Import rasta tests.

pkg/fasta/test/rasta/super_operator.dart.dartk.expect

+library;
+import self as self;
+import "dart:core" as core;
+
+class A extends core::Object {
+  constructor •() → self::A
+    : super core::Object::•();
+  operator +(core::String s) → dynamic
+    return null;
+  operator [](dynamic i) → dynamic
+    return null;
+  operator []=(dynamic i, dynamic val) → dynamic {}
+}
+class B extends self::A {
+  constructor •() → self::B
+    : super self::A::•();
+  operator +(core::String s) → dynamic
+    return super.{self::A::+}("${s}${s}");
+  operator [](dynamic i) → dynamic
+    return super.{self::A::[]}(i);
+  operator []=(dynamic i, dynamic val) → dynamic
+    return let final dynamic #t1 = let final dynamic #t2 = i in let final dynamic #t3 = i = #t2.+(1) in #t2 in let final dynamic #t4 = super.{self::A::[]}(#t1).+(val) in let final dynamic #t5 = super.{self::A::[]=}(#t1, #t4) in #t4;
+}
+class Autobianchi extends core::Object {
+  constructor •() → self::Autobianchi
+    : super core::Object::•();
+  method g() → dynamic
+    return super.[](0);
+}