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Warn when implicit is selected from package prefix under -Xsource:3 #12919

Closed lrytz closed 4 months ago

lrytz commented 6 months ago

In Scala 3 the implicit scope no longer includes package prefixes.

Warn when such an implicit is selected under -Xsource:3migrate and probably stop searching in the prefix with -Xsource:3cross.

Carved out from https://github.com/scala/bug/issues/12886#issuecomment-1821211331