OUT:
Buildfile: [TestData]/build.xml

build:
  [kotlinc] Compiling [[TestData]/main.kt] => [[Temp]/hello.jar]
  [kotlinc] [TestData]/main.kt:3:17: error: this type is sealed, so it can be inherited by only its own nested classes or objects
  [kotlinc] class Derived : Base()
  [kotlinc]                 ^

ERR:

BUILD FAILED
[TestData]/build.xml:5: Compile failed; see the compiler error output for details.

Total time: [time]

Return code: 1