Abstract aggregate as a common ancestor for Class- and StructDeclaration.
The ClassKind enum is used in AggregateDeclaration AST nodes to specify the linkage type of the struct/class/interface or if it is an anonymous class. If the class is anonymous it is also considered to be a D class.
Defines a Dsymbol representing an aggregate, which is a struct, union or class.
Specification: Structs, Class.