Cannot write type annotation for variadic function

[Chriscbr]

I tried this:

Giving an explicit type annotation for a variadic function:

let t5: (...Array<num>): num = (...arr: Array<num>) => {
  let var total = 0;
  for x in arr {
    total += x;
  }
  return total;
};

This happened:

Syntax error

I expected this:

No error

Is there a workaround?

Let the type be inferred

Anything else?

No response

Wing Version

0.85.12

Node.js Version

No response

Platform(s)

MacOS

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