Disable experimental warnings in test/runner.rb

test/runner.rb

@@ -4,6 +4,8 @@
 ENV["GEM_SKIP"] = ENV["GEM_HOME"] = ENV["GEM_PATH"] = "".freeze
 ENV.delete("RUBY_CODESIGN")
 
+Warning[:experimental] = false
+
 # Get bundled gems on load path
 Dir.glob("#{__dir__}/../.bundle/gems/*/*.gemspec")
   .reject {|f| f =~ /minitest|test-unit|power_assert/ }

tool/test/runner.rb

@@ -12,8 +12,6 @@ require "iseq_loader_checker"
 require "gc_checker"
 require_relative "../test-coverage.rb" if ENV.key?('COVERAGE')
 
-Warning[:experimental] = false
-
 case $0
 when __FILE__
   dir = __dir__