# HG changeset patch
# User Matt Harbison <matt_harbison@yahoo.com>
# Date 2019-12-27 23:51:45
# Node ID e3ce3731d621dcd3799c65cae89f3d597a43bee3
# Parent  37458d8b0c1e826d318f7aab314d5966533be73f

ui: delete local variables instead of setting to `None`

The previous code was flagged by PyCharm as an unused variable assignment.

Differential Revision: https://phab.mercurial-scm.org/D7759

diff --git a/mercurial/ui.py b/mercurial/ui.py
--- a/mercurial/ui.py
+++ b/mercurial/ui.py
@@ -2032,7 +2032,10 @@ class ui(object):
             self.log(
                 b'develwarn', b'%s at: %s:%d (%s)\n', msg, fname, lineno, fmsg
             )
-            curframe = calframe = None  # avoid cycles
+
+            # avoid cycles
+            del curframe
+            del calframe
 
     def deprecwarn(self, msg, version, stacklevel=2):
         """issue a deprecation warning