OUT:
Buildfile: [TestData]/build.xml

build:
  [kotlinc] Compiling [[TestData]/main.kt] => [[Temp]/hello.jar]
  [kotlinc] warning: language version 1.5 is deprecated and its support will be removed in a future version of Kotlin
  [kotlinc] [TestData]/main.kt:1:15: error: suspend function type is allowed as a supertype only since version 1.6
  [kotlinc] interface A : suspend () -> Unit
  [kotlinc]               ^^^^^^^^^^^^^^^^^^

ERR:

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

Total time: [time]

Return code: 1