On 12/18/2016 08:24 AM, Yuya Nishihara wrote:
On Fri, 16 Dec 2016 20:31:29 +0100, Pierre-Yves David wrote:
# HG changeset patch
# User Pierre-Yves David <pierre-yves.da...@ens-lyon.org>
# Date 1481545965 -3600
#      Mon Dec 12 13:32:45 2016 +0100
# Node ID f3479f74af0d2b21c89e906c503f4cddf4b3c39b
# Parent  182cacaa4c32330c0466b7111a75d060830783e8
registrar: raise a programming error on duplicated registering

Previous, registering different object with the same name would silently
overwrite the first value with the second one. We now detect the situation and
raise an error. No extension in test or core had the issues.

diff --git a/mercurial/registrar.py b/mercurial/registrar.py
--- a/mercurial/registrar.py
+++ b/mercurial/registrar.py
@@ -8,6 +8,7 @@
 from __future__ import absolute_import

 from . import (
+    error,
     pycompat,
     util,
 )
@@ -55,6 +56,9 @@ class _funcregistrarbase(object):
             func._origdoc = doc
             func.__doc__ = self._formatdoc(decl, doc)

+        if name in self._table:
+            raise error.ProgrammingError('duplicate registration for name %s',
+                                         name)

It should be '% name'.

I'm not sure? We usually have the offending entry at the end because it has variable length. What do you think?
(I made a minor change in the new version,
'duplicate registration for name: "%s"')


I slightly prefer raising the error before modifying the func object, but that
would make little difference since ProgrammingError isn't a recoverable error.

Ha!, very good catch. I pushed an updated version here, if you want to look at/take it.

https://www.mercurial-scm.org/repo/users/marmoute/mercurial/rev/b52e8a4f4c0f

         self._table[name] = func
         self._extrasetup(name, func, *args, **kwargs)

--
Pierre-Yves David
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