How to compile ice files under folder slice

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Here errors when I compile these files under folder slice:
Thanks.
I go to line 13 of BuiltinSequences.ice, found here is statement:BuiltinSequences.ice:13: illegal identifier `Ice': `Ice' prefix is reserved
seems can't use reserved word Ice in ice file, so I confused how to compile it.module Ice
Thanks.
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Take care,
- Mark