This particular rule is essentially unchanged from C89 (3.5.7 for initialization, 3.3.16.1 for simple assignment) and from C99 (6.7.8 for initialization, 6.5.16

This particular rule is essentially unchanged from C89 (3.5.7 for initialization, 3.3.16.1 for simple assignment) and from C99 (6.7.8 for initialization, 6.5.16.1 for simple assignment). Generally, most existing rules don't change much at all across the C Standard versions.