916004bd3c
This PR moves `hasAssignableMVar`, `hasAssignableLevelMVar`, and `isLevelMVarAssignable` from `MetavarContext.lean` to a new `Lean.Meta.HasAssignableMVar` module, changing them from generic `[Monad m] [MonadMCtx m]` functions to `MetaM` functions. This enables adding `checkSystem` calls in the recursive traversal, which ensures cancellation and heartbeat checks happen during what can be a very expensive computation. All callers of these functions were already in `MetaM`, so this change is safe. The motivating case is the `4595_slowdown.lean` test, where `hasAssignableMVar` (with `PersistentHashMap.find?` lookups on `mctx.lDepth`) was the dominant CPU cost during elaboration of category theory definitions. Without `checkSystem` calls, cancellation requests could be delayed by over 2 seconds. The test file `4595_slowdown.lean` gets a slightly increased `maxHeartbeats` limit because `checkSystem` now detects heartbeat exhaustion mid-traversal rather than after the function returns. Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
12 lines
804 B
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12 lines
804 B
Text
4595_slowdown.lean:106:14-106:25: warning: declaration uses `sorry`
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4595_slowdown.lean:138:9-138:17: warning: declaration uses `sorry`
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4595_slowdown.lean:156:8-156:16: warning: declaration uses `sorry`
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4595_slowdown.lean:183:8-183:14: warning: declaration uses `sorry`
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4595_slowdown.lean:185:8-185:14: warning: declaration uses `sorry`
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4595_slowdown.lean:188:0-188:8: warning: declaration uses `sorry`
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4595_slowdown.lean:196:8-196:19: warning: declaration uses `sorry`
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4595_slowdown.lean:199:8-199:15: warning: declaration uses `sorry`
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4595_slowdown.lean:209:4-209:13: warning: declaration uses `sorry`
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4595_slowdown.lean:231:8-231:14: warning: declaration uses `sorry`
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4595_slowdown.lean:233:8-233:16: warning: declaration uses `sorry`
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4595_slowdown.lean:235:4-235:11: warning: declaration uses `sorry`
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