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

class Expect extends core::Object {
  synthetic constructor •() → self::Expect
    : super core::Object::•()
    ;
  static method equals(dynamic x, dynamic y) → void {
    if(!(x =={core::Object::==}{(core::Object) → core::bool} y)) {
      throw "Expected two equal values, got '${x}' and '${y}'.";
    }
  }
  static method isTrue(core::bool b) → void {
    if(!b) {
      throw "Expected condition to be true, but got false.";
    }
  }
}
extension type ET(core::Object? _) {
  abstract extension-type-member representation-field get _() → core::Object?;
  method call = self::ET|call;
  method tearoff call = self::ET|get#call;
  constructor • = self::ET|constructor#;
  constructor tearoff • = self::ET|constructor#_#new#tearOff;
}
static extension-type-member method ET|constructor#(core::Object? _) → self::ET% /* erasure=core::Object?, declared=! */ {
  lowered final self::ET% /* erasure=core::Object?, declared=! */ #this = _;
  return #this;
}
static extension-type-member method ET|constructor#_#new#tearOff(core::Object? _) → self::ET% /* erasure=core::Object?, declared=! */
  return self::ET|constructor#(_);
static extension-type-member method ET|call(lowered final self::ET% /* erasure=core::Object?, declared=! */ #this) → core::String
  return "ET";
static extension-type-member method ET|get#call(lowered final self::ET% /* erasure=core::Object?, declared=! */ #this) → () → core::String
  return () → core::String => self::ET|call(#this);
static method func(core::Function callable) → core::Function
  return callable;
static method main() → void {
  self::ET% /* erasure=core::Object?, declared=! */ et = self::ET|constructor#(null);
  self::Expect::isTrue(self::func(self::ET|get#call(et)) is core::Function);
  self::Expect::isTrue(self::ET|get#call(et) is core::Function);
  self::Expect::equals(self::func(self::ET|get#call(et))(), self::ET|call(et));
  self::Expect::equals(self::func(self::ET|get#call(et))(), "ET");
}