method refs: ambiguity (IDEA-113078)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/methodRef/VoidReturnTypeAmbiguity.java

@@ -0,0 +1,29 @@
+class App {
+
+    public static void main(String[] args) {
+        test(App::getLength);
+    }
+
+    private static Integer getLength(String word) {
+        return word.length();
+    }
+
+
+    private static void <warning descr="Private method 'test(App.Consumer<java.lang.String>)' is never used">test</warning>(Consumer<String> consumer) {
+        consumer.accept("Hello World");
+    }
+
+    private static void test(Function<String, Integer> function) {
+        Integer result = function.apply("Hello World");
+        System.out.println(result);
+    }
+
+    interface Function<T, R> {
+        R apply(T t);
+    }
+
+    interface Consumer<T> {
+        void accept(T t);
+    }
+}
+