ctf-assignment-expression:
unary-expression assignment-operator unary-expression
unary-expression type-assignment-operator type-specifier
declaration-specifiers-opt storage-class-specifier declaration-specifiers-opt declarator-list
ctf-assignment-expression:
unary-expression assignment-operator unary-expression
unary-expression type-assignment-operator type-specifier
declaration-specifiers-opt storage-class-specifier declaration-specifiers-opt declarator-list