tables work in 'const' sections; echo supports 'nil' strings; minor cleanups

web/news.txt

@@ -32,6 +32,15 @@ News
   - Automatic dereferencing is now done for the first argument of a routine
     call if overloading resolution produces no match otherwise. This feature
     has to be enabled with the `experimental`_ pragma.
+  - Objects that do not use inheritance nor ``case`` can be put into ``const``
+    sections. This means that finally this is possible and produces rather
+    nice code:
+
+  .. code-block:: nim
+    import tables
+
+    const
+      foo = {"ah": "finally", "this": "is", "possible.": "nice!"}.toTable()
 
 
 2014-12-29 Version 0.10.2 released