It has caused CI failures.
* d0cd0866d8
Disable GC during rb_objspace_reachable_object_p
* 89cef1c56b
Version guard for [Feature #15974]
* 796eeb6339.
Fix up [Feature #15974]
* 928260c2a6.
Warn in verbose mode on defining a finalizer that captures the object
* Other ruby implementations use the spec/ruby directory.
[Misc #13792] [ruby-core:82287]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e