library /*isNonNullableByDefault*/;
import self as self;
import "dart:core" as core;

static method test1(dynamic x) → dynamic {
  {
    hoisted core::int y;
    final synthesized dynamic #0#0 = x;
    late final synthesized dynamic #0#6 = #0#0{core::List<dynamic>}.{core::List::[]}(0){(core::int) → dynamic};
    if(#0#0 is{ForNonNullableByDefault} core::List<dynamic> && #0#0{core::List<dynamic>}.{core::List::length}{core::int} =={core::num::==}{(core::Object) → core::bool} #C1 && (#0#6 is{ForNonNullableByDefault} core::int && (let final dynamic #t1 = y = #0#6{core::int} in true))) {
      return y;
    }
    else {
      return null;
    }
  }
}
static method test2(dynamic x) → dynamic {
  {
    hoisted core::int y;
    final synthesized dynamic #0#0 = x;
    late final synthesized dynamic #0#6 = #0#0{core::List<dynamic>}.{core::List::[]}(0){(core::int) → dynamic};
    if(#0#0 is{ForNonNullableByDefault} core::List<dynamic> && #0#0{core::List<dynamic>}.{core::List::length}{core::int}.{core::num::>=}(#C1){(core::num) → core::bool} && (#0#6 is{ForNonNullableByDefault} core::int && (let final dynamic #t2 = y = #0#6{core::int} in true))) {
      return y;
    }
    else {
      return null;
    }
  }
}
static method test3(dynamic x) → dynamic {
  {
    hoisted core::int y;
    final synthesized dynamic #0#0 = x;
    late final synthesized core::int #0#2 = #0#0{core::List<dynamic>}.{core::List::length}{core::int};
    late final synthesized dynamic #0#6 = #0#0{core::List<dynamic>}.{core::List::[]}(#0#2.{core::num::-}(1){(core::num) → core::int}){(core::int) → dynamic};
    if(#0#0 is{ForNonNullableByDefault} core::List<dynamic> && #0#2.{core::num::>=}(#C1){(core::num) → core::bool} && (#0#6 is{ForNonNullableByDefault} core::int && (let final dynamic #t3 = y = #0#6{core::int} in true))) {
      return y;
    }
    else {
      return null;
    }
  }
}
static method main() → dynamic {
  self::expectEquals(self::test1(<core::int>[1]), 1);
  self::expectEquals(self::test1(<core::int>[1, 2, 3]), null);
  self::expectEquals(self::test1(<dynamic>[]), null);
  self::expectEquals(self::test1("foo"), null);
  self::expectEquals(self::test2(<core::int>[1]), 1);
  self::expectEquals(self::test2(<core::int>[1, 2, 3]), 1);
  self::expectEquals(self::test2(<dynamic>[]), null);
  self::expectEquals(self::test2("foo"), null);
  self::expectEquals(self::test3(<core::int>[1]), 1);
  self::expectEquals(self::test3(<core::int>[1, 2, 3]), 3);
  self::expectEquals(self::test3(<dynamic>[]), null);
  self::expectEquals(self::test3("foo"), null);
}
static method expectEquals(dynamic x, dynamic y) → dynamic {
  if(!(x =={core::Object::==}{(core::Object) → core::bool} y)) {
    throw "Expected ${x} to be equal to ${y}.";
  }
}

constants  {
  #C1 = 1
}