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Static Semantics.
Circular reference between modules that involving Const Declarations (section 5.2.3.2), Enum Declarations (section 5.2.3.4), UDT Declarations (section 5.2.3.3), Implements Directive (section 5.2.4.2), or Event Declarations (section 5.2.4.3) are not allowed.
Any circular dependency among modules that includes any of these declaration forms is an illegal circularity, even if the dependency chain includes other forms of declaration.
Circular dependency chains among modules that do not include any of these specific declaration forms are allowed.