https://git.ruby-lang.org/ruby.git/commit/?id=3fafc549ba

From 3fafc549ba909e986917f2b6b96eb14624c26329 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 7 Sep 2019 11:35:00 +0900
Subject: Fix error when checking file modified with git-svn


diff --git a/tool/lib/vcs.rb b/tool/lib/vcs.rb
index f124564..2a6a4b5 100644
--- a/tool/lib/vcs.rb
+++ b/tool/lib/vcs.rb
@@ -476,7 +476,8 @@ class VCS https://github.com/ruby/ruby/blob/trunk/tool/lib/vcs.rb#L476
         if changed == last
           last = rev
         else
-          last = svn_revision(cmd_read_at(srcdir, [[*gitcmd, 'log', '-n1', '--format=%B', last]]))
+          svn_rev = svn_revision(cmd_read_at(srcdir, [[*gitcmd, 'log', '-n1', '--format=%B', last]]))
+          last = svn_rev if svn_rev
         end
         changed = rev
       end
-- 
cgit v0.10.2


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