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Ideally, this shouldn't be needed, as we already cache `inferType`. However, since we have consistency checks that directly call `inferCertainType`, we need to cache it as well to avoid recomputation.
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Pull Request Overview
This PR adds caching to the inferCertainType predicate in the Rust type inference library to avoid recomputation during nightly DCA (Dataflow Coverage Analysis). The change complements the existing caching of inferType, which is needed because consistency checks directly call inferCertainType.
- Moved
CachedStagesimport to top-level module scope - Added
cachedannotation toinferCertainTypepredicate - Added stage reference constraint to control evaluation timing
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geoffw0
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Nov 18, 2025
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nightly DCA (Dataflow Coverage Analysis)
Good guess, Copilot. Wrong, but good guess.
LGTM. I suspect the improvement won't affect most customers (since they have little reason to run the consistency checks), but its a nice improvement to have nonetheless.
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Ideally, this shouldn't be needed, as we already cache
inferType. However, since we have consistency checks that directly callinferCertainType, we need to cache it as well to avoid recomputation in nightly DCA.