- The cause for KTIJ-24206 is that the `expect` function's parent is an
`IrFile` instead of an `IrClass`. This is because
`ExpectDeclarationsRemoveLowering` removes `expect` declarations
before `FileClassLowering` can replace `IrFile` parents.
- That behavior is normally okay, but breaks down when an `expect`
declaration has no associated `actual` declaration. In such cases,
`ExpectDeclarationsRemoveLowering` doesn't replace `expect` symbols in
expressions with their corresponding `actual` symbols, as it normally
would.
- The solution fills in `ExpectDeclarationsRemoveLowering`'s behavior
by replacing `expect` symbols for which no `actual` symbols exist with
stubs. See `stubOrphanedExpectSymbols`.
- To not mess with the lowerings, `stubOrphanedExpectSymbols` is invoked
during IR generation. It uses the same `ExpectSymbolTransformer`
as `ExpectDeclarationRemover`.
^KTIJ-24206 fixed
Marco Pennekamp
c9461a3827