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

import "dart:math" as math;

abstract sealed class Shape extends core::Object {
  synthetic constructor •() → self::Shape
    ;
  abstract method calculateArea() → core::double;
}
class Square extends core::Object implements self::Shape {
  final field core::double length;
  constructor •(core::double length) → self::Square
    ;
  method calculateArea() → core::double
    ;
}
class Circle extends core::Object implements self::Shape {
  final field core::double radius;
  constructor •(core::double radius) → self::Circle
    ;
  method calculateArea() → core::double
    ;
}
static method calculateArea(self::Shape shape) → core::double
  ;
static method main() → dynamic
  ;
static method expect(dynamic expected, dynamic actual) → dynamic
  ;