new inference: collect nested calls from lambda return statements (JDK-8038747)

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

@@ -0,0 +1,59 @@
+import java.util.Arrays;
+import java.util.List;
+import java.util.function.BiFunction;
+import java.util.function.Function;
+import java.util.stream.Stream;
+
+abstract class Play {
+  public void main(Stream<String> stream, Stream<String> anotherStream) {
+    Stream<String> stringStream = stream.map(o -> foo(i -> "")).flatMap(l -> l);
+  }
+
+  abstract <RF > Stream<RF> foo(Function<Integer, ? extends RF> mapper);
+
+  static int foo() {
+    return 6;
+  }
+}
+
+
+
+class SimplePlay {
+  {
+    foo(y -> bar(x ->  "")).substring(0);
+  }
+
+  interface Res<R> {
+    R apply(String s);
+  }
+
+  <T> T foo(Res<T> f) {return null;}
+  <K> K bar(Res<K> f) {return null;}
+}
+
+class Test19 {
+  interface Seq<E> extends Iterable<E> {
+    static <E> Seq<E> of(Iterable<? extends E> source) {
+      return null;
+    }
+
+    <R> Seq<R> map(Function<? super E, ? extends R> mapper);
+    <R, V> Seq<R> zip(BiFunction<? super E, ? super V, ? extends R> zipper, Seq<V> other);
+  }
+
+  interface S extends Seq<String> {
+    static S copyOf(Iterable<String> source) {
+      return null;
+    }
+  }
+
+  interface D extends S {
+
+  }
+
+  void test(Seq<D> dseq) {
+    BiFunction<D, List<Integer>, Seq<S>> f =
+      (d, nums) -> dseq.map(s -> s.zip((text, num) -> text + num, Seq.of(nums)))
+        .map(s -> S.copyOf(s));
+  }
+}