[m-rev.] for review: io.make_temp now reterns a result rather than throw exceptions

[Peter Wang]

On Wed, 20 Apr 2016 12:44:38 +1000, Paul Bone <paul at bone.id.au> wrote:
> For review by Peter Wang who suggested this change.

Hi Paul,

Can you resend with diff -w?  Some parts are hard to follow.

Peter