anchor.diff:          ReturnStatement,
           Statement,
           StaticGet,
  -        StaticInvocation,
           StaticSet,
           StringConcatenation,
           SuperInitializer,
  
positive.code:         ShadowPropertyAssign,
          ShadowPropertyGet,
          ShadowRedirectingInitializer,
          ShadowRethrow,
          ShadowReturnStatement,
          ShadowStaticAssignment,
          ShadowStaticGet,
  
negative.code:         ShadowSuperPropertyGet,
          ShadowSwitchStatement,
          ShadowSyntheticExpression,
          ShadowTryCatch,
          ShadowTryFinally,
          ShadowVariableAssignment,
  