small code cleanups

compiler/ast.nim

@@ -287,7 +287,6 @@ const
 
   sfNoRoot* = sfBorrow # a local variable is provably no root so it doesn't
                        # require RC ops
-  sfClosureCreated* = sfDiscriminant # for transf-lambdalifting interaction
 
 const
   # getting ready for the future expr/stmt merge

compiler/lambdalifting.nim

@@ -422,7 +422,6 @@ proc transformOuterConv(n: PNode): PNode =
 proc makeClosure(prc, env: PSym, info: TLineInfo): PNode =
   result = newNodeIT(nkClosure, info, prc.typ)
   result.add(newSymNode(prc))
-  if prc.kind == skIterator: incl(prc.flags, sfClosureCreated)
   if env == nil:
     result.add(newNodeIT(nkNilLit, info, getSysType(tyNil)))
   else:
@@ -776,7 +775,6 @@ proc liftIterSym*(n: PNode): PNode =
   # transforms  (iter)  to  (let env = newClosure[iter](); (iter, env)) 
   let iter = n.sym
   assert iter.kind == skIterator
-  #if sfClosureCreated in iter.flags: return n
 
   result = newNodeIT(nkStmtListExpr, n.info, n.typ)
   

web/news.txt

@@ -74,6 +74,8 @@ Language Additions
   evaluable at compile-time.
 - Support for user-defined type classes has been added.
 - The *command syntax* is supported in a lot more contexts.
+- Anonymous iterators are now supported and iterators can capture variables
+  of an outer proc.
 
 
 Tools improvements