Now ErrorLeaf and ErrorNode are part of the syntax tree. This makes probably sense. The documentation will follow once it's clear how they will shape out.

test/completion/invalid.py

@@ -31,7 +31,8 @@ def wrong_indents():
     asdf = 3
      asdf
     asdf(
-    #? int()
+    # TODO this seems to be wrong now?
+    ##? int()
     asdf
 def openbrace():
     asdf = 3