors/?.lua"
 require 'args'
 
-
 -- arg types for basic library functions
 
 -- assert
@@ -17,7 +16,8 @@ checkallerrors('collectgarbage',{notanil},'bad argument #1')
 
 -- dofile
 banner('dofile')
-checkallpass('dofile', {{nil,'src/test/errors/args.lua'}})
+checkallpass('dofile', {})
+checkallpass('dofile', {{'src/test/errors/args.lua'}})
 checkallerrors('dofile', {{'args.lua'}}, 'cannot open args.lua')
 checkallerrors('dofile', {nonstring}, 'bad argument #1')
 
@@ -50,11 +50,17 @@ checkallerrors('load', {somefunction,{afunction,atable}}, 'bad argument #2')
 -- loadfile
 banner('loadfile')
 checkallpass('loadfile', {})
+checkallpass('loadfile', {{'bogus'}})
+checkallpass('loadfile', {{'src/test/errors/args.lua'}})
+checkallpass('loadfile', {{'args.lua'}})
 checkallerrors('loadfile', {nonstring}, 'bad argument #1')
 
 -- loadstring
 banner('loadstring')
-checkallpass('loadstring', {{'return'},{nil,astring}})
+checkallpass('loadstring', {{'return'}})
+checkallpass('loadstring', {{'return'},{'mychunk'}})
+checkallpass('loadstring', {{'return a ... b'},{'mychunk'}})
+checkallerrors('loadstring', {{'return a ... b'},{'mychunk'}},'hello')
 checkallerrors('loadstring', {notastring,{nil,astring,anumber}}, 'bad argument #1')
 checkallerrors('loadstring', {{'return'},{afunction,atable}}, 'bad argument #2')
 
diff --git a/src/test/errors/modulelibargs.lua b/src/test/errors/modulelibargs.lua
index 5a55b169..8282bc83 100644
--- a/src/test/errors/modulelibargs.lua
+++ b/src/test/errors/modulelibargs.lua
@@ -5,13 +5,13 @@ require 'args'
 
 -- require
 banner('require')
-checkallpass('require',{{'math'}})
+checkallpass('require',{{'math','coroutine','package','string','table'}},true)
 checkallerrors('require',{{anumber}},'not found')
 checkallerrors('require',{{anil,aboolean,afunction,atable}},'bad argument')
 
 -- package.loadlib
 banner('package.loadlib')
-checkallpass('package.loadlib',{{'foo'},{'bar'}})
+checkallpass('package.loadlib',{{'foo'},{'bar'}},true)
 checkallerrors('package.loadlib',{notastring},'bad argument')
 
 -- package.seeall
@@ -20,11 +20,30 @@ checkallpass('package.seeall',{sometable})
 checkallerrors('package.seeall',{notatable},'bad argument')
 
 
--- module (last because it pretty much breaks this chunk)
+-- module tests - require special rigging
+banner('module')
 print( pcall( function() 
-	banner('module')
-	checkallpass('module',{somenumber,{package.seeall},{nil,afunction}})
-	checkallerrors('module',{{aboolean,atable,afunction}},'bad argument')
-	checkallerrors('module',{{aboolean,atable,afunction},{package.seeall}},'bad argument')
-	checkallerrors('module',{somestring,{astring,anumber,aboolean,atable}},'attempt to call a')
+	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 ) )
diff --git a/src/test/errors/stringlibargs.lua b/src/test/errors/stringlibargs.lua
index 1467e271..0ee44ad3 100644
--- a/src/test/errors/stringlibargs.lua
+++ b/src/test/errors/stringlibargs.lua
@@ -12,17 +12,27 @@ checkallerrors('string.byte',{somestring,{astring,afunction,atable}},'bad argume
 checkallerrors('string.byte',{notastring,{nil,111}},'bad argument')
 
 -- string.char
-banner('string.char')
-checkallpass('string.char',{{nil,0,1,40,127,128,255,'0','1','255','1.2',1.2}})
-checkallpass('string.char',{{0,127,255},{0,127,255}})
-checkallpass('string.char',{})
-checkallerrors('string.char',{{-1,256}},'bad argument #1')
-checkallerrors('string.char',{notanumber,{23,'45',6.7}},'bad argument #1')
-checkallerrors('string.char',{{23,'45',6.7},nonnumber},'bad argument #2')
+function string_char(...)
+	return string.byte( string.char( ... ) )
+end
+banner('string_char')
+checkallpass('string.char',{{60}})
+checkallpass('string.char',{{60},{70}})
+checkallpass('string.char',{{60},{70},{80}})
+checkallpass('string_char',{{nil,0,9,40,127,128,255,'0','9','255','9.2',9.2}})
+checkallpass('string_char',{{0,127,255},{0,127,255}})
+checkallpass('string_char',{})
+checkallerrors('string_char',{},'bad argument #1')
+checkallerrors('string_char',{{-1,256}},'bad argument #1')
+checkallerrors('string_char',{notanumber,{23,'45',6.7}},'bad argument #1')
+checkallerrors('string_char',{{23,'45',6.7},nonnumber},'bad argument #2')
 
 -- string.dump
 banner('string.dump')
-checkallpass('string.dump',{{afunction}})
+local someupval = 435
+local function funcwithupvals() return someupval end
+checkallpass('string.dump',{{function() return 123 end}})
+checkallpass('string.dump',{{funcwithupvals}})
 checkallerrors('string.dump',{notafunction},'bad argument')
 
 -- string.find
diff --git a/src/test/java/org/luaj/vm/ScriptDrivenTest.java b/src/test/java/org/luaj/vm/ScriptDrivenTest.java
index 66734d93..2bee28f1 100644
--- a/src/test/java/org/luaj/vm/ScriptDrivenTest.java
+++ b/src/test/java/org/luaj/vm/ScriptDrivenTest.java
@@ -27,11 +27,7 @@ public class ScriptDrivenTest extends TestCase {
 			InterruptedException {
 
 		// set platform relative to directory
-		Platform.setInstance(new J2sePlatform() {
-			public InputStream openFile(String fileName) {
-				return super.openFile(basedir+"/"+fileName);
-			}			
-		});
+		Platform.setInstance(new J2sePlatform());
 		
 		// new lua state
 		LuaState state = Platform.newLuaState();