Modifying the Structure of the Instance

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7.2.1 Modifying the Structure of the Instance

In order to make the instance conform to the class C_to, local slots specified by the class C_to that are not specified by the class C_from are added, and local slots not specified by the class C_to that are specified by the class C_from are discarded.

The values of local slots specified by both the class C_to and the class C_from are retained. If such a local slot was unbound, it remains unbound.

The values of slots specified as shared in the class C_from and as local in the class C_to are retained.

This first step of the update does not affect the values of any shared slots.