method reference constraints (IDEA-123223)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/newMethodRef/IDEA123223.java

@@ -0,0 +1,31 @@
+import java.util.List;
+import java.util.function.Function;
+
+class FluTr<K> {
+
+  class Group {
+    List<Authority> getAuthorities() {
+      return null;
+    }
+  }
+
+  class Authority {
+    String getPermission() {
+      return null;
+    }
+  }
+
+  public void filterForPermission(final String permission) {
+    transformAndConcat(Group::getAuthorities)
+      .transform(Authority::getPermission)
+      .contains(permission);
+  }
+
+  boolean contains(String f) {
+    return false;
+  }
+
+  public final <T> FluTr<T> transform(Function<? super K,T> function) { return null; }
+  public <T> FluTr<T> transformAndConcat(Function<? super Group,? extends Iterable<? extends T>> function) { return null; }
+
+}