NPE

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/incomplete/MissedFunctionalInterfaceMethodReturnType.java

@@ -0,0 +1,22 @@
+class Test {
+
+  interface A {
+    A f();
+  }
+  interface B {}
+
+  static abstract class C implements A, B {}
+  static abstract class D implements A, B {}
+
+  interface I<T> {
+    <error descr="Invalid method declaration; return type required">m</error>(T arg);
+  }
+
+  void bar(C c) {
+    foo(c, x -> x.f());
+    foo(c, x -> x);
+  }
+
+  <T> void foo(T t1, I<T> t3) {}
+
+}