rb_thread_debug_enabled  228 thread.c       static int rb_thread_debug_enabled;
rb_thread_debug_enabled  241 thread.c           return INT2NUM(rb_thread_debug_enabled);
rb_thread_debug_enabled  255 thread.c           rb_thread_debug_enabled = RTEST(val) ? NUM2INT(val) : 0;
rb_thread_debug_enabled  319 thread.c           if (!rb_thread_debug_enabled) return;