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kotlin-fork/compiler/testData/codegen/box/when/enumOptimization/kt14597.kt
T
Nikolay Lunyak a9343aeb7d [FIR] KT-55840: Ensure everything actually works
This inconsistency is present due to not using the `// WITH_STDLIB`
in the above tests. When K1 creates the enum, it tries to generate
`entries()`, and for that it tries to load `kotlin.enums.EnumEntries`,
but this is actually an unresolved reference. K1 silently swallows it,
and proceeds.

The reason K2 doesn't fail is that in order to generate `entries()` it
simply creates the necessary `ConeClassLikeType` with the desired
`classId` instead of loading the whole `ClassDescriptor`.

The reason we can still observe `$ENTRIES` and `$entries` in K1
is because they are generated during the JVM codegen, and it
only checks if the `EnumEntries` language feature is supported. It
doesn't check if the `entries` property has really existed in IR
(by this time it's expected to have already been lowered to the
`get-entries` function - that's why "has ... existed").

The reason why the codegen doesn't fail when working with
`kotlin.enums.EnumEntries` is because it creates its
own `IrClassSymbol`.

^KT-55840 Fixed

Merge-request: KT-MR-8727
Merged-by: Nikolay Lunyak <Nikolay.Lunyak@jetbrains.com>
2023-02-10 16:57:51 +00:00

26 lines
484 B
Kotlin
Vendored

// WITH_STDLIB
// CHECK_CASES_COUNT: function=box count=6
// CHECK_IF_COUNT: function=box count=1
enum class En { A, B, C }
fun box(): String {
var res = ""
// nullable variable
val en2: Any? = En.A
if (en2 is En) {
when (en2) {
En.A -> {res += "O"}
En.B -> {}
En.C -> {}
}
when (en2 as En) {
En.A -> {res += "K"}
En.B -> {}
En.C -> {}
}
}
return res
}