new inference: lambda functional type detection

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/newLambda/FunctionalInterfacesCalculation.java

@@ -0,0 +1,26 @@
+
+import java.util.Optional;
+import java.util.function.Function;
+
+import static java.util.Optional.of;
+
+class MatchTest {
+
+  {
+    Match<String, Integer> match = match((String s) -> s.equals("1") ? of(1) : null, s -> 1);
+  }
+
+  private <M>Optional<M> bar() {
+    return null;
+  }
+
+  public static <T1, V1, W1> Match<T1, V1> match(Extractor<T1, W1> e, Function<W1, V1> c) {
+    return null;
+  }
+
+  class Match<T, V> {}
+
+  interface Extractor<T, W> {
+    Optional<W> unapply(T t);
+  }
+}