provide diagnostic information instead of SEGV when a bound tool is disabled
Bound tools do not support disabling currently -- see #214. This MR replaces an opaque SEGV with a (hopefully informative) message as to what is about to go wrong instead.
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Bound tools do not support disabling currently -- see #214. This MR replaces an opaque SEGV with a (hopefully informative) message as to what is about to go wrong instead.