If I have a common library which targets the `AutoCloseable` experimental stdlib API, is there a way...

# multiplatform

[Kyle Wood]

If I have a common library which targets the AutoCloseable experimental stdlib API, is there a way to make it also work for JVM? I get a type mismatch error when trying to use a Java AutoCloseable with my library

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-auto-closeable/

[Jeff Lockhart]

AutoCloseable is an expect class in Kotlin common and its JVM actual is the Java implementation. If you're getting an error, it's likely a false positive in the IDE.

[Kyle Wood]

Yup, you're right. It builds and the test executes fine, it's an IDE error

[Jeff Lockhart]

I use AutoCloseable in my KMP library and in some cases it works as expected, while in other cases, I get this error in the IDE for the JVM actual class:

Actual class 'SomeClass' has no corresponding expected declaration

The following declaration is incompatible because some supertypes are missing in the actual declaration:

@OptIn public final expect class SomeClass : AutoCloseable defined in somepackage in file SomeClass.kt

It's odd because it's pretty much the same scenario as others that don't display an error in the IDE, an expect class that implements AutoCloseable.

[Kyle Wood]

I'll open an issue on youtrack about it, hopefully my particular issue is simple enough to be fixed, I haven't run into that one yet though

[Jeff Lockhart]

Great. I'll add my error to the issue. I haven't created one for this yet.

[Kyle Wood]

Alright cool - I'll push up my reproduction example to a git repo and create the issue, I'll drop the link in here once I've done that

[Kyle Wood]

https://youtrack.jetbrains.com/issue/KTIJ-27794/Type-mismatch-error-when-using-common-kotlin.AutoCloseable-libraries-with-java.lang.AutoCloseable