fix: parenthesize pointer newtype cast in match patterns

[ivov]

Matching a newtype over Ref<T> failed to compile because the destructuring path emitted an unparenthesized pointer cast like *int(w), which Go parses as multiplication. The non-pattern form w.0 already parenthesizes pointer types; pattern emission now does the same, producing (*int)(w).

struct Wrap(Ref<int>)

fn main() {
  let mut x = 5
  let w = Wrap(&x)
  match w {
    Wrap(r) => fmt.Println(r.*),
  }
}

[github-actions]

Released in lisette-v0.2.1