[6.2] Fix some major SILGen bugs with pack handling: #84732
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slavapestov
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Oct 7, 2025
- Calls to variadic-generic protocol requirements weren't applying substitutions properly, so expansion-sensitive types in the callee signature weren't pairing properly with their expansions in the caller. - emitPackTransform had an over-destroy if the transformation function actually emitted into the temporary element directly. - There were some MV ownership assertions that were wrong, which revealed that the corresponding code really didn't handle consuming/ borrowing mismatches properly at all. - We were completely mishandled consuming packs. Fixes swiftlang#81002, swiftlang#80995, and swiftlang#81600.
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hborla
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Calls to variadic-generic protocol requirements weren't applying substitutions properly, so expansion-sensitive types in the callee signature weren't pairing properly with their expansions in the caller.
emitPackTransform had an over-destroy if the transformation function actually emitted into the temporary element directly.
There were some MV ownership assertions that were wrong, which revealed that the corresponding code really didn't handle consuming/ borrowing mismatches properly at all.
We were completely mishandled consuming packs.
Fixes #81002, #80995, and #81600. 6.2 version of #83555.