/kt47986_3.kt:4:18: warning: parameter 'builderAction' is never used
fun <K> buildFoo(builderAction: Foo<K>.() -> Unit): Foo<K> = Foo()
                 ^
/kt47986_3.kt:6:26: warning: parameter 'x' is never used
fun <K: N, N> Foo<K>.bar(x: Int = 1) {}
                         ^
/kt47986_3.kt:9:9: warning: variable 'x' is never used
    val x = buildFoo {
        ^
/kt47986_3.kt:9:13: warning: type parameter for a type argument K can't be inferred into declared upper bounds. Please provide any use-site type information. It will become an error in future releases.
    val x = buildFoo {
            ^

