new inference: testdata to prevent regression

(cherry picked from commit 48a86f05e7661d2a96cf6c6d95eaa4629446d0bb)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/graphInference/JDK8028774.java

@@ -0,0 +1,20 @@
+import java.util.*;
+
+abstract class TypeTest {
+
+    interface I {}
+
+    public Collection<? extends I> excludeFrom(Collection<? extends I> include, Collection<? extends I> exclude) {
+        return copyOf(filter(include, not(in(exclude))));
+    }
+
+    interface Predicate<T> {
+        boolean apply(T t);
+    }
+
+    abstract <T> Predicate<T> in(Collection<? extends T> target);
+    abstract <T> Predicate<T> not(Predicate<T> aPredicate);
+    abstract <E> List<E> copyOf(Iterable<? extends E> elements);
+
+    abstract <T> Iterable<T> filter(Iterable<T> unfiltered, Predicate<? super T> predicate);
+}