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[REBOL] How to check function arguments ?

From: jason::cunliffe::verizon::net at: 8-Jun-2002 11:54

It's kind of embarrassing, but I've forgotten the REBOL idioms for something really basic.. How to check for arguments provided to a function? How to check when the argument is optional and when it is missing? somefunc: func [arg1 arg2 ... argN] [ ; check args here and respond ] thanks ./Jason