K2: report empty intersection warnings from completion properly

compiler/testData/diagnostics/tests/inference/coercionToUnit/afterBareReturn.fir.kt

@@ -1,41 +0,0 @@
-interface I
-open class C
-
-fun completed(): String = "..."
-
-fun <T> incomplete(): T = null!!
-
-fun <T : I> incompatibleI(): T = null!!
-fun <T : C> incompatibleC(): T = null!!
-
-val p = false
-
-fun expectUnit(x: Unit) = x
-
-fun test1() = run {
-    if (p) return@run
-    completed() // ok, not returned
-}
-
-fun test2() = run {
-    if (p) return@run
-    incomplete() // ? either uninferred T or Unit
-}
-
-fun test3() = run {
-    if (p) return@run
-    incompatibleI() // ? either uninferred T or error (Unit </: I)
-}
-
-fun test4() = <!INFERRED_TYPE_VARIABLE_INTO_EMPTY_INTERSECTION_WARNING!>run<!> {
-    if (p) return@run
-    incompatibleC() // ? either uninferred T or error (Unit </: C)
-}
-
-fun main() {
-    // all ok
-    expectUnit(test1())
-    expectUnit(test2())
-    expectUnit(test3())
-    expectUnit(test4())
-}

compiler/testData/diagnostics/tests/inference/coercionToUnit/afterBareReturn.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 interface I
 open class C