[NI] Coerce to Unit expression in last block with explicit Unit

#KT-32037 Fixed

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

@@ -0,0 +1,13 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+fun coerceToUnit(f: () -> Unit) {}
+
+class Inv<T>
+
+fun <K> builder(block: Inv<K>.() -> Unit): K = TODO()
+
+fun test() {
+    coerceToUnit {
+        builder {}
+    }
+}