Unless the compatibility option "-Xsingle-module" is passed, the compiler will
create two modules instead of one now (see TopDownAnalyzerFacadeForJVM): the
main module contains Kotlin and Java sources and binaries from the previous
compilation of the given module chunk, the dependency module contains all other
Kotlin and Java binaries. This fixes some issues where the compiler couldn't
detect that the used symbol was from another module, and did not forbid some
usages which are only possible inside the module (see KT-10001).
The ideal way to deal with modules here would be to exactly recreate the
project structure, for example as it's done in JvmAnalyzerFacade and usages.
This is postponed until later
#KT-10001 Fixed
#KT-11840 In Progress
The main change is in FunctionsTypingVisitor#visitLambdaExpression, where we
incorrectly allowed subtypes of function types to be expected type during
resolution of lambdas
Also see EA-70485
#KT-9820 Fixed
Mikhail Zarechenskiy