first steps to deprecate 'nil' statement

todo.txt

@@ -6,9 +6,6 @@ version 0.9.0
 
 - make 'bind' default for templates and introduce 'mixin'
 
-- implement "closure tuple consists of a single 'ref'" optimization
-- implement for loop transformation for first class iterators
-
 - implicit deref for parameter matching
 - optimize genericAssign in the code generator
 - the lookup rules for generics really are too permissive; global scope only
@@ -43,6 +40,8 @@ version 0.9.XX
     echo a
     echo b)
 
+- implement "closure tuple consists of a single 'ref'" optimization
+- implement for loop transformation for first class iterators
 - JS gen:
   - fix exception handling
 - object branch transitions can't work with the current 'reset'; add a 'reset'
@@ -60,7 +59,8 @@ version 0.9.XX
   a full blown statement; a ``try`` expression might be a good idea to make
   error handling more light-weight
 - ``=`` should be overloadable; requires specialization for ``=``
-- ``hoist`` pragma for loop hoisting
+- ``hoist`` pragma for loop hoisting: can be easily done with 
+  AST overloading + global
 - document destructors; don't work yet when used as expression
 - make use of ``tyIter`` to fix the implicit items/pairs issue
 - better support for macros that rewrite procs