RUBY_FREE_UNLESS_NULL  223 cont.c         	RUBY_FREE_UNLESS_NULL(cont->saved_thread.stack);
RUBY_FREE_UNLESS_NULL  228 cont.c         	    RUBY_FREE_UNLESS_NULL(cont->machine.stack);
RUBY_FREE_UNLESS_NULL  259 cont.c         	RUBY_FREE_UNLESS_NULL(cont->machine.stack);
RUBY_FREE_UNLESS_NULL  262 cont.c         	RUBY_FREE_UNLESS_NULL(cont->machine.register_stack);
RUBY_FREE_UNLESS_NULL  264 cont.c         	RUBY_FREE_UNLESS_NULL(cont->vm_stack);
RUBY_FREE_UNLESS_NULL 2293 vm.c           	    RUBY_FREE_UNLESS_NULL(th->stack);