import M3._+
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assert(nullable(ZERO) == false)+
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assert(nullable(ONE) == true)+
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assert(nullable(CHAR('a')) == false)+
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assert(nullable(ZERO | ONE) == true)+
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assert(nullable(ZERO | CHAR('a')) == false)+
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assert(nullable(ONE ~  ONE) == true)+
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assert(nullable(ONE ~ CHAR('a')) == false)+
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assert(nullable(STAR(ZERO)) == true)+
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assert(nullable(ALTs(List(ONE, CHAR('a'), ZERO))) == true)+
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assert(nullable(SEQs(List(ONE, ALTs(List(ONE, CHAR('a'), ZERO)), STAR(ZERO)))) == true)+
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