K2: Fix false-positive on delegated constructor call of outer class
See callingOuterGenericClassConstructorWithSelfTypes.kt
Previously, for A<B>(""), we used substituted constructor
where `X` was substituted with `B` (or `A<X>.B`).
But when resolving the call for constructor, we use `X`
as a type variable of the call, thus in some positions
we used `X` as TV (Xv in the comments) and somewhere `X` as a type
parameter, thus leading to contradictions (see clarifying comment).
The idea of the fix is simply repeating of the regular (not delegated)
constructor call resolution:
- We substitute only type parameters of outer class
- All the declared parameters of the callee are being checked
through regular resolution & inference mechanisms.
NB: Diagnostic only being reported on arguments because there
when we add `String <: Any` constraint it fails due to existing
contradiction in the CS.
Without the argument/parameter the error is just being lost, but that's
a different story (seeKT-65224).
^KT-64841 Fixed
This commit is contained in:
committed by
Space Team
parent
81d559ad7f
commit
7b82ca8b6f
Vendored
-21
@@ -1,21 +0,0 @@
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// ISSUE: KT-64841
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open class A<X : A<X>>(a: Any?) {
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// Constraints while resolving super constructor call
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//
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// The signature of constructor comes substituted
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// constructor<X : R|A<A.B<X>>|>(a: R|kotlin/Any?|): R|A<A.B<X>>|
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//
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// Xv <: A<A<Xv>.B> (from type parameter bounds, actually it's the incorrect place)
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//
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// Xv := A<X>.B (from explicit type argument of constructor call)
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// A<X>.B> <: A<A<Xv>.B>
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// A<A<X>.B> <: A<A<Xv>.B>
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// Xv := X
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// X != A<X>.B -> FAIL
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inner class B : A<B>(<!ARGUMENT_TYPE_MISMATCH!>""<!>) {
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fun foo() {
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A<B>("")
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}
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}
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}
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Vendored
+1
@@ -1,3 +1,4 @@
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// FIR_IDENTICAL
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// ISSUE: KT-64841
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open class A<X : A<X>>(a: Any?) {
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-6
@@ -1,6 +0,0 @@
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// ISSUE: KT-64841
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abstract class A<X, Y : A<X, Y>>
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abstract class B<X, T, Y : B<X, T, Y>>(delegate: A<X, *>) : A<X, Y>() {
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inner class C<R> : B<X, R, C<R>>(<!ARGUMENT_TYPE_MISMATCH!>this<!>)
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}
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compiler/testData/diagnostics/tests/inner/callingOuterGenericClassConstructorWithSelfTypesInitial.kt
Vendored
+1
@@ -1,3 +1,4 @@
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// FIR_IDENTICAL
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// ISSUE: KT-64841
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abstract class A<X, Y : A<X, Y>>
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