RUBY_FREE_ENTER   113 cont.c             RUBY_FREE_ENTER("cont");
RUBY_FREE_ENTER   165 cont.c             RUBY_FREE_ENTER("fiber");
RUBY_FREE_ENTER    43 iseq.c             RUBY_FREE_ENTER("iseq");
RUBY_FREE_ENTER    37 proc.c             RUBY_FREE_ENTER("proc");
RUBY_FREE_ENTER   226 proc.c             RUBY_FREE_ENTER("binding");
RUBY_FREE_ENTER   188 vm.c               RUBY_FREE_ENTER("env");
RUBY_FREE_ENTER  1382 vm.c               RUBY_FREE_ENTER("vm");
RUBY_FREE_ENTER  1505 vm.c               RUBY_FREE_ENTER("thread");