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Expressions that simply evaluate with messages are not returned wrapped in Hold, and there is no problem assigning these to a Symbol: expr = Map[1, 2, 3, 4]; ?expr Map::nonopt: Options expected (instead of 4) beyond position 3 in Map[1,2,3,4]. An option must be a rule or a list of rules. >> Global`expr expr = Map[1, 2, 3, 4] Your use of Return ...



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