Arrays are not captured in closures

[kikofernandez]

Given the following example

class Main
  def main(): void
    let arr = [1, 2, 3] in
      repeat i <- |arr|
        let fn = \() -> print arr[i] in
           fn()

the closure doesn't capture the array and the i variable in the environment. Same for async

[kikofernandez]

I believe this is a simple fix, so I'll fix it

[kikofernandez]

closed by @EliasC PR #147