Make PeachPy processes deterministic:

  https://github.com/Maratyszcza/PeachPy/issues/88
  https://issues.guix.gnu.org/50672

diff --git a/peachpy/name.py b/peachpy/name.py
index b6a03dc..412079d 100644
--- a/peachpy/name.py
+++ b/peachpy/name.py
@@ -86,13 +86,13 @@ def add_scoped_name(self, scoped_name):
                 self.names[scope_name.name] = scope
         else:
             assert scope_name.name is None
-            self.prenames.setdefault(scope_name.prename, set())
+            self.prenames.setdefault(scope_name.prename, {})
             if subscoped_name:
                 for subscope in iter(self.prenames[scope_name.prename]):
                     if isinstance(subscope, Namespace) and subscope.scope_name is scope_name:
                         subscope.add_scoped_name(subscoped_name)
                         return
-            self.prenames[scope_name.prename].add(scope)
+            self.prenames[scope_name.prename][scope] = None
 
     def assign_names(self):
         # Step 1: assign names to symbols with prenames with no conflicts
ix/'>summary</a><a href='/guix/refs/?id=823567803f5afd9edf663b29b4e62ac0581cbfec'>refs</a><a class='active' href='/guix/log/gnu/tests/linux-modules.scm'>log</a><a href='/guix/tree/gnu/tests/linux-modules.scm?id=823567803f5afd9edf663b29b4e62ac0581cbfec'>tree</a><a href='/guix/commit/gnu/tests/linux-modules.scm?id=823567803f5afd9edf663b29b4e62ac0581cbfec'>commit</a><a href='/guix/diff/gnu/tests/linux-modules.scm?id=823567803f5afd9edf663b29b4e62ac0581cbfec'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/tests/linux-modules.scm'>
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<tr><td><span title='2020-04-22 22:59:39 +0200'>2020-04-22</span></td><td><a href='/guix/commit/gnu/tests/linux-modules.scm?id=f91ad0b13d8d3d5b1ae92e209b1be6e8473385ba'>system: Automatically adjust linux-module packages to use the</a><span class='msg-avail'>...<span class='msg-tooltip'>operating-system's kernel.

* gnu/system.scm (package-for-kernel): New procedure.
(operating-system-directory-base-entries): Use it.
* gnu/tests/linux-module.scm: Test it.
</span></span></td><td>Danny Milosavljevic</td></tr>
<tr><td><span title='2020-04-05 13:07:13 +0200'>2020-04-05</span></td><td><a href='/guix/commit/gnu/tests/linux-modules.scm?id=044d1478c9a63a64547c9cc320008f8d8fbf6791'>gnu: Add kernel-module-loader-service.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/guix.texi (Linux Services): Add a new subsection and document the
new service and its configuration.
* gnu/services/linux.scm (kernel-module-loader-service-type): New type.
(kernel-module-loader-shepherd-service): New procedure.
* gnu/tests/linux-modules.scm (module-loader-program): Procedure
removed.
(modules-loaded?-program): New procedure.
(run-loadable-kernel-modules-test): 'module-loader-program' procedure
replaced by the new one.
[os]: Use 'kernel-module-loader-service'.

Signed-off-by: Danny Milosavljevic &lt;dannym@scratchpost.org&gt;
</span></span></td><td>Brice Waegeneire</td></tr>
<tr><td><span title='2020-03-22 12:51:50 +0100'>2020-03-22</span></td><td><a href='/guix/commit/gnu/tests/linux-modules.scm?id=5c79f238634c5adb6657f1b4b1bb4ddb8bb73ef1'>system: Add kernel-loadable-modules to operating-system.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system.scm (&lt;operating-system&gt;): Add kernel-loadable-modules.
(operating-system-directory-base-entries): Use it.
* doc/guix.texi (operating-system Reference): Document
KERNEL-LOADABLE-MODULES.
* gnu/build/linux-modules.scm (depmod): New procedure.
(make-linux-module-directory): New procedure.  Export it.
* guix/profiles.scm (linux-module-database): New procedure.  Export it.
* gnu/tests/linux-modules.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* gnu/packages/linux.scm (make-linux-libre*)[arguments]&lt;#:phases&gt;[install]:
Disable depmod.  Remove "build" and "source" symlinks.
[native-inputs]: Remove kmod.
</span></span></td><td>Danny Milosavljevic</td></tr>