Both patches look good to me.

On 12/6/16 5:13 PM, Jun Wu wrote:
> # HG changeset patch
> # User Jun Wu <qu...@fb.com>
> # Date 1481043999 0
> #      Tue Dec 06 17:06:39 2016 +0000
> # Node ID 5197933cb8b90a976be3d298b5f51b154fd8e733
> # Parent  67bcd43e64ca03f486a817fccf38e83020b06793
> # Available At https://bitbucket.org/quark-zju/hg-draft
> #              hg pull https://bitbucket.org/quark-zju/hg-draft -r 
> 5197933cb8b9
> localrepo: use ProgrammingError
>
> This is an example usage of ProgrammingError. Let's start migrating
> RuntimeError to ProgrammingError.
>
> The code only runs when devel.all-warnings or devel.check-locks is set, so
> it does not affect the end-user experience.
>
> diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
> --- a/mercurial/localrepo.py
> +++ b/mercurial/localrepo.py
> @@ -1017,6 +1017,5 @@ class localrepository(object):
>                   or self.ui.configbool('devel', 'check-locks')):
>               if self._currentlock(self._lockref) is None:
> -                raise RuntimeError('programming error: transaction requires '
> -                                   'locking')
> +                raise error.ProgrammingError('transaction requires locking')
>           tr = self.currenttransaction()
>           if tr is not None:
> diff --git a/tests/test-devel-warnings.t b/tests/test-devel-warnings.t
> --- a/tests/test-devel-warnings.t
> +++ b/tests/test-devel-warnings.t
> @@ -175,5 +175,5 @@ Test programming error failure:
>     ** Extensions loaded: * (glob)
>     Traceback (most recent call last):
> -  RuntimeError: programming error: transaction requires locking
> +  mercurial.error.ProgrammingError: transaction requires locking
>   
>     $ cd ..
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