Test coverage broken... since 1.9

[Matt Mackall]

On Thu, 2012-04-19 at 11:31 -0400, Greg Ward wrote:
> Hi folks --
> 
> I just discovered that run-tests.py's test coverage feature is broken
> in 2.2-rc. And 2.1, and 2.0, and 1.9. The last version where it worked
> is 1.8!

<hint>
If someone comes up with a fix for this before the release, I'll accept
it.
</hint>

> I bisected it back to:
> 
>   changeset:   13764:8ed67e44c71c
>   user:        Idan Kamara <idankk86 at gmail.com>
>   date:        2011-03-25 22:15:37 +0200
>   summary:     tests: set HOME to the test temp dir (issue2707)

I seem to recall running coverage slows down the test suite quite
substantially and we've never systematically used the data it produces.

-- 
Mathematics is the supreme nostalgia of our time.