Branch handling `*[N]T` to `E![]T` is already handled in a more complete
branch handling `*[N]T` to `[]T` *and* `*[N]T` to `E![]T` so it seems
safe to remove this one.
04c3fae720Jakub Konka committed on 6/16/2020, 10:24:45 PM· committed by Andrew Kelleyparentf595545