[m-rev.] for review: Do not use stateful-error style in io.m; minor bug fixes.

[Julien Fischer]

Hi Peter,

On Tue, 27 Sep 2016, Peter Wang wrote:

> library/io.m:
>    Make remaining I/O primitives return error codes directly to Mercury
>    wrapper predicates, instead of saving the error in a global variable
>    to be looked up separately.
>
>    Delete stateful-error predicates and global variables.
>
>    Delete unnecessary foreign exported procedures.

...

That's fine.

Julien.