@brief Simple container to be thrown when internal error is detected. */

local struct used in setVarId in order to store information about the scope

* @brief Array dimension information. */

avoid one-definition-rule violation

在4字节对齐的情况下，sizeof(A)的大小是12字节，调换字段b和c的位置A的大小可减少为8字节

* @brief Access control enumerations. */