Inter-type member declarations
      Each inter-type member is one of
    
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            Modifiers ReturnType OnType . Id
            ( Formals )
            [ throws TypeList ]
            { Body }
          
        
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          a method on OnType.
        
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            abstract Modifiers ReturnType OnType . Id
            ( Formals )
            [ throws TypeList ] ;
          
        
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          an abstract method on OnType.
        
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            Modifiers OnType .  new
            ( Formals )
            [ throws TypeList ]
            { Body }
          
        
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          a constructor on OnType.
        
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            Modifiers Type OnType . Id 
            [ = Expression ] ;
          
        
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          a field on OnType.