lambda: accept? inference variables as target type for lambda expression during lambda constraint reduction (IDEA-136435)

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

@@ -0,0 +1,11 @@
+import java.util.function.Supplier;
+
+class Test {
+  {
+    Supplier<Runnable> x = foo(() -> () -> {});
+  }
+
+  static <T> Supplier<T> foo(Supplier<T> delegate) {
+    return null;
+  }
+}