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Track if EvalCtxt has been tainted, make sure it can't be used to make query res...
source link: https://github.com/rust-lang/rust/pull/110618
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Just some additional protection against missing probes or strange candidate assembly behavior in the new solver.
For background, we don't ever want to call evaluate_added_goals_and_make_canonical_response if a previous call to try_evaluate_added_goals has bailed with NoSolution, since our nested goals are left in an undefined state at that point. This most commonly suggests a missing EvalCtxt::probe, but could also signify some other shenanigans like dropping a QueryResult on the floor without properly ?'ing it.
r? @lcnr
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