# HG changeset patch
# User Jun Wu <quark@fb.com>
# Date 1470837920 -3600
# Node ID 96bd27eb23f0593ccd8671d945a2106844c6cdad
# Parent  39149b6036e6d08082907f174443f9cff18f988d
ui: drop values returned by inspect.*frame*() to avoid cycles

"f = inspect.currentframe()" instantly creates a cycle because
"f.f_locals['f']" is "f" itself.

This patch explicitly sets those frame objects to None to avoid cycles.

diff -r 39149b6036e6 -r 96bd27eb23f0 mercurial/ui.py
--- a/mercurial/ui.py	Tue Aug 09 16:45:28 2016 +0100
+++ b/mercurial/ui.py	Wed Aug 10 15:05:20 2016 +0100
@@ -1175,6 +1175,7 @@
                            % ((msg,) + calframe[stacklevel][1:4]))
             self.log('develwarn', '%s at: %s:%s (%s)\n',
                      msg, *calframe[stacklevel][1:4])
+            curframe = calframe = None  # avoid cycles
 
     def deprecwarn(self, msg, version):
         """issue a deprecation warning