Add news about changes to metaclasses and __bases__ error checking.

Add news about changes to metaclasses and bases error checking.
cca75403 · Jeremy Hylton · fa955697 · cca75403
Commit cca75403 authored Feb 27, 2007 by Jeremy Hylton
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+++ b/Misc/NEWS
@@ -126,6 +126,13 @@ Core and builtins

 - Bug #1664966: Fix crash in exec if Unicode filename can't be decoded.

+- Add new requirements for metaclasses.  1) If type or a subclass of type
+  occurs in __bases__, it must occur before any non-type bases, e.g.
+  before regular classes.  2) If you assign to __bases__, you may not
+  change the metaclass.  Many more illegal assignments to __bases__
+  are now checked and raise TypeErrors.  This changed fixed at least
+  one known crash.
+
 Library
 -------