StreamToLoopInspection: support inside single-expression lambdas

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamToLoop/afterInLambda.java

@@ -0,0 +1,27 @@
+// "Replace Stream API chain with loop" "true"
+
+import java.util.Objects;
+import java.util.function.DoubleSupplier;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class Main {
+  public void test(String... list) {
+    DoubleSupplier s = () -> {
+        long sum = 0;
+        long count = 0;
+        for (String s1 : list) {
+            if (Objects.nonNull(s1)) {
+                sum += s1.length();
+                count++;
+            }
+        }
+        return (count == 0 ? 0.0 : (double) sum / count);
+    };
+    System.out.println(s.getAsDouble());
+  }
+
+  public static void main(String[] args) {
+    new Main().test("a", "bbb", null, "cc", "dd", "eedasfasdfs");
+  }
+}