I get Error 0505 on this snip:

		let ps0 = expand(ps[0]);
		let ps1 = expand(ps[1]);
		println!("The product of {:?} and {:?} is {:?}",
			ps0, ps1, product(ps0, ps1))

All variables are of type Vec<u8>.
The function product does NOT change its arguments, and the compiler should know that. Still, this does not compile. What do I do wrong?

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