Backport "Fixes #24414: Fix StaleSymbolException in Namer.addChild after compilation suspension" to 3.3 LTS - #1058
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Backport "Fixes #24414: Fix StaleSymbolException in Namer.addChild after compilation suspension" to 3.3 LTS#1058tgodzik wants to merge 2 commits into
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When `addChild` inspects a parent's existing Child annotations, forcing their lazy tree may dereference a child symbol from a previous run. If compilation was suspended (due to inline/macro processing) and the child class has been re-typechecked in the current run, the captured symbol is stale and accessing its owner triggers `StaleSymbol`. This manifests when a sealed parent is in a pre-compiled artifact and a subclass in user code uses an inline given that causes suspension: the parent's annotation list ends up holding a Child annotation pointing to the suspended-run version of the subclass. Treat such Child annotations as stale and drop them; the new run will have re-registered the child anyway. Fixes scala#24414 [Cherry-picked 3f30937]
Add a `NonStaleChild` extractor in `Annotations` that wraps `Child` with a `StaleSymbol` catch, and use it in `Namer.addChild` so the surrounding logic stays untouched. [Cherry-picked 05d29fd][modified]
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Backports scala#26019 to the 3.3.9.
PR submitted by the release tooling.
[skip ci]