Backport "Three fixes to SAM type handling" to LTS #22132
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WojciechMazur
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The first two fixes concern characterization of SAM types. One condition of a SAM type is that it can be instantiated with an empty argument list. This was implemented incorrectly. First, we missed the case where the SAM type is a trait with a parent class that takes arguments. In this case the SAM type _cannot_ be instantiated with an empty argument list. Second, we missed the case where the SAM type constructor has a single vararg parameter. In this case the SAM type _can_ be instantiated with an empty argument list. The second case was also translated incorrectly which led to illegal bytecodes. Fixes #15855 [Cherry-picked f0b6763]
Fix SAM test to use the same scheme as SAM expansion to determine whether a type needs zero arguments for construction. [Cherry-picked 8aa59f8][modified]
[Cherry-picked 3af67ba][modified]
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No regressions detected in the community build up to backport-lts-3.3-21857. |
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Backports #21596 to the 3.3.5.
PR submitted by the release tooling.
[skip ci]