Provide a simpler test for const-generics

[jmg-duarte]

As it stands, the test for const-generics fails for version 1.51.0

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error[E0277]: `[T; N]` is not an iterator
  --> tests/pass/13-const-generics.rs:11:33
   |
11 |         IntoIterator::into_iter(arr).collect()
   |                                 ^^^
   |                                 |
   |                                 expected an implementor of trait `IntoIterator`
   |                                 help: consider borrowing here: `&arr`
   |
   = note: the trait bound `[T; N]: IntoIterator` is not satisfied
   = note: required because of the requirements on the impl of `IntoIterator` for `[T; N]`
   = note: required by `into_iter`

error[E0599]: the method `collect` exists for array `[T; N]`, but its trait bounds were not satisfied
  --> tests/pass/13-const-generics.rs:11:38
   |
11 |         IntoIterator::into_iter(arr).collect()
   |                                      ^^^^^^^ method cannot be called on `[T; N]` due to unsatisfied trait bounds
   |
   = note: the following trait bounds were not satisfied:
           `[T; N]: Iterator`
           which is required by `&mut [T; N]: Iterator`
           `[T]: Iterator`
           which is required by `&mut [T]: Iterator`
┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈

Finding a simpler test that works would allow test runs for 1.50.0

[MingweiSamuel]

Ah yeah arr.into_iter() is janky, requires rust 1.53 https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html

But its pretty easy to switch to something else for the example

[jmg-duarte]

Fixed by e59df00