library;
import self as self;
import "dart:core" as core;

class A extends core::Object {
  field core::double? foo1;
  field core::String? foo2;
  field core::int foo3;
  synthetic constructor •() → self::A
    ;
  operator []=(core::bool key, core::String? value) → void
    ;
  operator [](core::bool key) → core::String?
    ;
}
class B extends self::A {
  synthetic constructor •() → self::B
    ;
  method test() → dynamic
    ;
}
extension E on dynamic {
  operator []= = self::E|[]=;
  operator [] = self::E|[];
}
static extension-member method E|[]=(lowered final dynamic #this, core::String key, core::int? value) → void
  ;
static extension-member method E|[](lowered final dynamic #this, core::String key) → core::int?
  ;
static method main() → dynamic
  ;