bugfix: nil -> emptyNode

compiler/rodread.nim

@@ -123,7 +123,7 @@ type
   PRodReader* = ref TRodReader
 
 const 
-  FileVersion* = "1018"       # modify this if the rod-format changes!
+  FileVersion* = "1019"       # modify this if the rod-format changes!
 
 var rodCompilerprocs*: TStrTable
 

compiler/rodwrite.nim

@@ -286,7 +286,7 @@ proc encodeSym(w: PRodWriter, s: PSym, result: var string) =
     if not astNeeded(s):
       codeAst = s.ast.sons[codePos]
       # ugly hack to not store the AST:
-      s.ast.sons[codePos] = nil
+      s.ast.sons[codePos] = ast.emptyNode
     encodeNode(w, s.info, s.ast, result)
     if codeAst != nil:
       # resore the AST:

examples/hallo.nim

@@ -1,3 +1,3 @@
 # Hello world program
 
-echo "Hello world!"
+echo "Hello World!"

todo.txt

@@ -21,6 +21,7 @@ incremental compilation
   - test thread var
   - test method generation
   - test DLL interfacing!
+  - hallo.rod is missing initial statements: feature or bug?
 - fix remaining bugs
 - write documentation
 - make the compiler output a warning if linking fails with --symbolFiles:on