To me this is a bug and I cannot find it in the documentation as a feature. You can quite happily write:
replace item -1 of list_name with thing
It does not appear to do anything but it does not complain either. I would have expected an error message or something. (If you divide by 0 you get a red line round the code for example.)
You can replace the -1 by 0 or by a variable with an out of range value (as I did) and still get no error.
Peter
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