[NI] Revise variance calculation method for completion mode

Before fix only one level of type arguments was used to determine variance of type variable to find out direction requirements. This incorrect in general case, because outer variance affects subtyping deductions, for example: Inv<Out<A>> <: Inv<Out<B>> => A <: B; B <: A, despite A and B are in covariant position if only one level is considered ^KT-36233 Fixed
2020-01-30 19:06:21 +03:00
parent e27b2990e3
commit 517688e163
22 changed files with 904 additions and 39 deletions
@@ -0,0 +1,78 @@
+// !LANGUAGE: +NewInference
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+interface Base
+class Derived : Base
+class OtherDerived : Base
+
+class Inv<T>
+class Out<out O>
+class In<in I>
+
+class BiParam<out F, out S>
+
+fun <K> id(arg: K) = arg
+
+fun <D> createDoubleIn(arg: D): In<In<D>> = TODO()
+fun <D> createDoubleInOut1(arg: D): In<In<Out<D>>> = TODO()
+fun <D> createDoubleInOut2(arg: D): In<Out<In<D>>> = TODO()
+fun <D> createDoubleInOut3(arg: D): Out<In<In<D>>> = TODO()
+
+fun <D> createInOut(arg: D): In<Out<D>> = TODO()
+fun <D> createOutIn(arg: D): Out<In<D>> = TODO()
+fun <D> createInvOut(arg: D): Inv<Out<D>> = TODO()
+fun <D> createOutInvDoubleIn(arg: D): Out<Inv<In<In<D>>>> = TODO()
+
+fun <F, S> biparamEarly(first: F, second: S): BiParam<In<In<F>>, Out<S>> = TODO()
+fun <F, S> biparamEarlyIrrelevantInv(first: F, second: S): BiParam<In<In<F>>, Inv<String>> = TODO()
+fun <F, S> biparamEarlyStarProjection(first: F, second: S): BiParam<*, In<In<S>>> = TODO()
+
+fun <F, S> biparamLateIn(first: F, second: S): BiParam<In<Out<F>>, S> = TODO()
+fun <F, S> biparamLateInv(first: F, second: S): BiParam<Inv<Out<F>>, S> = TODO()
+
+fun <T> take(biParam: BiParam<*, In<In<T>>>) {}
+
+fun testEarlyCompletion(derived: Derived, otherDerived: OtherDerived) {
+    id<In<In<Base>>>(
+        <!DEBUG_INFO_EXPRESSION_TYPE("In<In<Derived>>")!>createDoubleIn(derived)<!>
+    )
+    id<In<In<Out<Base>>>>(
+        <!DEBUG_INFO_EXPRESSION_TYPE("In<In<Out<Derived>>>")!>createDoubleInOut1(derived)<!>
+    )
+    id<In<Out<In<Base>>>>(
+        <!DEBUG_INFO_EXPRESSION_TYPE("In<Out<In<Derived>>>")!>createDoubleInOut2(derived)<!>
+    )
+    id<Out<In<In<Base>>>>(
+        <!DEBUG_INFO_EXPRESSION_TYPE("Out<In<In<Derived>>>")!>createDoubleInOut3(derived)<!>
+    )
+    id<BiParam<In<In<Base>>, Out<Base>>>(
+        <!DEBUG_INFO_EXPRESSION_TYPE("BiParam<In<In<Derived>>, Out<OtherDerived>>")!>biparamEarly(derived, otherDerived)<!>
+    )
+    id<BiParam<In<In<Base>>, Inv<String>>>(
+        <!DEBUG_INFO_EXPRESSION_TYPE("BiParam<In<In<Derived>>, Inv<kotlin.String>>")!>biparamEarlyIrrelevantInv(derived, otherDerived)<!>
+    )
+    take<Base>(
+        <!DEBUG_INFO_EXPRESSION_TYPE("BiParam<*, In<In<OtherDerived>>>")!>biparamEarlyStarProjection(derived, otherDerived)<!>
+    )
+}
+
+fun testLateCompletion(derived: Derived, otherDerived: OtherDerived) {
+    id<In<Out<Base>>>(
+        <!DEBUG_INFO_EXPRESSION_TYPE("In<Out<Base>>")!>createInOut(derived)<!>
+    )
+    id<Out<In<Base>>>(
+        <!DEBUG_INFO_EXPRESSION_TYPE("Out<In<Base>>")!>createOutIn(derived)<!>
+    )
+    id<Inv<Out<Base>>>(
+        <!DEBUG_INFO_EXPRESSION_TYPE("Inv<Out<Base>>")!>createInvOut(derived)<!>
+    )
+    id<Out<Inv<In<In<Base>>>>>(
+        <!DEBUG_INFO_EXPRESSION_TYPE("Out<Inv<In<In<Base>>>>")!>createOutInvDoubleIn(derived)<!>
+    )
+    id<BiParam<In<Out<Base>>, OtherDerived>>(
+        <!DEBUG_INFO_EXPRESSION_TYPE("BiParam<In<Out<Base>>, OtherDerived>")!>biparamLateIn(derived, otherDerived)<!>
+    )
+    id<BiParam<Inv<Out<Base>>, OtherDerived>>(
+        <!DEBUG_INFO_EXPRESSION_TYPE("BiParam<Inv<Out<Base>>, OtherDerived>")!>biparamLateInv(derived, otherDerived)<!>
+    )
+}