The problem appeared because not all of the `realOverridden` have been
collected because inside AbstractSerializableListDecorator some of the
scopes returned the same instance as direct overridden and after that
overridden tree traversal stopped without detecting real overrides.
Thus, the modality of intersection for
AbstractSerializableListDecorator::size and MutableSet::size
was incorrectly computed to ABSTRACT
The similar thing is already done at the place where we're obtaining
all overrides.
See https://github.com/JetBrains/kotlin/commit/c80cfb0fdb00323ba9b5e1dd98c5cbd0bfab6b8b#diff-182d90c9b8050557e4e2eb319a84b9a51fd0600c728dd0fce85cf6491c13e16dR152
^KT-57693 Fixed
* Change 1.6 to 1.7 constants
* Fix SAFE_CALL_WILL_CHANGE_NULLABILITY for testData
* Change EXPOSED_PROPERTY_TYPE_IN_CONSTRUCTOR_WARNING to EXPOSED_PROPERTY_TYPE_IN_CONSTRUCTOR_ERROR
* Change NON_EXHAUSTIVE_WHEN_STATEMENT to NO_ELSE_IN_WHEN
* Fix testData for SafeCallsAreAlwaysNullable
* Change T -> T & Any in test dumps
* Change INVALID_CHARACTERS_NATIVE_WARNING -> INVALID_CHARACTERS_NATIVE_ERROR
* TYPECHECKER_HAS_RUN_INTO_RECURSIVE_PROBLEM_WARNING -> TYPECHECKER_HAS_RUN_INTO_RECURSIVE_PROBLEM_ERROR
Denis.Zharkov