added moo_findmethodinclasschain()

added MOO_SYNERR_CLASSNCIFCE
finished implementing interface conformance check primitively

moo/kernel/Class.moo

@@ -1,8 +1,14 @@
+interface ClassInterface
+{
+	method name.
+	method superclass.
+}
+
 ##
 ## the Class object should be a variable-pointer object because
 ## it needs to accomodate class instance variables.
 ##
-class(#pointer,#limited) Class(Apex)
+class(#pointer,#limited) Class(Apex) [ClassInterface]
 {
 	var spec, selfspec, superclass, subclasses, name, modname.
 	var instvars, classinstvars, classvars, pooldics.

moo/kernel/X11.moo

@@ -3,7 +3,7 @@
 interface X11able
 {
 	method(#dual) abc.
-	method(#dual) def.
+	method(#dual,#liberal) def(x, y).
 }
 interface X11able2
 {
@@ -13,7 +13,7 @@ interface X11able2
 
 interface X11able3
 {
-	method(#dual) abc3.
+	method(#dual) class.
 }
 
 
@@ -33,8 +33,8 @@ class X11(Object) [X11able,selfns.X11able3] from 'x11'
 	var llevent_blocks.
 
 method(#dual) abc { ^nil }
-method(#dual) def { ^nil }
-method(#dual) abc3 { ^nil }
+method(#dual,#liberal) def(x, z) { ^nil }
+###method(#dual) abc3 { ^nil }
 
 	interface X11able3
 	{

moo/kernel/generr.moo

@@ -80,6 +80,7 @@ class MyObject(Object)
 			'duplicate name'
 			'undefined name'
 			'contradictory class definition'
+			'class not conforming to interface'
 			'invalid non-pointer instance size'
 			'prohibited inheritance'
 			'variable declaration not allowed'