diff --git a/src/core/org/luaj/vm2/LuaValue.java b/src/core/org/luaj/vm2/LuaValue.java
index 8cec3de4..2cec897b 100644
--- a/src/core/org/luaj/vm2/LuaValue.java
+++ b/src/core/org/luaj/vm2/LuaValue.java
@@ -21,6 +21,8 @@
 ******************************************************************************/
 package org.luaj.vm2;
 
+import org.luaj.vm2.Varargs.SubVarargs;
+
 
 /**
  * Base class for all concrete lua type values.  
@@ -3387,8 +3389,8 @@ public class LuaValue extends Varargs {
 		switch ( v.length ) {
 		case 0: return NONE;
 		case 1: return v[0];
-		case 2: return new PairVarargs(v[0],v[1]); 
-		default: return new ArrayVarargs(v,NONE);
+		case 2: return new Varargs.PairVarargs(v[0],v[1]); 
+		default: return new Varargs.ArrayVarargs(v,NONE);
 		}
 	}
 	
@@ -3403,8 +3405,8 @@ public class LuaValue extends Varargs {
 	public static Varargs varargsOf(final LuaValue[] v,Varargs r) { 
 		switch ( v.length ) {
 		case 0: return r;
-		case 1: return new PairVarargs(v[0],r);
-		default: return new ArrayVarargs(v,r);
+		case 1: return new Varargs.PairVarargs(v[0],r);
+		default: return new Varargs.ArrayVarargs(v,r);
 		}
 	}
 
@@ -3421,8 +3423,8 @@ public class LuaValue extends Varargs {
 		switch ( length ) {
 		case 0: return NONE;
 		case 1: return v[offset];
-		case 2: return new PairVarargs(v[offset+0],v[offset+1]);
-		default: return new ArrayPartVarargs(v,offset,length);
+		case 2: return new Varargs.PairVarargs(v[offset+0],v[offset+1]);
+		default: return new Varargs.ArrayPartVarargs(v,offset,length);
 		}
 	}
 
@@ -3439,8 +3441,8 @@ public class LuaValue extends Varargs {
 	public static Varargs varargsOf(final LuaValue[] v, final int offset, final int length,Varargs more) {
 		switch ( length ) {
 		case 0: return more;
-		case 1: return new PairVarargs(v[offset],more);
-		default: return new ArrayPartVarargs(v,offset,length,more);
+		case 1: return new Varargs.PairVarargs(v[offset],more);
+		default: return new Varargs.ArrayPartVarargs(v,offset,length,more);
 		}
 	}
 
@@ -3457,7 +3459,7 @@ public class LuaValue extends Varargs {
 	public static Varargs varargsOf(LuaValue v, Varargs r) {
 		switch ( r.narg() ) {
 		case 0: return v;
-		default: return new PairVarargs(v,r);
+		default: return new Varargs.PairVarargs(v,r);
 		}
 	}
 	
@@ -3474,8 +3476,8 @@ public class LuaValue extends Varargs {
 	 */
 	public static Varargs varargsOf(LuaValue v1,LuaValue v2,Varargs v3) { 
 		switch ( v3.narg() ) {
-		case 0: return new PairVarargs(v1,v2);
-		default: return new ArrayVarargs(new LuaValue[] {v1,v2},v3); 
+		case 0: return new Varargs.PairVarargs(v1,v2);
+		default: return new Varargs.ArrayVarargs(new LuaValue[] {v1,v2},v3); 
 		}
 	}
 	
@@ -3530,120 +3532,21 @@ public class LuaValue extends Varargs {
 		public int narg() { return 0; }
 		public LuaValue arg1() { return NIL; }
 		public String tojstring() { return "none"; }
+		public Varargs subargs(final int start) { return this; }
+
 	}
 	
-	/** Varargs implemenation backed by an array of LuaValues 
-	 * <p>
-	 * This is an internal class not intended to be used directly.
-	 * Instead use the corresponding static methods on LuaValue. 
-	 *  
-	 * @see LuaValue#varargsOf(LuaValue[])
-	 * @see LuaValue#varargsOf(LuaValue[], Varargs)
+	/**
+	 * Create a {@code Varargs} instance containing arguments starting at index {@code start}
+	 * @param start the index from which to include arguments, where 1 is the first argument.
+	 * @return Varargs containing argument { start, start+1,  ... , narg-start-1 }
 	 */
-	static final class ArrayVarargs extends Varargs {
-		private final LuaValue[] v;
-		private final Varargs r;
-		/** Construct a Varargs from an array of LuaValue. 
-		 * <p>
-		 * This is an internal class not intended to be used directly.
-		 * Instead use the corresponding static methods on LuaValue. 
-		 *  
-		 * @see LuaValue#varargsOf(LuaValue[])
-		 * @see LuaValue#varargsOf(LuaValue[], Varargs)
-		 */
-		ArrayVarargs(LuaValue[] v, Varargs r) {
-			this.v = v;
-			this.r = r ;
-		}
-		public LuaValue arg(int i) {
-			return i >=1 && i<=v.length? v[i - 1]: r.arg(i-v.length);
-		}
-		public int narg() {
-			return v.length+r.narg();
-		}
-		public LuaValue arg1() { return v.length>0? v[0]: r.arg1(); }
-	}
-
-	/** Varargs implemenation backed by an array of LuaValues 
-	 * <p>
-	 * This is an internal class not intended to be used directly.
-	 * Instead use the corresponding static methods on LuaValue. 
-	 *  
-	 * @see LuaValue#varargsOf(LuaValue[], int, int)
-	 * @see LuaValue#varargsOf(LuaValue[], int, int, Varargs)
-	 */
-	static final class ArrayPartVarargs extends Varargs {
-		private final int offset;
-		private final LuaValue[] v;
-		private final int length;
-		private final Varargs more;
-		/** Construct a Varargs from an array of LuaValue. 
-		 * <p>
-		 * This is an internal class not intended to be used directly.
-		 * Instead use the corresponding static methods on LuaValue. 
-		 *  
-		 * @see LuaValue#varargsOf(LuaValue[], int, int)
-		 */
-		ArrayPartVarargs(LuaValue[] v, int offset, int length) {
-			this.v = v;
-			this.offset = offset;
-			this.length = length;
-			this.more = NONE;
-		}
-		/** Construct a Varargs from an array of LuaValue and additional arguments. 
-		 * <p>
-		 * This is an internal class not intended to be used directly.
-		 * Instead use the corresponding static method on LuaValue. 
-		 *  
-		 * @see LuaValue#varargsOf(LuaValue[], int, int, Varargs)
-		 */
-		public ArrayPartVarargs(LuaValue[] v, int offset, int length, Varargs more) {
-			this.v = v;
-			this.offset = offset;
-			this.length = length;
-			this.more = more;
-		}
-		public LuaValue arg(int i) {
-			return i>=1&&i<=length? v[i+offset-1]: more.arg(i-length);
-		}
-		public int narg() {
-			return length + more.narg();
-		}
-		public LuaValue arg1() { 
-			return length>0? v[offset]: more.arg1(); 
-		}
-	}
-
-	/** Varargs implemenation backed by two values.  
-	 * <p>
-	 * This is an internal class not intended to be used directly.
-	 * Instead use the corresponding static method on LuaValue. 
-	 *  
-	 * @see LuaValue#varargsOf(LuaValue, Varargs)
-	 */
-	static final class PairVarargs extends Varargs {
-		private final LuaValue v1;
-		private final Varargs v2;
-		/** Construct a Varargs from an two LuaValue. 
-		 * <p>
-		 * This is an internal class not intended to be used directly.
-		 * Instead use the corresponding static method on LuaValue. 
-		 *  
-		 * @see LuaValue#varargsOf(LuaValue, Varargs)
-		 */
-		PairVarargs(LuaValue v1, Varargs v2) {
-			this.v1 = v1;
-			this.v2 = v2;
-		}
-		public LuaValue arg(int i) {
-			return i==1? v1: v2.arg(i-1);
-		}
-		public int narg() {
-			return 1+v2.narg();
-		}
-		public LuaValue arg1() { 
-			return v1; 
-		}
+	public Varargs subargs(final int start) {
+		if (start == 1)
+			return this;
+		if (start > 1)
+			return NONE;
+		return new Varargs.SubVarargs(this, start, 1);
 	}
 
 }
diff --git a/src/core/org/luaj/vm2/Varargs.java b/src/core/org/luaj/vm2/Varargs.java
index 340bdd20..15ce8dce 100644
--- a/src/core/org/luaj/vm2/Varargs.java
+++ b/src/core/org/luaj/vm2/Varargs.java
@@ -505,7 +505,7 @@ public abstract class Varargs {
 		int end = narg();
 		switch ( end-start ) {
 		case 0: return arg(start);
-		case 1: return new LuaValue.PairVarargs(arg(start),arg(end));
+		case 1: return new Varargs.PairVarargs(arg(start),arg(end));
 		}
 		return end<start? (Varargs) LuaValue.NONE: new SubVarargs(this,start,end); 
 	}
@@ -514,7 +514,7 @@ public abstract class Varargs {
 	 * Implementation of Varargs for use in the Varargs.subargs() function.
 	 * @see Varargs#subargs(int)
 	 */
-	private static class SubVarargs extends Varargs {
+	static class SubVarargs extends Varargs {
 		private final Varargs v;
 		private final int start;
 		private final int end;
@@ -533,5 +533,146 @@ public abstract class Varargs {
 		public int narg() {
 			return end+1-start;
 		}
+		public Varargs subargs(final int start) {
+			if (start == 1)
+				return this;
+			final int newstart = this.start + start - 1;
+			if (start > 0) {
+				if (newstart >= this.end)
+					return LuaValue.NONE;
+				if (newstart == this.end)
+					return v.arg(this.end);
+				if (newstart == this.end-1)
+					return new Varargs.PairVarargs(v.arg(this.end-1), v.arg(this.end));
+				return new SubVarargs(v, newstart, this.end);
+			}
+			return new SubVarargs(v, newstart, this.end);
+		}
+	}
+
+	/** Varargs implemenation backed by two values.  
+	 * <p>
+	 * This is an internal class not intended to be used directly.
+	 * Instead use the corresponding static method on LuaValue. 
+	 *  
+	 * @see LuaValue#varargsOf(LuaValue, Varargs)
+	 */
+	static final class PairVarargs extends Varargs {
+		private final LuaValue v1;
+		private final Varargs v2;
+		/** Construct a Varargs from an two LuaValue. 
+		 * <p>
+		 * This is an internal class not intended to be used directly.
+		 * Instead use the corresponding static method on LuaValue. 
+		 *  
+		 * @see LuaValue#varargsOf(LuaValue, Varargs)
+		 */
+		PairVarargs(LuaValue v1, Varargs v2) {
+			this.v1 = v1;
+			this.v2 = v2;
+		}
+		public LuaValue arg(int i) {
+			return i==1? v1: v2.arg(i-1);
+		}
+		public int narg() {
+			return 1+v2.narg();
+		}
+		public LuaValue arg1() { 
+			return v1; 
+		}
+		public Varargs subargs(final int start) {
+			if (start == 1)
+				return this;
+			if (start == 2)
+				return v2;
+			if (start > 2)
+				return v2.subargs(start - 1);
+			return new SubVarargs(this, start, 2);
+		}
+	}
+
+	/** Varargs implemenation backed by an array of LuaValues 
+	 * <p>
+	 * This is an internal class not intended to be used directly.
+	 * Instead use the corresponding static methods on LuaValue. 
+	 *  
+	 * @see LuaValue#varargsOf(LuaValue[])
+	 * @see LuaValue#varargsOf(LuaValue[], Varargs)
+	 */
+	static final class ArrayVarargs extends Varargs {
+		private final LuaValue[] v;
+		private final Varargs r;
+		/** Construct a Varargs from an array of LuaValue. 
+		 * <p>
+		 * This is an internal class not intended to be used directly.
+		 * Instead use the corresponding static methods on LuaValue. 
+		 *  
+		 * @see LuaValue#varargsOf(LuaValue[])
+		 * @see LuaValue#varargsOf(LuaValue[], Varargs)
+		 */
+		ArrayVarargs(LuaValue[] v, Varargs r) {
+			this.v = v;
+			this.r = r ;
+			for (int i = 0; i < v.length; ++i)
+				if (v[i] == null)
+					throw new IllegalArgumentException("nulls in array");
+		}
+		public LuaValue arg(int i) {
+			return i >=1 && i<=v.length? v[i - 1]: r.arg(i-v.length);
+		}
+		public int narg() {
+			return v.length+r.narg();
+		}
+		public LuaValue arg1() { return v.length>0? v[0]: r.arg1(); }
+	}
+
+	/** Varargs implemenation backed by an array of LuaValues 
+	 * <p>
+	 * This is an internal class not intended to be used directly.
+	 * Instead use the corresponding static methods on LuaValue. 
+	 *  
+	 * @see LuaValue#varargsOf(LuaValue[], int, int)
+	 * @see LuaValue#varargsOf(LuaValue[], int, int, Varargs)
+	 */
+	static final class ArrayPartVarargs extends Varargs {
+		private final int offset;
+		private final LuaValue[] v;
+		private final int length;
+		private final Varargs more;
+		/** Construct a Varargs from an array of LuaValue. 
+		 * <p>
+		 * This is an internal class not intended to be used directly.
+		 * Instead use the corresponding static methods on LuaValue. 
+		 *  
+		 * @see LuaValue#varargsOf(LuaValue[], int, int)
+		 */
+		ArrayPartVarargs(LuaValue[] v, int offset, int length) {
+			this.v = v;
+			this.offset = offset;
+			this.length = length;
+			this.more = LuaValue.NONE;
+		}
+		/** Construct a Varargs from an array of LuaValue and additional arguments. 
+		 * <p>
+		 * This is an internal class not intended to be used directly.
+		 * Instead use the corresponding static method on LuaValue. 
+		 *  
+		 * @see LuaValue#varargsOf(LuaValue[], int, int, Varargs)
+		 */
+		public ArrayPartVarargs(LuaValue[] v, int offset, int length, Varargs more) {
+			this.v = v;
+			this.offset = offset;
+			this.length = length;
+			this.more = more;
+		}
+		public LuaValue arg(int i) {
+			return i>=1&&i<=length? v[i+offset-1]: more.arg(i-length);
+		}
+		public int narg() {
+			return length + more.narg();
+		}
+		public LuaValue arg1() { 
+			return length>0? v[offset]: more.arg1(); 
+		}
 	}
 }
diff --git a/src/core/org/luaj/vm2/lib/DebugLib.java b/src/core/org/luaj/vm2/lib/DebugLib.java
index a0ebc7f5..80508d74 100644
--- a/src/core/org/luaj/vm2/lib/DebugLib.java
+++ b/src/core/org/luaj/vm2/lib/DebugLib.java
@@ -55,7 +55,7 @@ import org.luaj.vm2.Varargs;
  * To instantiate and use it directly, 
  * link it into your globals table via {@link LuaValue#load(LuaValue)} using code such as:
  * <pre> {@code
- * LuaTable _G = new LuaTable();
+ * Globals _G = new Globals();
  * _G.load(new DebugLib());
  * } </pre>
  * Doing so will ensure the library is properly initialized 
@@ -112,7 +112,7 @@ public class DebugLib extends OneArgFunction {
 	int lastline;
 	int bytecodes;
 	
-	public LuaTable call(LuaValue env) {
+	public LuaValue call(LuaValue env) {
 		globals = env.checkglobals();
 		globals.debuglib = this;
 		LuaTable debug = new LuaTable();
@@ -148,7 +148,7 @@ public class DebugLib extends OneArgFunction {
 	final class gethook extends VarArgFunction { 
 		public Varargs invoke(Varargs args) {
 			return varargsOf(
-					hookfunc,
+					hookfunc != null? hookfunc: NIL,
 					valueOf((hookcall?"c":"")+(hookline?"l":"")+(hookrtrn?"r":"")),
 					valueOf(hookcount));
 		}
@@ -237,7 +237,8 @@ public class DebugLib extends OneArgFunction {
 			LuaThread thread = args.isthread(a)? args.checkthread(a++): globals.running_thread; 
 			int level = args.checkint(a++);
 			int local = args.checkint(a++);
-			return callstack(thread).getCallFrame(level).getLocal(local);
+			CallFrame f = callstack(thread).getCallFrame(level);
+			return f != null? f.getLocal(local): NONE;
 		}
 	}
 
@@ -282,7 +283,7 @@ public class DebugLib extends OneArgFunction {
 	
 	// debug.sethook ([thread,] hook, mask [, count])
 	final class sethook extends VarArgFunction { 
-		public Varargs call(Varargs args) {
+		public Varargs invoke(Varargs args) {
 			int a=1;
 			LuaThread thread = args.isthread(a)? args.checkthread(a++): globals.running_thread; 
 			LuaValue func    = args.optfunction(a++, null);
@@ -312,7 +313,8 @@ public class DebugLib extends OneArgFunction {
 			int level = args.checkint(a++);
 			int local = args.checkint(a++);
 			LuaValue value = args.arg(a++);
-			return callstack(thread).getCallFrame(level).setLocal(local, value);
+			CallFrame f = callstack(thread).getCallFrame(level); 
+			return f != null? f.setLocal(local, value): NONE;
 		}
 	}
 
@@ -383,7 +385,7 @@ public class DebugLib extends OneArgFunction {
 			if ( func instanceof LuaClosure ) {
 				LuaClosure c = (LuaClosure) func;
 				if ( c.upValues != null && up > 0 && up <= c.upValues.length ) {
-					return userdataOf(c.upValues[up-1].hashCode());
+					return valueOf(c.upValues[up-1].hashCode());
 				}
 			}
 			return NIL;
@@ -397,6 +399,7 @@ public class DebugLib extends OneArgFunction {
 			int n1 = args.checkint(2);
 			LuaValue f2 = args.checkfunction(3);
 			int n2 = args.checkint(4);
+			f1.checkclosure().upValues[n1] = f2.checkclosure().upValues[n2];
 			return NONE;
 		}
 	}
diff --git a/test/junit/org/luaj/vm2/ErrorsTest.java b/test/junit/org/luaj/vm2/ErrorsTest.java
index b8bda0a7..264d3d4d 100644
--- a/test/junit/org/luaj/vm2/ErrorsTest.java
+++ b/test/junit/org/luaj/vm2/ErrorsTest.java
@@ -52,6 +52,7 @@ public class ErrorsTest extends ScriptDrivenTest {
 		runTest("baselibargs");      
 	}
 	public void testCoroutineLibArgs()  { runTest("coroutinelibargs"); }	
+	public void testDebugLibArgs()      { runTest("debuglibargs"); }	
 	public void testIoLibArgs()         { runTest("iolibargs");        }	
 	public void testMathLibArgs()       { runTest("mathlibargs");      }	
 	public void testModuleLibArgs()     { runTest("modulelibargs");    }	
diff --git a/test/lua/debuglib.lua b/test/lua/debuglib.lua
index a89ff2ba..57ac8cda 100644
--- a/test/lua/debuglib.lua
+++ b/test/lua/debuglib.lua
@@ -211,11 +211,27 @@ local tryhooks = function(mask)
 			tostring(d1)..' ' ) 
 end
 
---[[
 tryhooks("c")
 tryhooks("r")
 tryhooks("l")
 tryhooks("crl")
---]]
 
- 
\ No newline at end of file
+print( '----- debug.getupvalueid' )
+local x=1, y=2
+function a()
+	return function()
+		return x,y
+	end
+end
+a1 = a()
+a2 = a()
+print('debug.getupvalue(a1,1)', debug.getupvalue(a1,1))
+print('debug.getupvalue(a1,2)', debug.getupvalue(a1,2))
+print('debug.getupvalue(a2,1)', debug.getupvalue(a2,1))
+print('debug.getupvalue(a2,2)', debug.getupvalue(a2,2))
+print('debug.getupvalueid(a1,1) == debug.getupvalueid(a1,1)', debug.getupvalueid(a1,1) == debug.getupvalueid(a1,1))
+print('debug.getupvalueid(a1,1) == debug.getupvalueid(a2,1)', debug.getupvalueid(a1,1) == debug.getupvalueid(a2,1))
+print('debug.getupvalueid(a1,2) == debug.getupvalueid(a1,2)', debug.getupvalueid(a1,2) == debug.getupvalueid(a1,2))
+print('debug.getupvalueid(a1,2) == debug.getupvalueid(a2,2)', debug.getupvalueid(a1,2) == debug.getupvalueid(a2,2))
+
+v
diff --git a/test/lua/errors/debuglibargs.lua b/test/lua/errors/debuglibargs.lua
new file mode 100644
index 00000000..110a98bf
--- /dev/null
+++ b/test/lua/errors/debuglibargs.lua
@@ -0,0 +1,150 @@
+package.path = "?.lua;test/lua/errors/?.lua"
+require 'args'
+
+local alevel = {25,'25'}
+local afuncorlevel = {afunction,25,'25'}
+local notafuncorlevel = {nil,astring,aboolean,athread}
+local notafuncorthread = {nil,astring,aboolean}
+
+-- debug.debug()
+banner('debug.debug - no tests')
+
+-- debug.gethook ([thread])
+banner('debug.gethook')
+checkallpass('debug.gethook',{})
+
+-- debug.getinfo ([thread,] f [, what])
+banner('debug.getinfo')
+local awhat = {"","n","flnStu"}
+local notawhat = {"qzQZ"}
+checkallpass('debug.getinfo',{afuncorlevel})
+checkallpass('debug.getinfo',{somethread,afuncorlevel})
+checkallpass('debug.getinfo',{afuncorlevel,awhat})
+checkallpass('debug.getinfo',{somethread,afuncorlevel,awhat})
+checkallerrors('debug.getinfo',{},'function or level')
+checkallerrors('debug.getinfo',{notafuncorlevel},'function or level')
+checkallerrors('debug.getinfo',{somefunction,nonstring}, 'string expected')
+checkallerrors('debug.getinfo',{notafuncorthread,somefunction}, 'string expected')
+checkallerrors('debug.getinfo',{nonthread,somefunction,{astring}}, 'string expected')
+checkallerrors('debug.getinfo',{somethread,somefunction,notawhat}, 'invalid option')
+
+-- debug.getlocal ([thread,] f, local)
+banner('debug.getlocal')
+local p,q = 'p','q';
+f = function(x,y)
+	print('f: x,y,a,b,p,q', x, y, a, b, p, q)
+	local a,b = x,y
+	local t = coroutine.running()
+	checkallpass('debug.getlocal',{{f,1},{1,'2'}})
+	checkallpass('debug.getlocal',{{t},{f},{1}})
+	checkallerrors('debug.getlocal',{},'number expected')
+	checkallerrors('debug.getlocal',{afuncorlevel,notanumber},'number expected')
+	checkallerrors('debug.getlocal',{notafuncorlevel,somenumber}, 'number expected')
+	checkallerrors('debug.getlocal',{{t},afuncorlevel}, 'got no value')
+	checkallerrors('debug.getlocal',{nonthread,{f},{1,'2'}}, 'number expected')
+	checkallerrors('debug.getlocal',{{t},{100},{1}}, 'level out of range')
+end
+f(1,2)
+
+-- debug.getmetatable (value)
+banner('debug.getmetatable')
+checkallpass('debug.getmetatable',{anylua})
+checkallerrors('debug.getmetatable',{},'value expected')
+
+-- debug.getregistry ()
+banner('debug.getregistry')
+checkallpass('debug.getregistry',{})
+checkallpass('debug.getregistry',{anylua})
+
+-- debug.getupvalue (f, up)
+banner('debug.getupvalue')
+checkallpass('debug.getupvalue',{{f},{1,'2'}})
+checkallerrors('debug.getupvalue',{},'number expected')
+checkallerrors('debug.getupvalue',{notafunction,{1,'2'}}, 'function expected')
+checkallerrors('debug.getupvalue',{{f},notanumber}, 'number expected')
+
+-- debug.getuservalue (u)
+checkallpass('debug.getuservalue',{})
+checkallpass('debug.getuservalue',{anylua})
+
+-- debug.sethook ([thread,] hook, mask [, count])
+local ahookstr = {"cr","l"}
+checkallpass('debug.sethook',{})
+checkallpass('debug.sethook',{somenil,ahookstr})
+checkallpass('debug.sethook',{somefunction,ahookstr})
+checkallpass('debug.sethook',{{nil,athread,n=2},somefunction,ahookstr})
+checkallerrors('debug.sethook',{{astring,afunction,aboolean}},'string expected')
+checkallerrors('debug.sethook',{{astring,afunction,aboolean},{nil,afunction,n=2},ahookstr},'string expected')
+
+-- debug.setlocal ([thread,] level, local, value)
+banner('debug.setlocal')
+local p,q = 'p','q';
+f = function(x,y)
+	print('f: x,y,a,b,p,q', x, y, a, b, p, q)
+	local a,b = x,y
+	local t = coroutine.running()
+	checkallpass('debug.setlocal',{{1},{1},{nil,'foo',n=2}})
+	print('f: x,y,a,b,p,q', x, y, a, b, p, q)
+	checkallpass('debug.setlocal',{{t},{1},{2},{nil,'bar',n=2}})
+	print('f: x,y,a,b,p,q', x, y, a, b, p, q)
+	checkallerrors('debug.setlocal',{},'number expected')
+	checkallerrors('debug.setlocal',{{1}},'value expected')
+	checkallerrors('debug.setlocal',{{1},{1}}, 'value expected')
+	checkallerrors('debug.setlocal',{{t},{1},{2}}, 'value expected')
+	checkallerrors('debug.setlocal',{{atable,astring},{1}}, 'number expected')
+	checkallerrors('debug.setlocal',{{1},nonnumber}, 'value expected')
+	checkallerrors('debug.setlocal',{{atable,astring},{1},{1},{nil,'foo',n=2}}, 'number expected')
+	checkallerrors('debug.setlocal',{{10},{1},{'foo'}}, 'level out of range')
+	return p,q
+end
+f(1,2)
+
+-- debug.setmetatable (value, table)
+banner('debug.setmetatable')
+checkallpass('debug.setmetatable',{anylua,{atable,nil,n=2}})
+checkallerrors('debug.setmetatable',{},'nil or table')
+checkallerrors('debug.setmetatable',{anylua},'nil or table')
+
+-- debug.setupvalue (f, up, value)
+banner('debug.setupvalue')
+checkallpass('debug.setupvalue',{{f},{2,'3'},{nil,aboolean,astring,n=3}})
+print('p,q', p, q)
+checkallerrors('debug.setupvalue',{},'value expected')
+checkallerrors('debug.setupvalue',{{f}},'value expected')
+checkallerrors('debug.setupvalue',{{f},{1}},'value expected')
+checkallerrors('debug.setupvalue',{notafunction,{2}}, 'value expected')
+checkallerrors('debug.setupvalue',{{f},notanumber}, 'value expected')
+
+-- debug.setuservalue (udata, value)
+banner('debug.setuservalue')
+checkallerrors('debug.setuservalue',{},'userdata expected')
+checkallerrors('debug.setuservalue',{anylua},'userdata expected')
+checkallerrors('debug.setuservalue',{anylua,somestring},'userdata expected')
+
+-- debug.traceback ([thread,] [message [, level]])
+banner('debug.traceback')
+local t = coroutine.running()
+checkallpass('debug.traceback',{})
+checkallpass('debug.traceback',{{astring}})
+checkallpass('debug.traceback',{{astring},{anumber}})
+checkallpass('debug.traceback',{{t}})
+checkallpass('debug.traceback',{{t},{astring}})
+checkallpass('debug.traceback',{{t},{astring},{anumber}})
+checkallpass('debug.traceback',{{afunction,aboolean,atable}})
+checkallpass('debug.traceback',{{afunction,aboolean,atable},notanumber})
+
+-- debug.upvalueid (f, n)
+banner('debug.upvalueid')
+checkallpass('debug.upvalueid',{{f},{1,'2'}})
+checkallerrors('debug.upvalueid',{},'number expected')
+checkallerrors('debug.upvalueid',{notafunction,{1,'2'}}, 'function expected')
+checkallerrors('debug.upvalueid',{{f},notanumber}, 'number expected')
+
+-- debug.upvaluejoin (f1, n1, f2, n2)
+banner('debug.upvaluejoin')
+checkallpass('debug.upvaluejoin',{{f},{1,'2'},{f},{1,'2'}})
+checkallerrors('debug.upvaluejoin',{},'number expected')
+checkallerrors('debug.upvaluejoin',{notafunction,{1,'2'}}, 'function expected')
+checkallerrors('debug.upvaluejoin',{{f},notanumber}, 'number expected')
+checkallerrors('debug.upvaluejoin',{{f},{1},notafunction,{1,'2'}}, 'function expected')
+checkallerrors('debug.upvaluejoin',{{f},{1},{f},notanumber}, 'number expected')