#4617: Previously it was illegal to delete a name from the local
namespace if it occurs as a free variable in a nested block. This limitation
of the compiler has been lifted, and a new opcode introduced (DELETE_DEREF).
This sample was valid in 2.6, but fails to compile in 3.x without this change::
>>> def f():
... def print_error():
... print(e)
... try:
... something
... except Exception as e:
... print_error()
... # implicit "del e" here
This sample has always been invalid in Python, and now works::
>>> def outer(x):
... def inner():
... return x
... inner()
... del x
There is no need to bump the PYC magic number: the new opcode is used
for code that did not compile before.
diff --git a/Misc/NEWS b/Misc/NEWS
index 6349b39..11a14f2 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,10 @@
Core and Builtins
-----------------
+- Issue #4617: Previously it was illegal to delete a name from the local
+ namespace if it occurs as a free variable in a nested block. This limitation
+ of the compiler has been lifted, and a new opcode introduced (DELETE_DEREF).
+
- Issue #9804: ascii() now always represents unicode surrogate pairs as
a single ``\UXXXXXXXX``, regardless of whether the character is printable
or not. Also, the "backslashreplace" error handler now joins surrogate