[ruby-cvs:66246] ko1:r59069 (trunk): add a comment for rb_thread_mark()

[ko1 at ruby-lang.org]

ko1	2017-06-12 16:58:23 +0900 (Mon, 12 Jun 2017)

  New Revision: 59069

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=59069

  Log:
    add a comment for rb_thread_mark()

  Modified files:
    trunk/vm.c