https://git.ruby-lang.org/ruby.git/commit/?id=fc913ad21d

From fc913ad21dcb04bd3d3786f9a3072a6717a52a9a Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 9 Oct 2021 16:17:37 +0900
Subject: Exclude also core_assertions.rb from backtraces

---
 tool/lib/test/unit.rb | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tool/lib/test/unit.rb b/tool/lib/test/unit.rb
index c489e5ab66..c113e7e4fd 100644
--- a/tool/lib/test/unit.rb
+++ b/tool/lib/test/unit.rb
@@ -21,14 +21,15 @@ module Test https://github.com/ruby/ruby/blob/trunk/tool/lib/test/unit.rb#L21
       return ["No backtrace"] unless bt
 
       new_bt = []
+      pattern = %r[/(?:lib\/test/|core_assertions\.rb:)]
 
       unless $DEBUG then
         bt.each do |line|
-          break if line =~ /lib\/test/
+          break if pattern.match?(line)
           new_bt << line
         end
 
-        new_bt = bt.reject { |line| line =~ /lib\/test/ } if new_bt.empty?
+        new_bt = bt.reject { |line| pattern.match?(line) } if new_bt.empty?
         new_bt = bt.dup if new_bt.empty?
       else
         new_bt = bt.dup
-- 
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