add Ractor.main

It returns main Ractor, like Thread.main.
[Feature #17418]

1 files changed, 7 insertions, 0 deletions

diff --git a/bootstraptest/test_ractor.rb b/bootstraptest/test_ractor.rb
index 06bd739931..843714a7bc 100644
--- a/bootstraptest/test_ractor.rb
+++ b/bootstraptest/test_ractor.rb
@@ -396,6 +396,13 @@ assert_equal 'ok', %q{
   end
 }
 
+# Ractor.main returns main ractor
+assert_equal 'true', %q{
+  Ractor.new{
+    Ractor.main
+  }.take == Ractor.current
+}
+
 # a ractor with closed outgoing port should terminate
 assert_equal 'ok', %q{
   Ractor.new do