diff --git a/src/core/org/luaj/lib/BaseLib.java b/src/core/org/luaj/lib/BaseLib.java
index e45aa7ec..a43a1306 100644
--- a/src/core/org/luaj/lib/BaseLib.java
+++ b/src/core/org/luaj/lib/BaseLib.java
@@ -214,7 +214,7 @@ public class BaseLib extends LFunction {
 				LString s = vm.tolstring(2);
 				int base = 10;
 				if ( vm.isnumber(3) ) {
-					base = vm.tointeger(3);
+					base = vm.tolnumber(3).toJavaInt();
 					if ( base < 2 || base > 36 )
 						vm.error("bad argument #2 to '?' (base out of range)");
 				}
@@ -281,9 +281,9 @@ public class BaseLib extends LFunction {
 		}
 		case SELECT: {
 			checkargexists(vm,2,Lua.LUA_TNUMBER);
-			int n = vm.gettop();
+			int n = vm.gettop();			
 			if ( vm.isnumber(2) ) {
-				int index = vm.tointeger(2);
+				int index = vm.tolnumber(2).toJavaInt();
 				if ( index < 0 )
 					index += n-1;
 				if ( index <= 0 )
@@ -339,11 +339,11 @@ public class BaseLib extends LFunction {
 			int i=1,j;
 			if ( n >= 3 ) {
 				checkargtype(vm,3,Lua.LUA_TNUMBER);
-				i = vm.tointeger(3);
+				i = vm.tolnumber(3).toJavaInt();
 			}
 			if ( n >= 4 ) {
 				checkargtype(vm,4,Lua.LUA_TNUMBER);
-				j = vm.tointeger(4);
+				j = vm.tolnumber(4).toJavaInt();
 			} else {
 				j = list.luaLength();
 			}
diff --git a/src/core/org/luaj/vm/LTable.java b/src/core/org/luaj/vm/LTable.java
index a24c4061..6116390e 100644
--- a/src/core/org/luaj/vm/LTable.java
+++ b/src/core/org/luaj/vm/LTable.java
@@ -636,58 +636,64 @@ public class LTable extends LValue {
 	}
 
 	/**
-	 * Leave nil on top, or index,value pair
-	 * @param vm
-	 * @param index
+	 * Leave key,value pair on top, or nil if at end of list.
+	 * @param vm the LuaState to leave the values on
+	 * @param index index to start search
 	 */
-	public void next(LuaState vm, LValue index) {
+	public void next(LuaState vm, LValue key ) {
+
+		// find place to start looking
+		int start = nextKey2StartIndex( vm, key );
 		
-		// look through vector first
-		int start = index.toJavaInt();
-		if ( start > 0 && start <= m_vector.length ) {
-			for ( int i=start; i<m_vector.length; i++ ) {
+		// look in vector part
+		int n = m_vector.length;
+		if ( start < n ) {
+			for ( int i=start; i<n; i++ ) {
 				if ( m_vector[i] != LNil.NIL ) {
 					vm.pushinteger(i+1);
 					vm.pushlvalue(m_vector[i]);
 					return;
 				}
 			}
-		}		
+			start = n;
+		}
 
-		// look up key first
-		if ( index != LNil.NIL ) {
-			if ( m_hashEntries != 0 && (start <= 0 || start > m_vector.length) ) {
-				for ( int i=0; i<m_hashKeys.length; i++ ) { 
-					if ( index.luaBinCmpUnknown( Lua.OP_EQ, m_hashKeys[i] ) ) {
-						start = m_vector.length+i+1;
-						break;
-					}
+		// look in hash part
+		if ( m_hashKeys != null ) {
+			for ( int i=start-n; i<m_hashKeys.length; i++ ) { 
+				if ( m_hashKeys[i] != null ) {
+					vm.pushlvalue(m_hashKeys[i]);
+					vm.pushlvalue(m_hashValues[i]);
+					return;
 				}
 			}
 		}
 		
-		// start looking
-		if ( start < m_vector.length ) {
-			if ( m_arrayEntries != 0 ) {
-				for ( int i=start; i<m_vector.length; i++ ) {
-					if ( m_vector[i] != LNil.NIL ) {
-						vm.pushinteger(i+1);
-						vm.pushlvalue(m_vector[i]);
-						return;
-					}
-				}
-				start = m_vector.length;
-			}
-			if ( m_hashEntries != 0 ) {
-				for ( int i=start-m_vector.length; i<m_hashKeys.length; i++ ) { 
-					if ( index.luaBinCmpUnknown( Lua.OP_EQ, m_hashKeys[i] ) ) {
-						vm.pushlvalue(m_hashKeys[i]);
-						vm.pushlvalue(m_hashValues[i]);
-						return;
-					}
-				}
-			}
-		}
+		// nothing found, return nil.
 		vm.pushnil();
 	}
+	
+	private int nextKey2StartIndex( LuaState vm, LValue key ) {
+		if ( key == LNil.NIL )
+			return 0;
+		
+		int n = m_vector.length;
+		if ( n > 0 && key.isInteger() ) {
+			final int index = key.toJavaInt() - 1;
+			if ( index >= 0 && index < n ) {
+				if ( m_vector[index] == LNil.NIL )
+					vm.error( "invalid key to 'next'" );
+				return index + 1;
+			}
+		}
+		
+		if ( m_hashKeys == null )
+			vm.error( "invalid key to 'next'" );
+		
+		int slot = findSlot( key );
+		if ( m_hashKeys[slot] == null ) 
+			vm.error( "invalid key to 'next'" );
+		
+		return n + slot + 1;
+	}
 }
diff --git a/src/debug/org/luaj/debug/DebugLuaState.java b/src/debug/org/luaj/debug/DebugLuaState.java
index 0888b99c..1f536362 100644
--- a/src/debug/org/luaj/debug/DebugLuaState.java
+++ b/src/debug/org/luaj/debug/DebugLuaState.java
@@ -135,7 +135,8 @@ public class DebugLuaState extends LuaState implements DebugRequestListener {
         if (exiting) {
             throw new AbortException("aborted by debug client");
         }
-
+        
+/*
         if (DebugUtils.IS_DEBUG) {
             DebugUtils.println("entered debugHook on pc=" + pc + "...Line: " + getFileLine(cc));
             for (int j = 0; j <= cc; j++) {
@@ -143,7 +144,7 @@ public class DebugLuaState extends LuaState implements DebugRequestListener {
                 dumpStack(j);                    
             }
         }        
-        
+  */      
         synchronized (this) {
             while (bSuspendOnStart) {
                 try {
diff --git a/src/test/java/org/luaj/vm/LuaJTest.java b/src/test/java/org/luaj/vm/LuaJTest.java
index f656c0eb..eda119dd 100644
--- a/src/test/java/org/luaj/vm/LuaJTest.java
+++ b/src/test/java/org/luaj/vm/LuaJTest.java
@@ -78,6 +78,10 @@ public class LuaJTest extends TestCase {
 		runTest( "metatables" );
 	}
 
+	public void testNext() throws IOException, InterruptedException {
+		runTest( "next" );
+	}
+
 	public void testPcalls() throws IOException, InterruptedException {
 		runTest( "pcalls" );
 	}
@@ -117,7 +121,7 @@ public class LuaJTest extends TestCase {
 	public void testUpvalues2() throws IOException, InterruptedException {
 		runTest( "upvalues2" );
 	}
-//*/
+
 	private void runTest( String testName ) throws IOException, InterruptedException {
 
 		// new lua state 
diff --git a/src/test/res/baselib.lua b/src/test/res/baselib.lua
index 1abf58d9..155eecce 100644
--- a/src/test/res/baselib.lua
+++ b/src/test/res/baselib.lua
@@ -1,20 +1,20 @@
 -- unit tests for functions in BaseLib.java
+local ids = {}
+local function id(obj)
+	local v = ids[obj]
+	if v then
+		return v
+	end
+	table.insert(ids,obj)
+	ids[obj] = type(obj)..'.'..tostring(#ids)
+	return ids[obj]
+end 
+
+-- print
+print()
+print(11)
+print("abc",123,nil,"pqr")
 
--- error, pcall
-print( 'pcall(error)', pcall(error) )
-print( 'pcall(error,"msg")', pcall(error,"msg") )
-print( 'pcall(error,"msg",1)', pcall(error,"msg",1) )
-print( 'pcall(error,"msg",2)', pcall(error,"msg",2) )
-local function le(level) 
-	error("msg",level) 
-end
-function ge(level) 
-	error("msg",level)
-end
-for i = 0,4 do
-	print( 'pcall(le,i)', i, pcall(le,i) )
-	print( 'pcall(ge,i)', i, pcall(ge,i) )
-end
 
 -- assert
 print( 'assert(true)', assert(true) )
@@ -27,7 +27,36 @@ print( 'pcall(assert,nil,"msg")', pcall(assert,nil,"msg") )
 print( 'pcall(assert,false,"msg","msg2")', pcall(assert,false,"msg","msg2") )
 
 -- collectgarbage (not supported)
+print( 'collectgarbage("count")', id(collectgarbage("count")))
+print( 'collectgarbage("collect")', collectgarbage("collect"))
+print( 'collectgarbage("count")', id(collectgarbage("count")))
+
 -- dofile (not supported)
+-- ipairs
+print( 'pcall(ipairs)', pcall(ipairs) )
+print( 'pcall(ipairs,nil)', pcall(ipairs,nil) )
+print( 'pcall(ipairs,"a")', pcall(ipairs,"a") )
+print( 'pcall(ipairs,1)', pcall(ipairs,1) )
+for k,v in ipairs({}) do print('ipairs1',k,v)end
+for k,v in ipairs({'one','two'}) do print('ipairs2',k,v)end
+for k,v in ipairs({aa='aaa',bb='bbb'}) do print('ipairs3',k,v)end
+for k,v in ipairs({aa='aaa',bb='bbb','one','two'}) do print('ipairs4',k,v)end
+for k,v in ipairs({[30]='30',[20]='20'}) do print('ipairs5',k,v)end
+
+-- load
+-- loadfile
+-- loadstring
+
+-- pairs
+print( 'pcall(pairs)', pcall(pairs) )
+print( 'pcall(pairs,nil)', pcall(pairs,nil) )
+print( 'pcall(pairs,"a")', pcall(pairs,"a") )
+print( 'pcall(pairs,1)', pcall(pairs,1) )
+for k,v in pairs({}) do print('pairs1',k,v)end
+for k,v in pairs({'one','two'}) do print('pairs2',k,v)end
+for k,v in pairs({aa='aaa',bb='bbb'}) do print('pairs3',k,v)end
+for k,v in pairs({aa='aaa',bb='bbb','one','two'}) do print('pairs4',k,v)end
+for k,v in pairs({[30]='30',[20]='20'}) do print('pairs5',k,v)end
 
 -- _G
 print( '_G["abc"] (before)', _G["abc"] )
@@ -67,16 +96,80 @@ print( 'pcall(setmetatable,nil)', pcall(setmetatable,nil) )
 print( 'pcall(setmetatable,"ABC")', pcall(setmetatable,"ABC") )
 print( 'pcall(setmetatable,function() end)', pcall(setmetatable,function() end) )
 
--- ipairs
--- load
--- loadfile
--- loadstring
--- next
--- pairs
--- print
--- rawget
--- rawset
+
+-- rawget,rawset
+local mt = {aa="aaa", bb="bbb"}
+mt.__index = mt
+mt.__newindex = mt
+local s = {cc="ccc", dd="ddd", }
+local t = {cc="ccc", dd="ddd"}
+setmetatable(t,mt)
+print( 'pcall(rawget)', pcall(rawget))
+print( 'pcall(rawget,"a")', pcall(rawget,"a"))
+print( 'pcall(rawget,s)', pcall(rawget,s))
+print( 'pcall(rawget,t)', pcall(rawget,t))
+
+function printtables()
+	function printtable(name,t)
+		print( '  '..name, t["aa"], t["bb"], t["cc"], t["dd"], t["ee"], t["ff"], t["gg"] )
+		print( '  '..name, 
+			rawget(t,"aa"), 
+			rawget(t,"bb"), 
+			rawget(t,"cc"), 
+			rawget(t,"dd"), 
+			rawget(t,"ee"), 
+			rawget(t,"ff"), 
+			rawget(t,"gg") ) 
+	end
+	printtable( 's', s )	
+	printtable( 't', t )	
+	printtable( 'mt', mt )	
+end
+printtables()
+print( 'pcall(rawset,s,"aa","www")', id(rawset(s,"aa","www")))
+printtables()
+print( 'pcall(rawset,s,"cc","xxx")', id(rawset(s,"cc","xxx")))
+printtables()
+print( 'pcall(rawset,t,"bb","yyy")', id(rawset(t,"aa","yyy")))
+printtables()
+print( 'pcall(rawset,t,"dd","zzz")', id(rawset(s,"dd","zzz")))
+printtables()
+
+printtables()
+print( 's["ee"]="ppp"' ); s["ee"]="ppp"
+printtables()
+print( 's["cc"]="qqq"' ); s["cc"]="qqq"
+printtables()
+print( 's["bb"]="rrr"' ); t["bb"]="rrr"
+printtables()
+print( 's["dd"]="sss"' ); t["dd"]="sss"
+printtables()
+print( 's["gg"]="ttt"' ); mt["gg"]="ttt"
+printtables()
+
+
 -- select
+print( 'pcall(select)', pcall(select) )
+print( 'select(1,11,22,33,44,55)', select(1,11,22,33,44,55) )
+print( 'select(2,11,22,33,44,55)', select(2,11,22,33,44,55) )
+print( 'select(3,11,22,33,44,55)', select(3,11,22,33,44,55) )
+print( 'select(4,11,22,33,44,55)', select(4,11,22,33,44,55) )
+print( 'pcall(select,5,11,22,33,44,55)', pcall(select,5,11,22,33,44,55) )
+print( 'pcall(select,6,11,22,33,44,55)', pcall(select,6,11,22,33,44,55) )
+print( 'pcall(select,7,11,22,33,44,55)', pcall(select,7,11,22,33,44,55) )
+print( 'pcall(select,0,11,22,33,44,55)', pcall(select,0,11,22,33,44,55) )
+print( 'pcall(select,-1,11,22,33,44,55)', pcall(select,-1,11,22,33,44,55) )
+print( 'pcall(select,-2,11,22,33,44,55)', pcall(select,-2,11,22,33,44,55) )
+print( 'pcall(select,-4,11,22,33,44,55)', pcall(select,-4,11,22,33,44,55) )
+print( 'pcall(select,-5,11,22,33,44,55)', pcall(select,-5,11,22,33,44,55) )
+print( 'pcall(select,-6,11,22,33,44,55)', pcall(select,-6,11,22,33,44,55) )
+print( 'pcall(select,1)', pcall(select,1) )
+print( 'pcall(select,select)', pcall(select,select) )
+print( 'pcall(select,{})', pcall(select,{}) )
+print( 'pcall(select,"2",11,22,33)', pcall(select,"2",11,22,33) )
+print( 'pcall(select,"abc",11,22,33)', pcall(select,"abc",11,22,33) )
+
+
 -- tonumber
 print( 'pcall(tonumber)', pcall(tostring) )
 print( 'pcall(tonumber,nil)', pcall(tonumber,nil) )
@@ -116,9 +209,9 @@ print( 'pcall(tostring,"abc","def")', pcall(tostring,"abc","def") )
 print( 'pcall(tostring,123)', pcall(tostring,123) )
 print( 'pcall(tostring,true)', pcall(tostring,true) )
 print( 'pcall(tostring,false)', pcall(tostring,false) )
-print( 'tostring(tostring):sub(1,10)', tostring(tostring):sub(1,10) )
-print( 'tostring(function() end)', tostring(function() end):sub(1,10) )
-print( 'tostring({"one","two",a="aa",b="bb"})', tostring({"one","two",a="aa",b="bb"}):sub(1,7) )
+print( 'tostring(tostring)', id(tostring(tostring)) )
+print( 'tostring(function() end)', id(tostring(function() end)) )
+print( 'tostring({"one","two",a="aa",b="bb"})', id(tostring({"one","two",a="aa",b="bb"})) )
 
 -- unpack
 print( 'pcall(unpack)', pcall(unpack) );
diff --git a/src/test/res/baselib.luac b/src/test/res/baselib.luac
index 08d29159..2ad89cde 100644
Binary files a/src/test/res/baselib.luac and b/src/test/res/baselib.luac differ
diff --git a/src/test/res/next.lua b/src/test/res/next.lua
new file mode 100644
index 00000000..36de2f0b
--- /dev/null
+++ b/src/test/res/next.lua
@@ -0,0 +1,23 @@
+-- unit tests for the next() function
+function donexts(tag,table,count)
+	local index = nil
+	for i = 1,count do
+		index,value = next(table,index)
+		print( tag, index, value )
+	end
+	print( tag, '--- -1', 'pcall( next, table,-1 )', pcall( next, table,-1 ) )
+	print( tag, '---  0', 'pcall( next, table,0 )', pcall( next, table,0 ) )
+	print( tag, '---"a"', 'pcall( next, table,"a" )', pcall( next, table,"a" ) )
+	print( tag, '--- 10', 'pcall( next, table, 10 )', pcall( next, table, 10 ) )
+end
+donexts( 'next1', {}, 2 )
+donexts( 'next2', {'one', 'two', 'three' }, 5 )
+donexts( 'next3', { aa='aaa', bb='bbb', cc='ccc', [20]='20', [30]='30'}, 7 )
+donexts( 'next4', {'one', 'two', 'three', aa='aaa', bb='bbb', cc='ccc', [20]='20', [30]='30'}, 9 )
+donexts( 'next5', {'one', 'two', 'three', [-1]='minus-one', [0]='zero' }, 7 )
+
+print( 'pcall(next)', pcall(next) )
+print( 'pcall(next,nil)', pcall(next,nil) )
+print( 'pcall(next,"a")', pcall(next,"a") )
+print( 'pcall(next,1)', pcall(next,1) )
+
diff --git a/src/test/res/next.luac b/src/test/res/next.luac
new file mode 100644
index 00000000..2bb95ed9
Binary files /dev/null and b/src/test/res/next.luac differ
diff --git a/src/test/res/pcalls.lua b/src/test/res/pcalls.lua
index 12aa0385..066a3ee8 100644
--- a/src/test/res/pcalls.lua
+++ b/src/test/res/pcalls.lua
@@ -34,3 +34,19 @@ print( 'pcall(ct,le,22,33,44)', pcall(ct,le,22,33,44) )
 print( "assert(true,'a','b','c')", assert( true, 'a', 'b', 'c' ) )
 print( "pcall(assert,true,'a','b','c')", pcall(assert, true, 'a', 'b', 'c' ) )
 print( "pcall(assert,false,'a','b','c')", pcall(assert, false, 'a', 'b', 'c' ) )
+
+-- more error, pcall tests
+print( 'pcall(error)', pcall(error) )
+print( 'pcall(error,"msg")', pcall(error,"msg") )
+print( 'pcall(error,"msg",1)', pcall(error,"msg",1) )
+print( 'pcall(error,"msg",2)', pcall(error,"msg",2) )
+local function le(level) 
+	error("msg",level) 
+end
+function ge(level) 
+	error("msg",level)
+end
+for i = 0,4 do
+	print( 'pcall(le,i)', i, pcall(le,i) )
+	print( 'pcall(ge,i)', i, pcall(ge,i) )
+end
diff --git a/src/test/res/pcalls.luac b/src/test/res/pcalls.luac
index 4063726f..fc04bd0d 100644
Binary files a/src/test/res/pcalls.luac and b/src/test/res/pcalls.luac differ