Types based on type parameters which have both hasEnhancedNullability
and hasFlexibleNullability were incorrectly converted to IR: only
`@EnhancedNullability` annotation was added to the IR type. This means
that the nullability of the type started to matter, which is incorrect
because the type is supposed to be flexible.
This backfired in the IR fake override builder mode, where nullability
of methods inherited from both Kotlin maps and Java maps clashed, which
resulted in the exception from FakeOverrideRebuilder.
If the type is both flexible and enhanced, we're now adding
`@FlexibleNullability` to the IR type. Note that `@EnhancedNullability`
is not needed because it only affects primitive types which need to be
handled as wrapper types on JVM, but `@FlexibleNullability` already has
that effect.
IR still slightly differs from K1 for collection subclasses, which can
be seen for example in the changed IR text tests. This is to be
investigated later.
The change in tests is needed because the `kt48495*.kt` tests are now
passing on K2 in the IR fake override builder mode, while failing on the
vanilla K2.
This is related to KT-61370 but does not entirely fix it, although
curiously it fixes all remaining tests which were muted because of it.
The tests are removed because JvmDefault is going to be deprecated with
error in KT-54746 and removed later in KT-57696.
Many of the removed tests already had existing counterparts with the new
modes `all` and `all-compatibility`. In this change, I've added such
tests where they were missing, and removed tests which were testing
behavior specific to the JvmDefault annotation, such as some
diagnostics.
#KT-54746
We are going to deprecate `WITH_RUNTIME` directive. The main reason
behind this change is that `WITH_STDLIB` directive better describes
its meaning, specifically it will add kotlin stdlib to test's classpath.
This change is to fill the gap between Kotlin Collection
classes(immutable) and Java Collection classes(mutable), to avoid
calling an unsupported operation like remove() on an immutable class in
jvm.
vladislav.grechko