Pavel Kirpichenkov
dc42b20ae3
The new inference uses inferred intersection types normally, unlike the old inference.
However, intersection types in public declarations are approximated to supertype, which
potentially may give a less presice type, then it would be with the OI.
For non-related T1, T2 the NI approximates {T1 & T2} to Any in public declarations,
and if the OI was inferring T1 instead of the intersection type, it may lead to
less precise declaration type and related errors.
The solution is to remember an alternative for an intersection type when present.
Before approximation the alternative replaces the intersection type.
^KT-36249 Fixed
55 lines
3.1 KiB
Kotlin
Vendored
55 lines
3.1 KiB
Kotlin
Vendored
// !DIAGNOSTICS: -UNUSED_PARAMETER
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fun test(first: First, second: Second) {
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<!DEBUG_INFO_EXPRESSION_TYPE("Inv<Inv<Bound1>>")!>test1(first, second)<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("Inv<In<Bound1>>")!>test2(first, second)<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("Inv<Out<Bound1>>")!>test3(first, second)<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("In<Inv<Bound1>>")!>test4(first, second)<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("In<In<Bound1>>")!>test5(first, second)<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("In<Out<Bound1>>")!>test6(first, second)<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("Out<Inv<Bound1>>")!>test7(first, second)<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("Out<In<Bound1>>")!>test8(first, second)<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("Out<Out<Bound1>>")!>test9(first, second)<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("Out<Out<Out<Bound1>>>")!>test10(first, second)<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("Inv<Out<Out<Bound1>>>")!>test11(first, second)<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("Inv<Out<In<Bound1>>>")!>test12(first, second)<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("Inv<In<Out<Bound1>>>")!>test13(first, second)<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("Inv<In<In<Bound1>>>")!>test14(first, second)<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("Out<Inv<Out<Bound1>>>")!>test15(first, second)<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("Out<Out<In<Bound1>>>")!>test16(first, second)<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("Out<In<Out<Bound1>>>")!>test17(first, second)<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("In<Out<Out<Bound1>>>")!>test18(first, second)<!>
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}
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interface Bound1
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interface Bound2
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object First : Bound1, Bound2
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object Second : Bound1, Bound2
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fun <S : Bound1> intersect(vararg elements: S): S = TODO()
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class Inv<T>(val prop: T)
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class In<in I>(arg: I)
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class Out<out O>(val arg: O)
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fun test1(first: First, second: Second) = Inv(Inv(intersect(first, second)))
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fun test2(first: First, second: Second) = Inv(In(intersect(first, second)))
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fun test3(first: First, second: Second) = Inv(Out(intersect(first, second)))
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fun test4(first: First, second: Second) = In(Inv(intersect(first, second)))
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fun test5(first: First, second: Second) = In(In(intersect(first, second)))
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fun test6(first: First, second: Second) = In(Out(intersect(first, second)))
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fun test7(first: First, second: Second) = Out(Inv(intersect(first, second)))
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fun test8(first: First, second: Second) = Out(In(intersect(first, second)))
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fun test9(first: First, second: Second) = Out(Out(intersect(first, second)))
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fun test10(first: First, second: Second) = Out(Out(Out(intersect(first, second))))
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fun test11(first: First, second: Second) = Inv(Out(Out(intersect(first, second))))
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fun test12(first: First, second: Second) = Inv(Out(In(intersect(first, second))))
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fun test13(first: First, second: Second) = Inv(In(Out(intersect(first, second))))
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fun test14(first: First, second: Second) = Inv(In(In(intersect(first, second))))
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fun test15(first: First, second: Second) = Out(Inv(Out(intersect(first, second))))
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fun test16(first: First, second: Second) = Out(Out(In(intersect(first, second))))
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fun test17(first: First, second: Second) = Out(In(Out(intersect(first, second))))
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fun test18(first: First, second: Second) = In(Out(Out(intersect(first, second))))
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