A-querybuggood first bughelp wanted
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Description
When leaving an :in variable unbound, like in:
[:find
?e
:in
?f ?unused
:where
[(= e f)]
]
After binding only ?f, we panic at https://github.com/mozilla/mentat/blob/0c31fc7875294fdf80f4caf253590999a9214e0d/query-algebrizer/src/clauses/mod.rs#L147
That code is trying to be careful, but the issue is that the subtraction underflows in the above circumstance, since we're subtracting usize instances.