Update A.java, Main.java, and 3 more files...

src/rawinterfaces/A.java

@@ -0,0 +1,5 @@
+package rawinterfaces;
+
+public class A implements _B{
+
+}

src/rawinterfaces/Main.java

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+package rawinterfaces;
+
+public class Main {
+	@SuppressWarnings("unchecked")
+	public static void main(String[] args) {
+		A a = new A();
+		a.m(null);
+	}
+}

src/rawinterfaces/Something.java

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+package rawinterfaces;
+
+public class Something {
+
+}

src/rawinterfaces/_A.java

@@ -0,0 +1,5 @@
+package rawinterfaces;
+
+public interface _A<T> {
+	public void m(T a);
+}

src/rawinterfaces/_B.java

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+package rawinterfaces;
+
+public interface _B<T extends Something> extends _A<T>{
+	public default void m(T a) {
+		System.out.println("hello world");
+	}
+}