Complain about incorrect this/super constructor initializers.

pkg/front_end/test/fasta/rasta/enum.dart.outline.expect

Index: pkg/front_end/test/fasta/rasta/enum.dart.outline.expect
diff --git a/pkg/front_end/test/fasta/rasta/enum.dart.outline.expect b/pkg/front_end/test/fasta/rasta/enum.dart.outline.expect
index 9b3c542f16aa899d99d3b0b8d2cdc8e2eece55de..b76e9933748b28173edc4b4376e9a8158d278b8b 100644
--- a/pkg/front_end/test/fasta/rasta/enum.dart.outline.expect
+++ b/pkg/front_end/test/fasta/rasta/enum.dart.outline.expect
@@ -8,7 +8,7 @@ class Foo extends core::Object {
   static const field self::Foo ec1 = const self::Foo::•(0);
   static const field self::Foo ec2 = const self::Foo::•(1);
   const constructor •(core::int index) → void
-    : self::Foo::index = index
+    : self::Foo::index = index, super core::Object::•()
     ;
   method toString() → core::String
     return const <core::int, core::String>{0: "Foo.ec1", 1: "Foo.ec2"}.[](this.{=self::Foo::index});