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Illegal class overrides are fundamentally at odds with the way dotty
represents types and therefore can cause lots of low-level problems.
Two measures in this commit
First, we detect direct illegal class overrides on completion instead of
during RefChecks. Break the override by making the previously
overriding type private.
This fixes i1750.scala, but still fails for indirect overrides between
two unrelated outer traits/classes that are inherited by the same class or trait.
We fix this by catching the previously thrown ClassCastException
in both ExtractAPI and RefChecks.
Test case for indirect overrides is in i1750a.scala.
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* Implement flags -Yno-predef and -Yno-imports
* Add unit tests for both
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Previously we returned an empty Reporter with no errors so partest
reported the test as a success.
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When finding two symbols in the same class that have the same signature
as seen from some prefix, issue a merge error.
This is simpler and more robust than the alternative of producing an overloaded
denotation and dealing with it afterwards.
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