--- a/.hgsigs	Thu Sep 10 17:44:34 2020 +0900
+++ b/.hgsigs	Fri Oct 02 07:56:01 2020 -0700
@@ -201,3 +201,4 @@
 28163c5de797e5416f9b588940f4608269b4d50a 0 iQJJBAABCgAzFiEE64UTlbQiPuL3ugso2lR0C/CHMroFAl8VylYVHDc4OTVwdWxraXRAZ21haWwuY29tAAoJENpUdAvwhzK6zUEQAJoLrpMmHvM4VYepsu2UTFI2VA1iL7cd+AOlcAokn/29JOqmAWD2ujUMv2FIdcNqAW/ayeEW9oLAi0dOfLqS6UAxfw8hYEiM6hV1R0W9DOUV5CRQ5T86cbaZFBrrJL9N87tHjro0eS3i8iwPpklnWrwf8fkcBq8SKFBZbubat8X/mejbbq6zYML9SEhtrKHyBPL5iQjzqDEGWyTqJYusHGVkAtFMZWxStDA3VSr3x9Iy0495XdegYRkUFytRsz1zB3vfawJsWRY7tQfff5CF6knZ+UIpetjgJIlm21/vQmcL1aTIxem0CFQt5bub1a+LYI1TWt59rFrnRj97K6Kq6xG6lPjnM3l/w2nehGfpL/Tfjih9gY8ToS1GRg2JJ4IiXAI57fv5fZcZv3R0xAGfWfRdwMsO2siaDrd4R/kraDlTPZZ1Qmpa+Y4XtFxSGIXtf9DWt/7pw81GWrUH0u/WYjfSpYvbdr7GvYpdzxMmtEULoxJ9ibyFDyDyqEkJfT6onFb1aaHQJ1mjho1x93uDeAEq0R5UCSNDxi31Hq/nWtA9IwCjYeQkv9D1rxFcSx3MetUpJofdBYvvFsvjNTM5GO2ETvsjyzXf2Qa3oobQoKBqbTuKR6yJlCsmWJuejbDbblBdx3mj4xpXxmX/YQHQ+2PYrfopel/8Am8j7sq0sNcV
 7fc3c5fbc65f6fe85d70ea63923b8767dda4f2e0 0 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
 f62bb5d07848ca598aa860a517394130b61bf2ee 0 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
+07731064ac41dacdf0ec869ebd05c2e848c14fbf 0 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

--- a/.hgtags	Thu Sep 10 17:44:34 2020 +0900
+++ b/.hgtags	Fri Oct 02 07:56:01 2020 -0700
@@ -214,3 +214,4 @@
 28163c5de797e5416f9b588940f4608269b4d50a 5.5rc0
 7fc3c5fbc65f6fe85d70ea63923b8767dda4f2e0 5.5
 f62bb5d07848ca598aa860a517394130b61bf2ee 5.5.1
+07731064ac41dacdf0ec869ebd05c2e848c14fbf 5.5.2

--- a/hgdemandimport/__init__.py	Thu Sep 10 17:44:34 2020 +0900
+++ b/hgdemandimport/__init__.py	Fri Oct 02 07:56:01 2020 -0700
@@ -52,6 +52,7 @@
     'rfc822',
     'mimetools',
     'sqlalchemy.events',  # has import-time side effects (issue5085)
+    'sqlalchemy.dialects',  # similar problems as above
     # setuptools 8 expects this module to explode early when not on windows
     'distutils.msvc9compiler',
     '__builtin__',

--- a/mercurial/repoview.py	Thu Sep 10 17:44:34 2020 +0900
+++ b/mercurial/repoview.py	Fri Oct 02 07:56:01 2020 -0700
@@ -70,8 +70,10 @@
 
     ms = mergestate.mergestate.read(repo)
     if ms.active():
-        pinned.add(ms.localctx.rev())
-        pinned.add(ms.otherctx.rev())
+        for node in (ms.local, ms.other):
+            rev = cl.index.get_rev(node)
+            if rev is not None:
+                pinned.add(rev)
 
     return pinned
 

--- a/tests/test-obsolete.t	Thu Sep 10 17:44:34 2020 +0900
+++ b/tests/test-obsolete.t	Fri Oct 02 07:56:01 2020 -0700
@@ -1790,3 +1790,44 @@
   d1b09fe3ad2b2a03e23a72f0c582e29a49570145 1a1a11184d2588af24e767e5335d5d9d07e8c550 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '8', 'note': 'Testing::Obsstore', 'operation': 'amend', 'user': 'test'}
   1bfd8e3868f641e048b6667cd672c68932f26d00 79959ca316d5b27ac6be1dd0cfd0843a5b5412eb 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '8', 'note': 'Testing::Obsstore2', 'operation': 'amend', 'user': 'test'}
   $ cd ..
+
+Test that pinning of revisions in broken mergestate doesn't cause crash
+
+  $ hg init pinning-broken-mergestate
+  $ cd pinning-broken-mergestate
+  $ echo a > file
+  $ hg ci -Aqm first
+Create a pruned commit so pinning comes into play
+  $ echo pruned > pruned
+  $ hg ci -Aqm pruned
+  $ hg co -q 0
+  $ hg debugobsolete $(getid pruned)
+  1 new obsolescence markers
+  obsoleted 1 changesets
+Back up changelog, so we can restore it later after causing merge conflicts
+with it, thus ending up with mergestate that points to a non-existent commit
+  $ cp .hg/store/00changelog.i .hg/store/00changelog.i.first
+  $ echo b > file
+  $ hg ci -qm second
+  $ echo c > file
+  $ hg co -m 0
+  merging file
+  warning: conflicts while merging file! (edit, then use 'hg resolve --mark')
+  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
+  use 'hg resolve' to retry unresolved file merges
+  [1]
+  $ mv -f .hg/store/00changelog.i.first .hg/store/00changelog.i
+The local node should now point to a non-existent commit
+  $ hg debugmergestate
+  local (working copy): b73b8c9a4ab4da89a5a35a6f10dfb13edc84ca37
+  other (destination): f53e9479dce52f79c923908241fa54f7da90a7ad
+  file: file (state "u")
+    local path: file (hash 971c419dd609331343dee105fffd0f4608dc0bf2, flags "")
+    ancestor path: file (node bc7ebe2d260cff30d2a39a130d84add36216f791)
+    other path: file (node b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3)
+    extra: ancestorlinknode = b73b8c9a4ab4da89a5a35a6f10dfb13edc84ca37
+We should be able to see the log (without the deleted commit, of course)
+  $ hg log -G
+  @  0:f53e9479dce5 (draft) [tip ] first
+  
+  $ cd ..