[m-users.] Stuck trying to compile simple program

[zeldangit]

Hello,

I am currently making my way through Ralph Becket Mercury tutorial and I am
stuck trying to add a simple length function to my program. Here it is
along with the error I am having
<https://gist.github.com/zeldangit/9448809d80f7613d74189feb9f5529ac>. Any
help would be much appreciated.

Thanks,
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