prepare for upcoming parsing change of unary operators

lib/pure/collections/tables.nim

@@ -192,7 +192,7 @@ proc `[]`*[A, B](t: Table[A, B], key: A): B =
 
 proc mget*[A, B](t: var Table[A, B], key: A): var B =
   ## retrieves the value at ``t[key]``. The value can be modified.
-  ## If `key` is not in `t`, the ``EInvalidKey`` exception is raised.
+  ## If `key` is not in `t`, the ``KeyError`` exception is raised.
   var hc: THash
   var index = rawGet(t, key, hc)
   if index >= 0: result = t.data[index].val

todo.txt

@@ -1,16 +1,16 @@
 version 0.10.4
 ==============
 
+- improve the parser; deal with  echo $foo  gotcha
 - improve GC-unsafety warnings
 - make 'nil' work for 'add' and 'len'
-- disallow negative indexing
-- improve the parser; deal with  echo $foo  gotcha
 - add "all threads are blocked" detection to 'spawn'
 
 
 version 1.0
 ===========
 
+- disallow negative indexing
 - figure out why C++ bootstrapping is so much slower
 - nimsuggest: auto-completion needs to work in 'class' macros
 - improve the docs for inheritance