# HG changeset patch
# User Jun Wu <quark@fb.com>
# Date 2016-08-10 14:05:20
# 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 --git a/mercurial/ui.py b/mercurial/ui.py
--- a/mercurial/ui.py
+++ b/mercurial/ui.py
@@ -1175,6 +1175,7 @@ class ui(object):
                            % ((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