new inference: initial tests

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting8/IDEA20573.java

@@ -0,0 +1,26 @@
+public class GoodCodeIsRed {
+
+    public void test() {
+        FileIF file = new FileImpl();
+        file.getInputStream();
+    }
+}
+
+class FileImpl implements FileIF {
+
+    public void getInputStream() {
+    }
+
+}
+
+interface FileIF extends BasicFileIF, DataSource {
+}
+
+interface BasicFileIF {
+    void getInputStream();
+}
+
+
+interface DataSource {
+    void getInputStream() throws java.io.IOException;
+}