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[FYI 0/3] Fix exponential behavior in rust_evaluate_subexp


This fixes a bug noticed by a Rust user, where evaluating a certain
expression took a very long time -- 1.5 minutes.  While working on
this, though, I noticed a couple of other minor problems in the Rust
code, so this series fixes them all.

There are no new tests in this series.  Expression dumping isn't
generally tested, and I didn't know of a good way to check for lack of
exponential behavior.

Regression tested on the buildbot.

I would like to put this, or at least patch #3, on the 8.0 branch.

I'm checking this in to master.

thanks,
Tom


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