FILE: main.kt
    package test

    public final class TestClass : R|kotlin/Any| {
        public constructor(): R|test/TestClass| {
            super<R|kotlin/Any|>()
        }

        public final fun test(): R|kotlin/Unit| {
            <Unresolved name: extensionFun>#()
        }

    }
FILE: stdlibExt.kt
    package kotlin

    public final class MyClass : R|kotlin/Any| {
        public constructor(): R|kotlin/MyClass| {
            super<R|kotlin/Any|>()
        }

    }
    public final fun R|kotlin/MyClass|.extensionFun(): R|kotlin/Unit| {
    }