diff --git a/moo/kernel/generr.moo b/moo/kernel/generr.moo
index f8be819..4907489 100644
--- a/moo/kernel/generr.moo
+++ b/moo/kernel/generr.moo
@@ -75,6 +75,7 @@ class MyObject(Object)
 			'wrong class name'
 			'non-pointer class inheriting superclass with trailer size set'
 			'dcl not allowed'
+			'#native not allowed'
 			'wrong method name'
 			'duplicate method name'
 			'duplicate argument name'
diff --git a/moo/lib/comp.c b/moo/lib/comp.c
index f468287..9538936 100644
--- a/moo/lib/comp.c
+++ b/moo/lib/comp.c
@@ -5832,6 +5832,12 @@ static int compile_method_definition (moo_t* moo)
 		else if (is_token_symbol(moo, VOCA_NATIVE_S))
 		{
 			/* method(#native) */
+			if (moo->c->cls.self_oop->modname == moo->_nil)
+			{
+				set_syntax_error (moo, MOO_SYNERR_NATIVEBANNED, TOKEN_LOC(moo), TOKEN_NAME(moo));
+				return -1;
+			}
+
 			moo->c->mth.native = 1;
 			GET_TOKEN (moo);
 		}
@@ -5855,7 +5861,8 @@ static int compile_method_definition (moo_t* moo)
 
 	if (moo->c->mth.native)
 	{
-		moo_oow_t lit_idx;
+		moo_oow_t litidx, savedlen;
+		moo_oocs_t tmp;
 
 		if (TOKEN_TYPE(moo) != MOO_IOTOK_PERIOD)
 		{
@@ -5867,21 +5874,29 @@ static int compile_method_definition (moo_t* moo)
 		/* TODO: i can check if the native method is available at compile time by querying the module.
 		 *       do the check depending on the compiler option */
 
-
-		//moo->c->cls.self_oop->modname + "." + moo->c->mth.name and make symbol.
-#if 0
-		if (add_symbol_literal(moo, xxx, 0, &lit_idx) <= -1 ||
-		    !MOO_OOI_IN_METHOD_PREAMBLE_INDEX_RANGE(lit_idx))
+		/* combine the module name and the method name delimited by a period
+		 * when doing it, let me reuse the cls.modname buffer and restore it
+		 * back once done */
+		MOO_ASSERT (moo, MOO_CLASSOF(moo, moo->c->cls.self_oop->modname) == moo->_symbol);
+		savedlen = moo->c->cls.modname.len;
+		tmp.ptr = ((moo_oop_char_t)moo->c->cls.self_oop->modname)->slot;
+		tmp.len = MOO_OBJ_GET_SIZE(moo->c->cls.self_oop->modname);
+		if (copy_string_to (moo, &tmp, &moo->c->cls.modname, &moo->c->cls.modname_capa, 1, '\0') <= -1 ||
+		    copy_string_to (moo, &moo->c->mth.name, &moo->c->cls.modname, &moo->c->cls.modname_capa, 1, '.') <= -1 ||
+		    add_symbol_literal(moo, &moo->c->cls.modname, savedlen, &litidx) <= -1)
 		{
-			/* TODO: change error code */
-			set_syntax_error (moo, MOO_SYNERR_PFID, TOKEN_LOC(moo), MOO_NULL);
+			moo->c->cls.modname.len = savedlen;
 			return -1;
 		}
+		moo->c->cls.modname.len = savedlen;
+
+		/* the symbol added must be the first literal to the current method.
+		 * so this condition must be true. */
+		MOO_ASSERT (moo, MOO_OOI_IN_METHOD_PREAMBLE_INDEX_RANGE(litidx));
 
 		/* external named primitive containing a period. */
 		moo->c->mth.pftype = PFTYPE_NAMED; 
-		moo->c->mth.pfnum = lit_idx;
-#endif
+		moo->c->mth.pfnum = litidx;
 	}
 	else
 	{
diff --git a/moo/lib/err.c b/moo/lib/err.c
index bf440c5..bf38309 100644
--- a/moo/lib/err.c
+++ b/moo/lib/err.c
@@ -101,37 +101,38 @@ static moo_ooch_t synerrstr_29[] = {'c','o','n','t','r','a','d','i','c','t','o',
 static moo_ooch_t synerrstr_30[] = {'w','r','o','n','g',' ','c','l','a','s','s',' ','n','a','m','e','\0'};
 static moo_ooch_t synerrstr_31[] = {'n','o','n','-','p','o','i','n','t','e','r',' ','c','l','a','s','s',' ','i','n','h','e','r','i','t','i','n','g',' ','s','u','p','e','r','c','l','a','s','s',' ','w','i','t','h',' ','t','r','a','i','l','e','r',' ','s','i','z','e',' ','s','e','t','\0'};
 static moo_ooch_t synerrstr_32[] = {'d','c','l',' ','n','o','t',' ','a','l','l','o','w','e','d','\0'};
-static moo_ooch_t synerrstr_33[] = {'w','r','o','n','g',' ','m','e','t','h','o','d',' ','n','a','m','e','\0'};
-static moo_ooch_t synerrstr_34[] = {'d','u','p','l','i','c','a','t','e',' ','m','e','t','h','o','d',' ','n','a','m','e','\0'};
-static moo_ooch_t synerrstr_35[] = {'d','u','p','l','i','c','a','t','e',' ','a','r','g','u','m','e','n','t',' ','n','a','m','e','\0'};
-static moo_ooch_t synerrstr_36[] = {'d','u','p','l','i','c','a','t','e',' ','t','e','m','p','o','r','a','r','y',' ','v','a','r','i','a','b','l','e',' ','n','a','m','e','\0'};
-static moo_ooch_t synerrstr_37[] = {'d','u','p','l','i','c','a','t','e',' ','v','a','r','i','a','b','l','e',' ','n','a','m','e','\0'};
-static moo_ooch_t synerrstr_38[] = {'d','u','p','l','i','c','a','t','e',' ','b','l','o','c','k',' ','a','r','g','u','m','e','n','t',' ','n','a','m','e','\0'};
-static moo_ooch_t synerrstr_39[] = {'u','n','d','e','c','l','a','r','e','d',' ','v','a','r','i','a','b','l','e','\0'};
-static moo_ooch_t synerrstr_40[] = {'u','n','u','s','a','b','l','e',' ','v','a','r','i','a','b','l','e',' ','i','n',' ','c','o','m','p','i','l','e','d',' ','c','o','d','e','\0'};
-static moo_ooch_t synerrstr_41[] = {'i','n','a','c','c','e','s','s','i','b','l','e',' ','v','a','r','i','a','b','l','e','\0'};
-static moo_ooch_t synerrstr_42[] = {'a','m','b','i','g','u','o','u','s',' ','v','a','r','i','a','b','l','e','\0'};
-static moo_ooch_t synerrstr_43[] = {'w','r','o','n','g',' ','e','x','p','r','e','s','s','i','o','n',' ','p','r','i','m','a','r','y','\0'};
-static moo_ooch_t synerrstr_44[] = {'t','o','o',' ','m','a','n','y',' ','t','e','m','p','o','r','a','r','i','e','s','\0'};
-static moo_ooch_t synerrstr_45[] = {'t','o','o',' ','m','a','n','y',' ','a','r','g','u','m','e','n','t','s','\0'};
-static moo_ooch_t synerrstr_46[] = {'t','o','o',' ','m','a','n','y',' ','b','l','o','c','k',' ','t','e','m','p','o','r','a','r','i','e','s','\0'};
-static moo_ooch_t synerrstr_47[] = {'t','o','o',' ','m','a','n','y',' ','b','l','o','c','k',' ','a','r','g','u','m','e','n','t','s','\0'};
-static moo_ooch_t synerrstr_48[] = {'t','o','o',' ','l','a','r','g','e',' ','b','l','o','c','k','\0'};
-static moo_ooch_t synerrstr_49[] = {'t','o','o',' ','l','a','r','g','e',' ','a','r','r','a','y',' ','e','x','p','r','e','s','s','i','o','n','\0'};
-static moo_ooch_t synerrstr_50[] = {'w','r','o','n','g',' ','p','r','i','m','i','t','i','v','e',' ','f','u','n','c','t','i','o','n',' ','n','u','m','b','e','r','\0'};
-static moo_ooch_t synerrstr_51[] = {'w','r','o','n','g',' ','p','r','i','m','i','t','i','v','e',' ','f','u','n','c','t','i','o','n',' ','i','d','e','n','t','i','f','i','e','r','\0'};
-static moo_ooch_t synerrstr_52[] = {'w','r','o','n','g',' ','m','o','d','u','l','e',' ','n','a','m','e','\0'};
-static moo_ooch_t synerrstr_53[] = {'#','i','n','c','l','u','d','e',' ','e','r','r','o','r','\0'};
-static moo_ooch_t synerrstr_54[] = {'w','r','o','n','g',' ','n','a','m','e','s','p','a','c','e',' ','n','a','m','e','\0'};
-static moo_ooch_t synerrstr_55[] = {'w','r','o','n','g',' ','p','o','o','l',' ','d','i','c','t','i','o','n','a','r','y',' ','n','a','m','e','\0'};
-static moo_ooch_t synerrstr_56[] = {'d','u','p','l','i','c','a','t','e',' ','p','o','o','l',' ','d','i','c','t','i','o','n','a','r','y',' ','n','a','m','e','\0'};
-static moo_ooch_t synerrstr_57[] = {'l','i','t','e','r','a','l',' ','e','x','p','e','c','t','e','d','\0'};
-static moo_ooch_t synerrstr_58[] = {'b','r','e','a','k',' ','o','r',' ','c','o','n','t','i','n','u','e',' ','n','o','t',' ','w','i','t','h','i','n',' ','a',' ','l','o','o','p','\0'};
-static moo_ooch_t synerrstr_59[] = {'b','r','e','a','k',' ','o','r',' ','c','o','n','t','i','n','u','e',' ','w','i','t','h','i','n',' ','a',' ','b','l','o','c','k','\0'};
-static moo_ooch_t synerrstr_60[] = {'w','h','i','l','e',' ','e','x','p','e','c','t','e','d','\0'};
-static moo_ooch_t synerrstr_61[] = {'m','i','s','s','i','n','g',' ','a','s','s','o','c','i','a','t','i','o','n',' ','k','e','y','\0'};
-static moo_ooch_t synerrstr_62[] = {'m','i','s','s','i','n','g',' ','a','s','s','o','c','i','a','t','i','o','n',' ','v','a','l','u','e','\0'};
-static moo_ooch_t synerrstr_63[] = {'m','i','s','s','i','n','g',' ','a','s','s','o','c','i','a','t','i','o','n','\0'};
+static moo_ooch_t synerrstr_33[] = {'#','n','a','t','i','v','e',' ','n','o','t',' ','a','l','l','o','w','e','d','\0'};
+static moo_ooch_t synerrstr_34[] = {'w','r','o','n','g',' ','m','e','t','h','o','d',' ','n','a','m','e','\0'};
+static moo_ooch_t synerrstr_35[] = {'d','u','p','l','i','c','a','t','e',' ','m','e','t','h','o','d',' ','n','a','m','e','\0'};
+static moo_ooch_t synerrstr_36[] = {'d','u','p','l','i','c','a','t','e',' ','a','r','g','u','m','e','n','t',' ','n','a','m','e','\0'};
+static moo_ooch_t synerrstr_37[] = {'d','u','p','l','i','c','a','t','e',' ','t','e','m','p','o','r','a','r','y',' ','v','a','r','i','a','b','l','e',' ','n','a','m','e','\0'};
+static moo_ooch_t synerrstr_38[] = {'d','u','p','l','i','c','a','t','e',' ','v','a','r','i','a','b','l','e',' ','n','a','m','e','\0'};
+static moo_ooch_t synerrstr_39[] = {'d','u','p','l','i','c','a','t','e',' ','b','l','o','c','k',' ','a','r','g','u','m','e','n','t',' ','n','a','m','e','\0'};
+static moo_ooch_t synerrstr_40[] = {'u','n','d','e','c','l','a','r','e','d',' ','v','a','r','i','a','b','l','e','\0'};
+static moo_ooch_t synerrstr_41[] = {'u','n','u','s','a','b','l','e',' ','v','a','r','i','a','b','l','e',' ','i','n',' ','c','o','m','p','i','l','e','d',' ','c','o','d','e','\0'};
+static moo_ooch_t synerrstr_42[] = {'i','n','a','c','c','e','s','s','i','b','l','e',' ','v','a','r','i','a','b','l','e','\0'};
+static moo_ooch_t synerrstr_43[] = {'a','m','b','i','g','u','o','u','s',' ','v','a','r','i','a','b','l','e','\0'};
+static moo_ooch_t synerrstr_44[] = {'w','r','o','n','g',' ','e','x','p','r','e','s','s','i','o','n',' ','p','r','i','m','a','r','y','\0'};
+static moo_ooch_t synerrstr_45[] = {'t','o','o',' ','m','a','n','y',' ','t','e','m','p','o','r','a','r','i','e','s','\0'};
+static moo_ooch_t synerrstr_46[] = {'t','o','o',' ','m','a','n','y',' ','a','r','g','u','m','e','n','t','s','\0'};
+static moo_ooch_t synerrstr_47[] = {'t','o','o',' ','m','a','n','y',' ','b','l','o','c','k',' ','t','e','m','p','o','r','a','r','i','e','s','\0'};
+static moo_ooch_t synerrstr_48[] = {'t','o','o',' ','m','a','n','y',' ','b','l','o','c','k',' ','a','r','g','u','m','e','n','t','s','\0'};
+static moo_ooch_t synerrstr_49[] = {'t','o','o',' ','l','a','r','g','e',' ','b','l','o','c','k','\0'};
+static moo_ooch_t synerrstr_50[] = {'t','o','o',' ','l','a','r','g','e',' ','a','r','r','a','y',' ','e','x','p','r','e','s','s','i','o','n','\0'};
+static moo_ooch_t synerrstr_51[] = {'w','r','o','n','g',' ','p','r','i','m','i','t','i','v','e',' ','f','u','n','c','t','i','o','n',' ','n','u','m','b','e','r','\0'};
+static moo_ooch_t synerrstr_52[] = {'w','r','o','n','g',' ','p','r','i','m','i','t','i','v','e',' ','f','u','n','c','t','i','o','n',' ','i','d','e','n','t','i','f','i','e','r','\0'};
+static moo_ooch_t synerrstr_53[] = {'w','r','o','n','g',' ','m','o','d','u','l','e',' ','n','a','m','e','\0'};
+static moo_ooch_t synerrstr_54[] = {'#','i','n','c','l','u','d','e',' ','e','r','r','o','r','\0'};
+static moo_ooch_t synerrstr_55[] = {'w','r','o','n','g',' ','n','a','m','e','s','p','a','c','e',' ','n','a','m','e','\0'};
+static moo_ooch_t synerrstr_56[] = {'w','r','o','n','g',' ','p','o','o','l',' ','d','i','c','t','i','o','n','a','r','y',' ','n','a','m','e','\0'};
+static moo_ooch_t synerrstr_57[] = {'d','u','p','l','i','c','a','t','e',' ','p','o','o','l',' ','d','i','c','t','i','o','n','a','r','y',' ','n','a','m','e','\0'};
+static moo_ooch_t synerrstr_58[] = {'l','i','t','e','r','a','l',' ','e','x','p','e','c','t','e','d','\0'};
+static moo_ooch_t synerrstr_59[] = {'b','r','e','a','k',' ','o','r',' ','c','o','n','t','i','n','u','e',' ','n','o','t',' ','w','i','t','h','i','n',' ','a',' ','l','o','o','p','\0'};
+static moo_ooch_t synerrstr_60[] = {'b','r','e','a','k',' ','o','r',' ','c','o','n','t','i','n','u','e',' ','w','i','t','h','i','n',' ','a',' ','b','l','o','c','k','\0'};
+static moo_ooch_t synerrstr_61[] = {'w','h','i','l','e',' ','e','x','p','e','c','t','e','d','\0'};
+static moo_ooch_t synerrstr_62[] = {'m','i','s','s','i','n','g',' ','a','s','s','o','c','i','a','t','i','o','n',' ','k','e','y','\0'};
+static moo_ooch_t synerrstr_63[] = {'m','i','s','s','i','n','g',' ','a','s','s','o','c','i','a','t','i','o','n',' ','v','a','l','u','e','\0'};
+static moo_ooch_t synerrstr_64[] = {'m','i','s','s','i','n','g',' ','a','s','s','o','c','i','a','t','i','o','n','\0'};
 static moo_ooch_t* synerrstr[] =
 {
 	synerrstr_0, synerrstr_1, synerrstr_2, synerrstr_3, synerrstr_4, synerrstr_5, synerrstr_6, synerrstr_7,
@@ -141,8 +142,10 @@ static moo_ooch_t* synerrstr[] =
 	synerrstr_32, synerrstr_33, synerrstr_34, synerrstr_35, synerrstr_36, synerrstr_37, synerrstr_38, synerrstr_39,
 	synerrstr_40, synerrstr_41, synerrstr_42, synerrstr_43, synerrstr_44, synerrstr_45, synerrstr_46, synerrstr_47,
 	synerrstr_48, synerrstr_49, synerrstr_50, synerrstr_51, synerrstr_52, synerrstr_53, synerrstr_54, synerrstr_55,
-	synerrstr_56, synerrstr_57, synerrstr_58, synerrstr_59, synerrstr_60, synerrstr_61, synerrstr_62, synerrstr_63
+	synerrstr_56, synerrstr_57, synerrstr_58, synerrstr_59, synerrstr_60, synerrstr_61, synerrstr_62, synerrstr_63,
+	synerrstr_64 
 };
+
 #endif
 /* END: GENERATED WITH generr.st */
 
diff --git a/moo/lib/moo-utl.h b/moo/lib/moo-utl.h
index a4acda5..04cb378 100644
--- a/moo/lib/moo-utl.h
+++ b/moo/lib/moo-utl.h
@@ -41,12 +41,12 @@ MOO_EXPORT moo_oow_t moo_hashbytes (
 #if defined(MOO_HAVE_INLINE)
 	static MOO_INLINE moo_oow_t moo_hashbchars (const moo_bch_t* ptr, moo_oow_t len)
 	{
-		return moo_hashbytes((const moo_oob_t*)ptr,len * MOO_SIZEOF(moo_bch_t));
+		return moo_hashbytes((const moo_oob_t*)ptr, len * MOO_SIZEOF(moo_bch_t));
 	}
 
 	static MOO_INLINE moo_oow_t moo_hashuchars (const moo_uch_t* ptr, moo_oow_t len)
 	{
-		return moo_hashbytes((const moo_oob_t*)ptr,len * MOO_SIZEOF(moo_uch_t));
+		return moo_hashbytes((const moo_oob_t*)ptr, len * MOO_SIZEOF(moo_uch_t));
 	}
 
 	static MOO_INLINE moo_oow_t moo_hashwords (const moo_oow_t* ptr, moo_oow_t len)
@@ -59,8 +59,8 @@ MOO_EXPORT moo_oow_t moo_hashbytes (
 		return moo_hashbytes((const moo_oob_t*)ptr, len * MOO_SIZEOF(moo_oohw_t));
 	}
 #else
-#	define moo_hashbchars(ptr,len)    moo_hashbytes((const moo_oob_t*)ptr,len * MOO_SIZEOF(moo_bch_t))
-#	define moo_hashuchars(ptr,len)    moo_hashbytes((const moo_oob_t*)ptr,len * MOO_SIZEOF(moo_uch_t))
+#	define moo_hashbchars(ptr,len)    moo_hashbytes((const moo_oob_t*)ptr, len * MOO_SIZEOF(moo_bch_t))
+#	define moo_hashuchars(ptr,len)    moo_hashbytes((const moo_oob_t*)ptr, len * MOO_SIZEOF(moo_uch_t))
 #	define moo_hashwords(ptr,len)     moo_hashbytes((const moo_oob_t*)ptr, len * MOO_SIZEOF(moo_oow_t))
 #	define moo_hashhalfwords(ptr,len) moo_hashbytes((const moo_oob_t*)ptr, len * MOO_SIZEOF(moo_oohw_t))
 #endif
diff --git a/moo/lib/moo.h b/moo/lib/moo.h
index 10f0a31..36270a6 100644
--- a/moo/lib/moo.h
+++ b/moo/lib/moo.h
@@ -1207,6 +1207,7 @@ enum moo_synerrnum_t
 	MOO_SYNERR_CLASSNAME,     /* wrong class name */
 	MOO_SYNERR_CLASSTRSIZE,   /* non-pointer class inheriting a superclass with trailer size set */
 	MOO_SYNERR_DCLBANNED,     /* #dcl not allowed */
+	MOO_SYNERR_NATIVEBANNED,  /* #native not allowed */
 	MOO_SYNERR_MTHNAME,       /* wrong method name */
 	MOO_SYNERR_MTHNAMEDUP,    /* duplicate method name */
 	MOO_SYNERR_ARGNAMEDUP,    /* duplicate argument name */
diff --git a/moo/mod/x11.c b/moo/mod/x11.c
index f4ab680..7bd73bf 100644
--- a/moo/mod/x11.c
+++ b/moo/mod/x11.c
@@ -47,7 +47,6 @@ typedef struct x11_win_t x11_win_t;
 struct x11_win_t
 {
 	xcb_window_t w;
-	
 };
 
 /* ------------------------------------------------------------------------ */
@@ -265,7 +264,8 @@ static moo_pfinfo_t x11_pfinfo[] =
 static int x11_import (moo_t* moo, moo_mod_t* mod, moo_oop_class_t _class)
 {
 	if (moo_setclasstrsize(moo, _class, MOO_SIZEOF(x11_t)) <= -1) return -1;
-	return moo_genpfmethods(moo, mod, _class, x11_pfinfo, MOO_COUNTOF(x11_pfinfo));
+	/*return moo_genpfmethods(moo, mod, _class, x11_pfinfo, MOO_COUNTOF(x11_pfinfo));*/
+	return 0;
 }
 
 static moo_pfimpl_t x11_query (moo_t* moo, moo_mod_t* mod, const moo_ooch_t* name)