diff --git a/src/rawinterfaces/A.java b/src/rawinterfaces/A.java
new file mode 100644
index 0000000..140f105
--- /dev/null
+++ b/src/rawinterfaces/A.java
@@ -0,0 +1,5 @@
+package rawinterfaces;
+
+public class A implements _B{
+
+}
diff --git a/src/rawinterfaces/Main.java b/src/rawinterfaces/Main.java
new file mode 100644
index 0000000..fb8972f
--- /dev/null
+++ b/src/rawinterfaces/Main.java
@@ -0,0 +1,9 @@
+package rawinterfaces;
+
+public class Main {
+	@SuppressWarnings("unchecked")
+	public static void main(String[] args) {
+		A a = new A();
+		a.m(null);
+	}
+}
diff --git a/src/rawinterfaces/Something.java b/src/rawinterfaces/Something.java
new file mode 100644
index 0000000..1e82f4f
--- /dev/null
+++ b/src/rawinterfaces/Something.java
@@ -0,0 +1,5 @@
+package rawinterfaces;
+
+public class Something {
+
+}
diff --git a/src/rawinterfaces/_A.java b/src/rawinterfaces/_A.java
new file mode 100644
index 0000000..f486ec9
--- /dev/null
+++ b/src/rawinterfaces/_A.java
@@ -0,0 +1,5 @@
+package rawinterfaces;
+
+public interface _A<T> {
+	public void m(T a);
+}
diff --git a/src/rawinterfaces/_B.java b/src/rawinterfaces/_B.java
new file mode 100644
index 0000000..f1ab3d9
--- /dev/null
+++ b/src/rawinterfaces/_B.java
@@ -0,0 +1,7 @@
+package rawinterfaces;
+
+public interface _B<T extends Something> extends _A<T>{
+	public default void m(T a) {
+		System.out.println("hello world");
+	}
+}