class Class1 {}

class Class2 {}

extension DuplicateExtensionName on Class1 {
  uniqueMethod1() {}
  duplicateMethodName2() => 1;
}

extension DuplicateExtensionName on Class2 {
  uniqueMethod2() {}
  duplicateMethodName2() => 2;
}

extension UniqueExtensionName on Class1 {
  duplicateMethodName1() => 1;
  duplicateMethodName1() => 2;
}

main() {}
errors() {}