Implement super calls.

frog/tests/leg_only/src/SuperCallTest.dart

Index: frog/tests/leg_only/src/SuperCallTest.dart
diff --git a/frog/tests/leg_only/src/SuperCallTest.dart b/frog/tests/leg_only/src/SuperCallTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..85ad2bec581dbd88107817013ab16de12b293e90
--- /dev/null
+++ b/frog/tests/leg_only/src/SuperCallTest.dart
@@ -0,0 +1,17 @@
+class A {
+  foo() => "A.foo" + baz();
+  baz() => "A.baz";
+  hest(String s, int i) => s + i;
+}
+
+class B extends A {
+  foo() => "B.foo" + super.foo();
+  baz() => "B.baz";
+  hest(s, i) => "B.hest" + super.hest(s, i);
+}
+
+main() {
+  B b = new B();
+  Expect.equals("B.fooA.fooB.baz", b.foo());
+  Expect.equals("B.hestfisk42", b.hest('fisk', 42));
+}