T7294.hs:27:1: warning: [-Woverlapping-patterns (in -Wdefault)]
    Pattern match is redundant
    In an equation for ‘nth’: nth Nil _ = ...

T7294.hs:27:5: warning: [-Winaccessible-code (in -Wdefault)]
    • Inaccessible code in
        a pattern with constructor: Nil :: forall a. Vec a 'Zero,
        in an equation for ‘nth’
      Couldn't match type ‘'False’ with ‘'True’
    • In the pattern: Nil
      In an equation for ‘nth’: nth Nil _ = undefined