Before this change, we stored the enclosing constructor in a map in
JvmBackendContext before moving lambdas and local classes out of
initializer blocks. However, in case the lambda was declared in an inner
class, we stored a reference to the unlowered constructor of the inner
class, whose JVM signature is "()V" instead of the correct "(LOuter;)V".
Java reflection then threw exception if we tried to call
`getEnclosingConstructor()` on such class at runtime. Proguard finished
with errors for the same reason.
It turns out that we can just store the fact that the class has been
moved, and load the matching constructor in codegen, where everything is
already lowered and guaranteed to match with the signatures of the
actual generated declarations.
#KT-41668 Fixed
There was a typo in JvmLocalClassPopupLowering which allowed the
EnclosingMethod for lambdas and anonymous classes in initializers to
become any function in a class, in case when there was no primary
constructor in that class. E.g. in the added test, `getIrrelevantField`
was the EnclosingMethod of the lambda class before this change.
In box tests, only check that Java reflection does not crash on the
EnclosingMethod attribute generated in these classes. If it doesn't
crash, most likely it returns the value that can be read from the class
file by ASM, which is what the newly added bytecode listing tests are
checking now.
Artem Kobzar