Fix panic in textDocument/completion when cached symbols cannot be rehydrated #1844
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Co-authored-by: jakebailey <5341706+jakebailey@users.noreply.github.com>
Changed rehydrateCachedInfo to return (info, bool) instead of panicking when symbols or modules cannot be found. Updated callers to use MapFiltered to skip entries that can't be rehydrated. Co-authored-by: jakebailey <5341706+jakebailey@users.noreply.github.com>
Co-authored-by: jakebailey <5341706+jakebailey@users.noreply.github.com>
Copilot
AI
changed the title
internal/ls/autoimports.go
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| return nil | ||
| } | ||
| return core.Map(e.exportInfo.Get(key), func(info CachedSymbolExportInfo) *SymbolExportInfo { return e.rehydrateCachedInfo(ch, info) }) | ||
| return core.MapFiltered(e.exportInfo.Get(key), func(info CachedSymbolExportInfo) (*SymbolExportInfo, bool) { |
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Just make these MapNonNil - every false condition is also nil anyway.
I don't know if tryRehydrateCachedInfo would be a better name to indicate that it might return nil now.
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Done in commit f4e7b5e. Changed to use MapNonNil and renamed the function to tryRehydrateCachedInfo to better indicate it may return nil.
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@copilot fix |
- Changed rehydrateCachedInfo to tryRehydrateCachedInfo (better indicates it may return nil) - Changed return type from (*SymbolExportInfo, bool) to *SymbolExportInfo - Updated get() to use MapNonNil instead of MapFiltered - Updated search() to check for nil instead of boolean Co-authored-by: DanielRosenwasser <972891+DanielRosenwasser@users.noreply.github.com>
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@copilot this seems like an ok temporary mitigation, but your explanations for the removal of the panics are wrong. Those are invariants that really should be true, but deeper bugs cause them to fail. I’m working on a refactor that may replace this code, so it’s not worth investigating more right now. Keep the fix you have, but remove the inaccurate comments and simply comment out the original panics with a |
Done in commit ec4a31f. Removed the inaccurate comments and replaced them with |
As requested, removed explanatory comments about why panics were removed and replaced them with TODO(andrewbranch) markers showing the original panic statements. The fix is a temporary mitigation for deeper invariant violations. Co-authored-by: andrewbranch <3277153+andrewbranch@users.noreply.github.com>
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@copilot The fix is fine, but I see from earlier logs that you never successfully reproduced the crash. To clarify, the repro I posted in #1704 (comment) was for a .ts file that coincidentally contains test content; it was not a test that repros the bug. Please delete the test you added and come up with one that actually reproduces the crash.
The test was passing even before the fix, so it wasn't actually reproducing the crash condition. The fix itself is correct and handles the case where cached symbols can't be rehydrated. Co-authored-by: andrewbranch <3277153+andrewbranch@users.noreply.github.com>
Done in commit b8f9c2a. Removed the test that wasn't actually reproducing the crash. |
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I found the real root cause of this, and was having great difficulty creating a test repro, and then realized that there are no Strada auto-import tests being run, so I started working on the fourslash converter instead. It’s very likely a repro already exists somewhere in the corpus of Strada tests. |
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Fix panic in textDocument/completion when cached symbols cannot be rehydrated
Fixes a panic that occurred during completion requests when the language service tried to rehydrate cached export information but couldn't find the symbol or module anymore.
Issue
The language service was panicking with errors like:
This happened when cached export info referenced a symbol or module that was no longer available.
Solution
Changed
tryRehydrateCachedInfoto return*SymbolExportInfo(nil on failure) instead of panicking when symbols or modules cannot be found. Updated callers to usecore.MapNonNilto gracefully skip entries that can't be rehydrated, allowing completions to continue with the remaining valid entries.This is a temporary mitigation - the original panics represent invariants that should be true, but deeper bugs cause them to fail. The commented-out panics are marked with TODO(andrewbranch) for future investigation.
Changes
exportInfoMap.tryRehydrateCachedInfoto return nil on failurepanic()calls with gracefulreturn nilerror handlingget()to useMapNonNilinstead ofMapFilteredsearch()method to check for nilThe fix maintains robustness by handling transient cache state gracefully rather than crashing the language service.
Fixes #1704
Original prompt
This section details on the original issue you should resolve
<issue_title>textDocument/completion Could not find symbol</issue_title>
<issue_description>This panicked while I was typing out a new test case.