warning: ATTENTION! This build uses unsafe internal compiler arguments: -XXLanguage:+MultiPlatformProjects This mode is not recommended for production use, as no stability/compatibility guarantees are given on compiler or generated code. Use it at your own risk! warning: -Xfragments flag is not supported for language version < 2.0 compiler/testData/cli/jvm/hmpp/src/a.kt:1:1: warning: 'expect'/'actual' classes (including interfaces, objects, annotations, enums, and 'actual' typealiases) are in Beta. You can use -Xexpect-actual-classes flag to suppress this warning. Also see: https://youtrack.jetbrains.com/issue/KT-61573 expect class A { ^^^^^^ compiler/testData/cli/jvm/hmpp/src/a.kt:5:1: warning: 'expect'/'actual' classes (including interfaces, objects, annotations, enums, and 'actual' typealiases) are in Beta. You can use -Xexpect-actual-classes flag to suppress this warning. Also see: https://youtrack.jetbrains.com/issue/KT-61573 expect class B { ^^^^^^ compiler/testData/cli/jvm/hmpp/src/b.kt:1:1: warning: 'expect'/'actual' classes (including interfaces, objects, annotations, enums, and 'actual' typealiases) are in Beta. You can use -Xexpect-actual-classes flag to suppress this warning. Also see: https://youtrack.jetbrains.com/issue/KT-61573 actual class A { ^^^^^^ compiler/testData/cli/jvm/hmpp/src/c.kt:1:1: warning: 'expect'/'actual' classes (including interfaces, objects, annotations, enums, and 'actual' typealiases) are in Beta. You can use -Xexpect-actual-classes flag to suppress this warning. Also see: https://youtrack.jetbrains.com/issue/KT-61573 actual class B { ^^^^^^ OK