Only set AppliedType#validSuper after AppliedType#cachedSuper
#20553
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since cycles are possible when computing `AppliedType#superType`, see tests/neg/i20546.scala for an example leading to an NPE. We could use `ctx.period == validSuper && cachedSuper == null` as condition to detect cycles, but they are already handled in `TypeApplications#appliedTo`, with a better error message. We can update `AppliedType#validSuper` only after the computation is done to fix scala#20546
dwijnand
approved these changes
Jun 11, 2024
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I should probably have added this as a comment in the test, I'm not particularly convinced this has to by a cyclic error, but at least we don't have a NPE and it's no longer a regression. |
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since cycles are possible when computing
AppliedType#superType, see tests/neg/i20546.scala for an example leading to an NPE.We could use
ctx.period == validSuper && cachedSuper == nullas condition to detect cycles, but they are already handled inTypeApplications#appliedTo, with a better error message.We can update
AppliedType#validSuperonly after the computation is done to fix #20546