In K1 (see LazyImportScope), default start import with different
priority worked as follows:
- if something is found in HIGH, don't look at LOW
- otherwise, look at LOW
That, in particular, helped to avoid looking into JDK mirroring classes'
constructors like when resolving calls like String(...) because we
just don't look into j.l.String while already found kotlin.String
The change inside FirTowerResolveTask.kt is not made accidentally:
- At first, it's more or less obviously a bug fix because tower group
for hide-members candidate with implicit receiver should take into
account the tower level of the receiver itself.
- The change is attached to this commit because otherwise the test
at compiler/testData/diagnostics/testsWithStdLib/kt55503.kt starts
failing.
The bug was hidden because previously after finding a successful
`Sequence.forEach` candidate for the inner receiver
(at the default HIGH star import scope), resolver was continuing to
look into default LOW star import scope where it's frozen forever because
we had the better/closer candidate anyway.
But after this change with merging default star imports into the same
tower leve, resolver was continuing its job, enumerating implicit
receivers, finding List<Int> there and noticing that there's
a TopPrioritized hide-member candidates for them
(erroneously ignoring it has a worse/more far receiver).
^KT-51670 Fixed
Before this commit, we added Enum.entries only in case when
LanguageFeature.EnumEntries was ON (with an exception in K1/Java case).
In this commit we add Enum.entries unconditionally, and in case
the language feature is OFF we filter them out during tower resolve.
That issue might be fixed via changing
TypeVariableMarker.shouldBeFlexible at ConeConstraintSystemUtilContext
but this and some other tricks have been added because of incorrect
handling of constraints where type variable has a flexible bound
^KT-51168 Fixed
Before this commit we took just first intersection member for this check.
However it's quite bad, because we were dependent on supertype order.
Choosing the most specific member looks more consistent here.
#KT-50969 Fixed
This commit fixes DFA problem (see test) when we accidentally try
to merge incoming flows from member property (val ... by cached ...) and
the following function. While completing lambda of buildList { ... }
inside by cached we accidentally assume that delegate is already left
and add the lambda into exitsFromCompletedPostponedAnonymousFunction.
This commit fixes the problem by exiting delegate later, after completion.
Consider the following code:
```
fun test(a: List<String>) {
a.first()
}
```
The dispatch receiver type of `first` in this case is `List<T>` before
this change. After this change, it's `List<String>`.
In addition, this change also replace the dispatch receiver type with
the more specific type if available. For example, consider the following
```
class MyList: ArrayList<String>()
fun test(a: MyList) {
a.get(0)
}
```
The dispatch receiver type of `get` is `MyList`, instead of
`ArrayList<String>`. That is, a fake override is created in this case.
Denis.Zharkov