They appeared, after the changes in previous commits at
org.jetbrains.kotlin.fir.resolve.transformers.body.resolve.FirExpressionsResolveTransformer#transformDelegatedConstructorCall
The idea is that dispatch receiver is available there in old FE, but additional
diagnostic should be reported on it (see KT-38813)
This change was not made intentionaly but it was the easiest way to
support new tower data elements structure and on the other side it's the
correct behavior as for old FE.
Also, if we once would prefer the previous behavior it's still not very
hard to support it
Before this change:
- Local scopes, implicit receivers and type parameter scopes were separated.
- Static scopes for super classes were not present as a concept.
Instead of them, all-inherited-static for the current class has been used.
- During call resolution we were processing implicit receivers first and then non-local scopes,
while we should process them in the order of their syntax appearance from the closest
to the most distant
All these facts affect semantics (see test data changed here and the following commits)
The architecture changes are the following:
- FirTowerDataElement introduced as tower level that is used in resolution
(effectively it's a union type between scope and implicit receiver + isLocal flag)
- FirTowerDataContext introduced for sake of encapsulation of tower data elements' list
(it also has redundant implicitReceiverStack and localScopes)
- For each regular class we collect relevant tower data elements and add them to the current context
- Also, we preserve a special tower data context for static entities of the class
(it doesn't have class' dispatch receiver and generic parameters)
Unbound it from implicit receiver stack as it only needs scope structure/declaration nestedness
Semantics for protected has been changed in a way it works in old FE
NB: We should report additional diagnostic in case of CallCompanionProtectedNonStatic.fir.kt
(see KT-38814)
In case of IrFunctionReference with type SuspendFunction (no K!) there
was a misalignment between the base class (Any) and the
origin (LAMBDA..). As a result the SuspendFunctionLowering was
getting confused and produced hanging code.
Denis Zharkov