Inverse equality saturation #1
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Also, remove `dbg!` statements and don't mark egraph as dirty after removing enodes
Matches type signature of `Runner::run`
Breaks explanations, specifically `diff_power_harder` in tests/math.rs fails
Oddly this appears to result in more failures in `cargo test --test math`.
Turns out the math.rs tests were modifying the egraph (see https://github.com/egraphs-good/egg/blob/ae2db378d25dbe55046d96a7eef25ee9f2916058/tests/math.rs#L98-L99), so the `None` path being taken is actually a bug if enodes aren't being removed by my code (`remove_enodes` specifically).
Compare by value instead of ID, since an enode may have multiple IDs (at least in `egraph.nodes`).
Also, hardcode running inverse equality saturation every iteration for now.
Also improve checking egraph validity when `cfg(debug_assertions)`
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Entry point is
egraph.undo_rewrites().For testing,
undo_rewritesis hardcoded to run every iteration of equality saturation. This is too aggressive for real usage, since it strips away useful e-nodes before they can be extracted. As a result most test cases fail (errors are usually of the formgoal is not reached). However, inverse equality saturation should never "break" the egraph — right now it skips removing enodes from the original egraph (before rewrites were applied).Currently,
undo_rewritescannot handle multipatterns (onlyPatterns) and does not work with explanations enabled.