In K1, we have the rules like:
- if there's explicit type of a property, then use it
- if there's an initializer, obtain its expression-type
- Otherwise, use getter's return type
The case when getter's type is implicit is handled at
FirDeclarationsResolveTransformer.transformProperty
^KT-56707 Fixed
It's been introduced in the previous commit
("K2: Simplify handling mixed smartcast vs. original candidates")
Because previously, it was assumed wrongly that each next level of
ConeCallConflictResolver filter out the candidates that are 100% less
applicable/specific, but the main one (ConeOverloadConflictResolver)
either leaves the single candidate or the whole same set, thus at
FilteringOutOriginalInPresenceOfSmartCastConeCallConflictResolver
we've got 4 candidates only two of which we might filter out.
There's no real need in binding overrides for smartcast/original members
after FilteringOutOriginalInPresenceOfSmartCastConeCallConflictResolver
Instead, we just create candidates for all of them and filter out after
the ones that came from original type (if needed)
The idea is that when we have successful candidates both from smart cast
and original type, we should discriminate in the favor of former ones.
While this problem (see kt55722.kt) existed before this branch is merged,
initially it was recognized on FP Ultimate when we stopped assuming
captured types from the same projections as equal (see kt55722Initial.kt).
^KT-55722 Fixed
^KT-55024 Fixed
^KT-56283 Related
^KT-56310 Related
The job is already done at CheckExtensionReceiver resolution stage
And repeating it might only lead to incorrect errors caused by
double-capture of receiver type that leads to contradiction because
in previous commit we started assuming different capture instantiations
as different types.
Otherwise, it leads to branches inference run fully independent,
while there are cases when it's necessary to flow type information from
one of the branch to another (see the new test).
NB. In K1, it worked differently: if branches were inferred altogether
only for Any/Any? expect types (otherwise they're analyzed independently)
See foo2/foo4 in the test.
To avoid breaking change we need to support foo1/foo3, but we're trying
not to have some special rule for Any, so we've got a new resolution mode
that provides expect type, but doesn't require full completion.
^KT-45989 Fixed
^KT-56563 Fixed
^KT-54709 Related
For change in specialCallWithMaterializeAndExpectedType.kt
At first, see at KT-36776
Long time ago, it's been decided that if/when resolution
should look similar to similar "select()" calls,
but it's a breaking change (see KT-36776), and we were ready for that back then.
But then, there were too many broken cases found, thus we reverted it at
100a6f70ca
But probably, it would be better to try to infer `String?`
instead of `Nothing?` (see next commits)
Note that change in specialCallWithMaterializeAndExpectedType.kt
will be addressed in later commits, too
Implicit type might have two meaning there:
- noExpectedType
- unknown declaration type where this expression is assigned to
For both cases, we've got ResolutionMode.ContextIndependent that works
just fine
When expected type is known, use it as expected type for branch bodies.
While it indeed becomes different from the usual select call resolution,
where expected type is applied only after completion starts,
it helps to support, e.g. callable references resolution just as powerful
as it was in K1.
Also, in some cases where diagnostics have been changed, they become
a bit more helpful since they are reported closer
to the problematic places
cannotCastToFunction.kt test has been removed because it relied
on the case erroneously supported by the hack removed from
the FirCallResolver in this commit.
^KT-45989 Fixed
^KT-55936 Fixed
^KT-56445 Fixed
^KT-54709 Related
^KT-55931 Related
Beside some corner cases, it's already prohibited in K1 because
adaptation have a bit strange nature
(they don't represent any existing real function exactly)
^KT-55137 Fixed
Some of the changed tests may duplicate other existing diagnostics,
but that should not be reason not to report them at all.
There might be another job to be done to avoid diagnostic duplications
For example, NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER
It became especially relevant after 0e84bf2053
that together with later commits bring a lot of unnecessary
NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER diagnostic
This flag is true by default but is set to false for
- Java methods and constructors
- interface delegation methods that delegate to Java
The NAMED_ARGUMENTS_NOT_ALLOWED logic is mostly refactored to use the
new flag though some custom logic remains for determining the correct
message and to work around a corner case with fake overrides.
The flag is (de)serialized from/to metadata. For backward compatibility
with K1, delegated methods to Java types are deserialized as stable.
^KT-40480 Fixed
Passing `EXTENSION_RECEIVER` when processing `noReceiver`
looks like a mistake in general. This change is backed
by the `hidesMembers` and
`memberWithHidesMemberAnnotationVsMemberWithout` tests.
The exact reason with `memberWithHidesMemberAnnotationVsMemberWithout`
is that it first checks `@HidesMembers` candidates,
only takes the `kotlin/collections/Iterable<T>.forEach`,
but then yields `InapplicableWrongReceiver`,
because `explicitReceiverKind = EXTENSION_RECEIVER`
(which is strange, because we really don't have an explicit receiver).
Then we visit the same scope once more (now for all candidates)
and take 2 functions:
- `kotlin/collections/Iterable<T>.forEach`
- `kotlin/sequence/Sequence<T>.forEach`
...and they both result in `RESOLVED`,
because this time `explicitReceiverKind = NO_EXPLICIT_RECEIVER`.
This change ensures the first candidate we see
while checking `@HidesMembers` is taken as `RESOLVED`.
^KT-55503 Fixed
Denis.Zharkov