# HG changeset patch
# User Anton Shestakov <av6@dwimlabs.net>
# Date 1644592251 -10800
# Node ID ce7da767c7f66b90d4f2e2dfa5d9b1fd98fda67f
# Parent  7da0f8128d90d5a9b40a869f42cf13be50e9bd44
evolve: make _computeobsoleteset() return a frozenset

Let's make sure that obsolete.getrevs(repo, b'obsolete') returns a frozenset to
be compatible with Mercurial 6.1. This shouldn't produce any issues on older
versions, because I doubt anything tries to modify a set of obsolete revisions
by calling .add() or .remove() directly on it.

See 27fe84a8dd60 and c7e675848027 in core.

diff -r 7da0f8128d90 -r ce7da767c7f6 hgext3rd/evolve/obscache.py
--- a/hgext3rd/evolve/obscache.py	Fri Feb 18 11:55:40 2022 +0100
+++ b/hgext3rd/evolve/obscache.py	Fri Feb 11 18:10:51 2022 +0300
@@ -432,7 +432,6 @@
 
 def _computeobsoleteset(orig, repo):
     """the set of obsolete revisions"""
-    obs = set()
     repo = repo.unfiltered()
     notpublic = repo._phasecache.getrevset(repo, (phases.draft, phases.secret))
     if notpublic:
@@ -461,10 +460,7 @@
                 # disk when the transaction close.
                 obscache.update(repo)
         isobs = obscache.get
-    for r in notpublic:
-        if isobs(r):
-            obs.add(r)
-    return obs
+    return frozenset(r for r in notpublic if isobs(r))
 
 @eh.uisetup
 def cachefuncs(ui):