I occasionally get this error when trying to run scratch files:

Back-end (JVM) Internal error: Failed to generate expression: KtCallExpression
File being compiled: (11,37) in /tmp.kt
The root cause java.lang.IllegalStateException was thrown at: org.jetbrains.kotlin.codegen.state.KotlinTypeMapper$Companion.getPackageMemberContainingClassesInfo(KotlinTypeMapper.kt:1378)

and restarts and such don't seem to help

If you manage to reproduce it, the correct place to report it is there → https://kotl.in/issue