Fixes the errors with use of asyncio in docrepr/tests/test_output.py:
     
>       await compare_screenshots(test_id, url)
E       TypeError: 'coroutine' object is not callable

--- a/conftest.py
+++ b/conftest.py
@@ -65,7 +65,7 @@ def _open_browser(url):
 
 
 @pytest.fixture
-async def compare_screenshots(request):
+def compare_screenshots(request):
     """Run visual regression test on the output."""
     async def _compare_screenshots(test_id, url):
         if (request.config.getoption(COMPARE_SCREENSHOTS_OPTION) or
ref='/'>index</a> : <a href='/guix/'>guix</a></td><td class='form'><form method='get'>
<input type='hidden' name='id' value='881f9630c99e1aeeb7d539a58ac8fff4bf7a12a7'/><select name='h' onchange='this.form.submit();'>
<option value='koszko' selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=881f9630c99e1aeeb7d539a58ac8fff4bf7a12a7'>refs</a><a class='active' href='/guix/log/tests/guix-pack-localstatedir.sh'>log</a><a href='/guix/tree/tests/guix-pack-localstatedir.sh?id=881f9630c99e1aeeb7d539a58ac8fff4bf7a12a7'>tree</a><a href='/guix/commit/tests/guix-pack-localstatedir.sh?id=881f9630c99e1aeeb7d539a58ac8fff4bf7a12a7'>commit</a><a href='/guix/diff/tests/guix-pack-localstatedir.sh?id=881f9630c99e1aeeb7d539a58ac8fff4bf7a12a7'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/guix-pack-localstatedir.sh'>
<input type='hidden' name='id' value='881f9630c99e1aeeb7d539a58ac8fff4bf7a12a7'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=881f9630c99e1aeeb7d539a58ac8fff4bf7a12a7'>root</a>/<a href='/guix/log/tests?id=881f9630c99e1aeeb7d539a58ac8fff4bf7a12a7'>tests</a>/<a href='/guix/log/tests/guix-pack-localstatedir.sh?id=881f9630c99e1aeeb7d539a58ac8fff4bf7a12a7'>guix-pack-localstatedir.sh</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/guix-pack-localstatedir.sh?id=881f9630c99e1aeeb7d539a58ac8fff4bf7a12a7&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-05-18 12:23:31 +0200'>2019-05-18</span></td><td><a href='/guix/commit/tests/guix-pack-localstatedir.sh?id=baab87ac49e3f0f873e17eb16db9781189b1f2d1'>pack: '--localstatedir' and '-R' tests gracefully handle missing /gnu/store.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/35776&gt;.
Reported by Ting-Wei Lan &lt;lantw44@gmail.com&gt;.

* tests/guix-pack-localstatedir.sh: Set 'storedir' before
'NIX_STORE_DIR'.
* tests/guix-pack-relocatable.sh: Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-11-23 15:42:01 +0100'>2018-11-23</span></td><td><a href='/guix/commit/tests/guix-pack-localstatedir.sh?id=08f410834bffbe1e55633a0a4c87caba69d7fa92'>pack: Add '--profile-name'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/scripts/pack.scm (self-contained-tarball): Add #:profile-name and
honor it.
(squashfs-image, docker-image): Add #:profile-name.
(%default-options): Add 'profile-name'.
(%options, show-help): Add "--profile-name".
(guix-pack): Honor it.
* tests/guix-pack-localstatedir.sh: New file.
* Makefile.am (SH_TESTS): Add it.
* doc/guix.texi (Invoking guix pack): Document "--profile-name".
</span></span></td><td>Ludovic Courtès</td></tr>