https://git.ruby-lang.org/ruby.git/commit/?id=51d161980a

From 51d161980ae0e26602eb17bed5f9cc0beb61f9a3 Mon Sep 17 00:00:00 2001
From: "Thomas E. Enebo" <tom.enebo@g...>
Date: Thu, 10 Nov 2022 13:37:57 -0600
Subject: [ruby/racc] Make racc test more flexible (for JRuby).

JRuby uses these same files for testing racc. The existing logic will not
find 'racc' in a JRuby project checkout. This change allows it to work by
just assuming 'ruby -S racc' when running tests. This will not change C
Ruby's detection when setting up tests (since earlier checks will find
racc).

https://github.com/ruby/racc/commit/b74ce5e018
---
 test/racc/case.rb | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/test/racc/case.rb b/test/racc/case.rb
index d917f3a4e4..ebc30b8288 100644
--- a/test/racc/case.rb
+++ b/test/racc/case.rb
@@ -17,6 +17,8 @@ module Racc https://github.com/ruby/ruby/blob/trunk/test/racc/case.rb#L17
     TEST_DIR = test_dir
     racc = File.join(PROJECT_DIR, 'bin', 'racc')
     racc = File.join(PROJECT_DIR, '..', 'libexec', 'racc') unless File.exist?(racc)
+    racc = 'racc' unless File.exist?(racc)
+
     RACC = racc
     ASSET_DIR = File.join(TEST_DIR, 'assets') # test grammars
     REGRESS_DIR  = File.join(TEST_DIR, 'regress') # known-good generated outputs
-- 
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