RUBY_GC_INFO       76 iseq.c         	RUBY_GC_INFO("%s @ %s\n", RSTRING_PTR(iseq->name), RSTRING_PTR(iseq->filename));
RUBY_GC_INFO      206 vm.c           	    RUBY_GC_INFO("env->env\n");
RUBY_GC_INFO      210 vm.c           	RUBY_GC_INFO("env->prev_envval\n");
RUBY_GC_INFO     1419 vm.c               RUBY_GC_INFO("-------------------------------------------------\n");
RUBY_GC_INFO     1538 vm.c           	    RUBY_GC_INFO("main thread\n");