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@@ -12,6 +12,11 @@ What's New in Python 2.6.1 alpha 1
Core and Builtins
-----------------
+- Issue #4069: When set.remove(element) is used with a set element, the element
+ is temporarily replaced with an equivalent frozenset. But the eventual
+ KeyError would always report the empty frozenset([]) as the missing key. Now
+ it correctly refers to the initial element.
+
- Fixed C99 style comments in several files. Python is now C89 compatible
again.