1 files changed, 38 insertions, 0 deletions
diff --git a/tests/errors/BadExtension.java b/tests/errors/BadExtension.java
new file mode 100644
index 000000000..32bfe8e9c
--- /dev/null
+++ b/tests/errors/BadExtension.java
@@ -0,0 +1,38 @@
+public class BadExtension { }
+
+abstract class Super {
+    public final void finalPublic() {}
+
+    public void justPublic() {}
+    public int intPublic() {}
+
+    public abstract void abstractWithBody() {} //ERROR shouldn't have a body
+
+    public abstract void abstractPublic();
+
+    public static final void staticFinalPublic() {}
+}
+
+class Sub extends Super { //ERROR must implement abstractPublic
+    public void finalPublic() {} //ERROR can't override final
+    void justPublic() {} //ERROR can't override with weaker access
+    public void intPublic() {} //ERROR can't change the return type
+
+    public static void staticFinalPublic() {} //ERROR can't even override static finals
+}
+
+
+
+interface I1 {
+    void m();
+}
+
+interface I2 {
+    int m();
+}
+
+class C12 implements I1, I2 {
+    public void m() {}  //ERROR incompatible return types with I2.m()
+}
+
+interface I12 extends I1, I2 {} //ERROR I1.m() and I2.m() are not compatible