The `@' type descriptor is for a member (class and variable) type. It is followed by type information for the offset basetype, a comma, and type information for the type of the field being pointed to. (FIXME: this is acknowledged to be gibberish. Can anyone say what really goes here?).
Note that there is a conflict between this and type attributes (see section The String Field); both use type descriptor `@'. Fortunately, the `@' type descriptor used in this C++ sense always will be followed by a digit, `(', or `-', and type attributes never start with those things.
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