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A forward declaration declares the name of an interface without defining it. This permits the definition of interfaces that
refer to each other. The syntax is: optionally either the keyword abstract or the keyword local, followed by the keyword interface,
followed by an <identifier> that names the interface.
Multiple forward declarations of the same interface name are legal.
It is illegal to inherit from a forward-declared interface whose definition has not yet
been seen:module Example { interface base;}; |
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| // Forward declaration | |||||
| // ... | |||||
| interface derived : baseinterface base {}; interface derived : base | {}; // Error // Define base {}; // OK |