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

static final field core::bool isLegacySubtyping1a = #C1 is core::List<core::int>;
static const field core::bool isLegacySubtyping1b = #C2;
static final field core::bool isLegacySubtyping2a = #C3 is core::List<core::int>;
static const field core::bool isLegacySubtyping2b = #C2;
static final field core::List<core::int> assertLegacySubtyping1a = #C1 as core::List<core::int>;
static const field core::List<core::int> assertLegacySubtyping1b = #C1;
static final field core::List<core::int> assertLegacySubtyping2a = #C3 as core::List<core::int>;
static const field core::List<core::int> assertLegacySubtyping2b = #C3;
static method main() → void {
  self::expect(self::isLegacySubtyping1a, #C2);
  self::expect(self::isLegacySubtyping2a, #C2);
  self::expect(self::assertLegacySubtyping1a, #C1);
  self::expect(self::assertLegacySubtyping2a, #C3);
}
static method expect(dynamic expected, dynamic actual) → dynamic {
  if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
    throw "Expected ${expected}, actual ${actual}";
}

constants  {
  #C1 = <Null>[]
  #C2 = true
  #C3 = <core::int?>[]
}