disjunction type equals/hashCode, essential for new inference (IDEA-140150)

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

@@ -0,0 +1,28 @@
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.util.Optional;
+
+class Main {
+  public static class Either<A, B> {
+    final public Optional<A> _1;
+    final public Optional<B> _2;
+
+    private Either(Optional<A> _1, Optional<B> _2) {
+      this._1 = _1;
+      this._2 = _2;
+    }
+
+    public static <A, B> Either<A, B> _2(B value) {
+      return null;
+    }
+  }
+
+  public Either<String, Exception> test1() {
+    try {
+      new FileOutputStream("").write(1);
+      return null;
+    } catch (NullPointerException | IOException e) {
+      return Either._2(e);
+    }
+  }
+}