rb_thread_debug_enabled  144 thread.c       static int rb_thread_debug_enabled;
rb_thread_debug_enabled  149 thread.c           return INT2NUM(rb_thread_debug_enabled);
rb_thread_debug_enabled  155 thread.c           rb_thread_debug_enabled = RTEST(val);
rb_thread_debug_enabled  208 thread.c           if (!rb_thread_debug_enabled) return;