Backport "Revert "Drop redundant butNot = Param clause in isAnchor"" to LTS
#22127
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This reverts commit 9d88c80. Closes #21521 The `ClassTypeParamCreationFlags` include both `TypeParam` and `Deferred`. In effect, a class type parameter was incorrectly considered as an anchor. For a failing example, one can try asserting: ```scala || sym.is(Deferred).ensuring(_ == sym.is(Deferred, butNot = Param)) ``` in `ImplicitRunInfo#isAnchor` and a test with `summon[Ordering[Int]]`. In that example, at least, the flags happen to be set by `Scala2Unpickler#readDisambiguatedSymbol` src/dotty/tools/dotc/core/unpickleScala2/Scala2Unpickler.scala:562. [Cherry-picked 1b1dd16][modified]
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No regressions detected in the community build up to backport-lts-3.3-21857. |
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Backports #21566 to the 3.3.5.
PR submitted by the release tooling.
[skip ci]