[PATCH 2 of 3 various] context: make sure __str__ works, also when there is no _changectx

[Ryan McElroy]

On 4/13/2015 1:26 PM, Mads Kiilerich wrote:
> # HG changeset patch
> # User Mads Kiilerich <mads at kiilerich.com>
> # Date 1426800170 -3600
> #      Thu Mar 19 22:22:50 2015 +0100
> # Node ID 31a330fcad90837e0c0d858db69e67a7f74ec997
> # Parent  dec70e4b55cad0d4f1ef1ed0468e2710cb4d49db
> context: make sure __str__ works, also when there is no _changectx
>
> Before, it could crash when trying to print the wrong kind of object at the
> wrong time.
>
> diff --git a/mercurial/context.py b/mercurial/context.py
> --- a/mercurial/context.py
> +++ b/mercurial/context.py
> @@ -652,7 +652,10 @@ class basefilectx(object):
>               return False
>   
>       def __str__(self):
> -        return "%s@%s" % (self.path(), self._changectx)
> +        try:
> +            return "%s@%s" % (self.path(), self._changectx)
> +        except error.LookupError:
> +            return "%s@???" % self.path()
>   
>       def __repr__(self):
>           return "<%s %s>" % (type(self).__name__, str(self))
Can you add a test that demonstrates the issue?