[compiler] Repro for missing memoization due to inferred mutation #30764
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This fixture bails out on ValidatePreserveExistingMemo but would ideally memoize since the original memoization is safe. It's trivial to make it pass by commenting out the commented line (`LogEvent.log(() => object)`). I would expect the compiler to infer this as possible mutation of `logData`, since `object` captures a reference to `logData`. But somehow `logData` is getting memoized successfully, but we still infer the callback, `setCurrentIndex`, as having a mutable range that extends to the `setCurrentIndex()` call after the useCallback. [ghstack-poisoned]
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josephsavona
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Aug 20, 2024
This fixture bails out on ValidatePreserveExistingMemo but would ideally memoize since the original memoization is safe. It's trivial to make it pass by commenting out the commented line (`LogEvent.log(() => object)`). I would expect the compiler to infer this as possible mutation of `logData`, since `object` captures a reference to `logData`. But somehow `logData` is getting memoized successfully, but we still infer the callback, `setCurrentIndex`, as having a mutable range that extends to the `setCurrentIndex()` call after the useCallback. ghstack-source-id: 1785689 Pull Request resolved: #30764
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This was referenced Aug 21, 2024
…utation" This fixture bails out on ValidatePreserveExistingMemo but would ideally memoize since the original memoization is safe. It's trivial to make it pass by commenting out the commented line (`LogEvent.log(() => object)`). I would expect the compiler to infer this as possible mutation of `logData`, since `object` captures a reference to `logData`. But somehow `logData` is getting memoized successfully, but we still infer the callback, `setCurrentIndex`, as having a mutable range that extends to the `setCurrentIndex()` call after the useCallback. [ghstack-poisoned]
This was referenced Aug 22, 2024
josephsavona
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Aug 22, 2024
This fixture bails out on ValidatePreserveExistingMemo but would ideally memoize since the original memoization is safe. It's trivial to make it pass by commenting out the commented line (`LogEvent.log(() => object)`). I would expect the compiler to infer this as possible mutation of `logData`, since `object` captures a reference to `logData`. But somehow `logData` is getting memoized successfully, but we still infer the callback, `setCurrentIndex`, as having a mutable range that extends to the `setCurrentIndex()` call after the useCallback. ghstack-source-id: 4f82e34 Pull Request resolved: #30764
This was referenced Aug 27, 2024
Akshato07
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Feb 20, 2025
This fixture bails out on ValidatePreserveExistingMemo but would ideally memoize since the original memoization is safe. It's trivial to make it pass by commenting out the commented line (`LogEvent.log(() => object)`). I would expect the compiler to infer this as possible mutation of `logData`, since `object` captures a reference to `logData`. But somehow `logData` is getting memoized successfully, but we still infer the callback, `setCurrentIndex`, as having a mutable range that extends to the `setCurrentIndex()` call after the useCallback. ghstack-source-id: 4f82e34 Pull Request resolved: facebook/react#30764
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Stack from ghstack (oldest at bottom):
This fixture bails out on ValidatePreserveExistingMemo but would ideally memoize since the original memoization is safe. It's trivial to make it pass by commenting out the commented line (
LogEvent.log(() => object)). I would expect the compiler to infer this as possible mutation oflogData, sinceobjectcaptures a reference tologData. But somehowlogDatais getting memoized successfully, but we still infer the callback,setCurrentIndex, as having a mutable range that extends to thesetCurrentIndex()call after the useCallback.