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

static method test1(dynamic x) → dynamic {
  final dynamic #t1 = x;
  core::bool #t2 = true;
  dynamic #t3;
  final dynamic #t4 = #t1;
  if(#t4 is core::List<dynamic> && #t4{core::List<dynamic>}.{core::List::length}{core::int} =={core::num::==}{(core::Object) → core::bool} 1) {
    final dynamic #t5 = #t4{core::List<dynamic>}.{core::List::[]}(0){(core::int) → dynamic};
    final dynamic #t6 = #t5;
    if(#t6 is core::int) {
      #t3 = #t6{core::int};
      #t2 = false;
    }
  }
  if(#t2)
    throw new _in::ReachabilityError::•();
  core::int y = #t3{core::int};
  return y;
}
static method test2(dynamic x) → dynamic {
  final dynamic #t7 = x;
  core::bool #t8 = true;
  dynamic #t9;
  dynamic #t10;
  final dynamic #t11 = #t7;
  if(#t11 is core::List<dynamic> && #t11{core::List<dynamic>}.{core::List::length}{core::int}.{core::num::>=}(2){(core::num) → core::bool}) {
    final dynamic #t12 = #t11{core::List<dynamic>}.{core::List::[]}(0){(core::int) → dynamic};
    final dynamic #t13 = #t11{core::List<dynamic>}.{core::List::[]}(#t11{core::List<dynamic>}.{core::List::length}{core::int}.{core::num::-}(1){(core::num) → core::num}){(core::int) → dynamic};
    final dynamic #t14 = #t12;
    if(#t14 is core::String) {
      final dynamic #t15 = #t13;
      if(#t15 is core::String) {
        #t9 = #t14{core::String};
        #t10 = #t15{core::String};
        #t8 = false;
      }
    }
  }
  if(#t8)
    throw new _in::ReachabilityError::•();
  core::String a = #t9{core::String};
  core::String b = #t10{core::String};
  return a.{core::String::+}(b){(core::String) → core::String};
}
static method main() → dynamic {
  self::expectEquals(self::test1(<core::int>[0]), 0);
  self::expectThrows(() → void => self::test1(<dynamic>[]));
  self::expectThrows(() → void => self::test1(<core::int>[0, 1, 2]));
  self::expectEquals(self::test2(<core::String>["one", "two", "three", "four"]), "onefour");
  self::expectThrows(() → void => self::test2(<core::String>["one"]));
  self::expectThrows(() → void => self::test2("one"));
  self::expectThrows(() → void => self::test2(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}.";
  }
}
static method expectThrows(() → void f) → dynamic {
  core::bool hasThrown = true;
  try {
    f(){() → void};
    hasThrown = false;
  }
  on core::Object catch(final core::Object e) {
  }
  if(!hasThrown) {
    throw "Expected function to throw.";
  }
}