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specification.
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specification. In other words, it is an error to call this function
more
than once in a class definition.
Note that the given interfaces have nothing to do with the interfaces
implemented by instances of the class.
This function is provided for convenience. It provides a more
convenient
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error will be raised if the module already has an interface
specification.
In other words, it is an error to call this function more than once in
a
module definition.
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convenient
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moduleImplements(I1)
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the `__providedBy__` attribute
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declaration arguments
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