[m-rev.] Improved array error messages

[Peter Ross]

Ralph wrote:
> +
> +    % out_of_bounds_error(OpName, Array, Index) = IndexOutOfBounds.
> +    %
> +:- func out_of_bounds_error(string, array(T), int) = index_out_of_bounds.
> +
> +out_of_bounds_error(Op, A, I) =
> +    index_out_of_bounds(
> +        string__format("%s: array bounds [%d, %d], index %d",
> +        [s(Op), i(array__min(A)), i(array__max(A)), i(I)])
>      ).
>
I suggest printing out the type of the array which is similar to what is
done for map lookup failures.

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