https://git.ruby-lang.org/ruby.git/commit/?id=ed3333f873

From ed3333f8736e054a2199a3b77e553b858c5fc7e6 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 22 Oct 2019 21:05:52 +0900
Subject: make-snapshot: Regexp#match raises on nil now


diff --git a/tool/lib/vcs.rb b/tool/lib/vcs.rb
index 370530d..1868553 100644
--- a/tool/lib/vcs.rb
+++ b/tool/lib/vcs.rb
@@ -605,7 +605,7 @@ class VCS https://github.com/ruby/ruby/blob/trunk/tool/lib/vcs.rb#L605
         end
         rev unless rev.empty?
       end
-      unless /./.match(from) or /./.match(from = branch_beginning(url))
+      unless (from && /./.match(from)) or ((from = branch_beginning(url)) && /./.match(from))
         warn "no starting commit found", uplevel: 1
         from = nil
       end
-- 
cgit v0.10.2


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