[m-rev.] for post-commit review: determinism error messages

[Zoltan Somogyi]

On Fri, 13 May 2016 09:44:25 +1000, Paul Bone <paul at bone.id.au> wrote:
> There is an opportunity for optimisation here.  Rather than building up a
> set of contexts you only need to track the smallest context seen so far.

You are right, which is why I am committing the attached diff.

> The code is correct how it is and already committed, so I wouldn't worry
> about it unless we wanted, for some reason, to improve the performance of an
> error handling routine (rarely executed).

While the context this code sets is only USED when there is an error,
the code itself is EXECUTED every time a switch is detected.

Zoltan.

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