Description:
------------
Address sanitizer detected a use after scope error in zend_compile.c - in the 
current GIT repository this problem starts at line 5044.

	if (CG(current_namespace)) {
		/* Prefix class name with name of current namespace */
		znode tmp;

		tmp.u.constant = *CG(current_namespace);
		zval_copy_ctor(&tmp.u.constant);
		zend_do_build_namespace_name(&tmp, &tmp, class_name TSRMLS_CC);
		class_name = &tmp;
		efree(lcname);
		lcname = zend_str_tolower_dup(Z_STRVAL(class_name->u.constant), 
Z_STRLEN(class_name->u.constant));
	}

	if (error) {
		char *tmp = zend_str_tolower_dup(Z_STRVAL_PP(ns_name), 
Z_STRLEN_PP(ns_name));

		if (Z_STRLEN_PP(ns_name) != Z_STRLEN(class_name->u.constant) ||
			memcmp(tmp, lcname, Z_STRLEN(class_name->u.constant))) {
			zend_error(E_COMPILE_ERROR, "Cannot declare class %s 
because the name is already in use", Z_STRVAL(class_name->u.constant));
		}
		efree(tmp);
	}


There is a scoped variable "znode tmp" on line 5046. It's address is assigned to 
the 
pointer class_name on line 5051 (class_name = &tmp). class_name is then used on 
line 5059 after the 
value it points to (tmp) has gone out of scope when the block finished on line 
5054.