fun f() {
}

fun J.test1() {
  <this>.get(k = ::f /*-> @FlexibleNullability Runnable? */)
  <this>.get(k = ::f /*-> @FlexibleNullability Runnable? */, m = ::f /*-> @FlexibleNullability Runnable? */)
}

fun J.test2() {
  <this>.set(k = ::f /*-> @FlexibleNullability Runnable? */, v = ::f /*-> @FlexibleNullability Runnable? */)
  <this>.set(k = ::f /*-> @FlexibleNullability Runnable? */, m = ::f /*-> @FlexibleNullability Runnable? */, v = ::f /*-> @FlexibleNullability Runnable? */)
}

fun J.test3() {
  <this>.plusAssign(i = ::f /*-> @FlexibleNullability Runnable? */)
  <this>.minusAssign(i = ::f /*-> @FlexibleNullability Runnable? */)
}