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

class Class1 extends core::Object {
  synthetic constructor •() → self::Class1
    ;
  get field() → self::Class2?
    ;
  operator [](core::int index) → core::int
    ;
  operator []=(core::int index, core::int value) → void
    ;
}
class Class2 extends core::Object {
  field core::int field;
  synthetic constructor •() → self::Class2
    ;
}
extension Extension on self::Class2 {
  operator [] = self::Extension|[];
  operator []= = self::Extension|[]=;
}
static method Extension|[](lowered final self::Class2 #this, core::int index) → core::int
  ;
static method Extension|[]=(lowered final self::Class2 #this, core::int index, core::int value) → void
  ;
static method main() → dynamic
  ;