#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/Python/opcode_targets.h b/Python/opcode_targets.h
index 8b59c2d..a91da79 100644
--- a/Python/opcode_targets.h
+++ b/Python/opcode_targets.h
@@ -137,7 +137,7 @@
&&TARGET_LOAD_CLOSURE,
&&TARGET_LOAD_DEREF,
&&TARGET_STORE_DEREF,
- &&_unknown_opcode,
+ &&TARGET_DELETE_DEREF,
&&_unknown_opcode,
&&TARGET_CALL_FUNCTION_VAR,
&&TARGET_CALL_FUNCTION_KW,