Question: Does functions does accept array elements as parameters?

Hello. I've tried to create function with x[1] variable, but at any time I receive the following error: > f := x[1] -> x[1]; Error, symbol or symbol::type or symbol:=expression expected in parameter list What is the problem here? IIUC x[1] is the element 1 of array x. So does maple forbid usage of array elements in function definitions? Thank you for your time.
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