From e23c02959040dcd5c399bbac84fed4ef2eae1ec0 Mon Sep 17 00:00:00 2001
From: Kazuki Yamaguchi <k@rhe.jp>
Date: Fri, 3 Oct 2025 16:37:19 +0900
Subject: [PATCH] Fix EnvUtil.invoke_ruby on Ruby < 3.3

Only pass --parser= option to Ruby versions that accept it.
test-unit-ruby-core currently supports Ruby >= 2.3.
---
 lib/envutil.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/envutil.rb b/lib/envutil.rb
index ab5e8d8..71f7b96 100644
--- a/lib/envutil.rb
+++ b/lib/envutil.rb
@@ -225,7 +225,7 @@ def invoke_ruby(args, stdin_data = "", capture_stdout = false, capture_stderr =
 
     args = [args] if args.kind_of?(String)
     # use the same parser as current ruby
-    if args.none? { |arg| arg.start_with?("--parser=") }
+    if RUBY_VERSION >= "3.3" && args.none? { |arg| arg.start_with?("--parser=") }
       args = ["--parser=#{current_parser}"] + args
     end
     pid = spawn(child_env, *precommand, rubybin, *args, opt)