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add constraint spans to vm circuits #201

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slumber opened this issue Jun 25, 2024 · 0 comments

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slumber commented Jun 25, 2024

If this constraint isn't satisfied, arkworks won't be able to log it even if subscriber is enabled:

nexus-zkvm/vm/src/circuit/step.rs

Line 92 in a6b3e24

cs.enforce_constraint(row(&rcs.a[i]), row(&rcs.b[i]), row(&rcs.c[i]))?;

because there's no span. See, for example:
https://github.com/arkworks-rs/r1cs-std/blob/4020fbc22625621baa8125ede87abaeac3c1ca26/src/boolean/allocated.rs#L72

For debugging purpose, and at least while we use arkworks, spans locating unsat constraints are useful for debugging.

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