This looked like a small and useful change, but caused so many issues
(KT-24474, KT-24790, 30b9caea, and another unreported one -- see the
test update in this commit) that it didn't pay off after all. The
optimization is not that critical for now, as it's only relevant for
data classes where component types have trivial equals/hashCode
implementation, which is not very often
#KT-12330 Declined
Synthesized 'copy' introduces default values for parameters, which is
prohibited for regular overrides.
Report warning in language version 1.2-, error in 1.3+.
This patch mutes the following test categories:
* Tests with java dependencies (System class,
java stdlib, jvm-oriented annotations etc).
* Coroutines tests.
* Reflection tests.
* Tests with an inheritance from the standard
collections.
- change prerequisites for generating equals/hashCode/toString in a data class:
previously they were generated if the corresponding method is trivial (i.e.
it comes from kotlin.Any), now we're generating it always unless it'll cause
a JVM signature clash error (see KT-6206)
- use static KotlinBuiltIns.isXxx methods to compare types instead of checking
against descriptors loaded from certain built-ins instance, this is quicker
and more correct in environments where several built-ins are possible
- don't use isOrOverridesSynthesized, it's not relevant for
equals/hashCode/toString because functions with these names are never
synthesized
#KT-6206 Fixed
