[metapost] Filling an array

[Troy Henderson]

I would like to create a function that fills an array (that is passed to
the function).  I tried

def fillarray (expr x) =
   for n=1 upto 10:
      x[n]:=n;
   endfor;
enddef;

numeric x[];

but when I tried calling the function with

fillarray(x);

or with

fillarray(x[]);

I get error(s).  Can a function be defined in MetaPost to fill an array?

Thanks,

Troy Henderson
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