class People {
  string name;
  int age;
  string male;
  string phrase;

  this(string name, int age, string male, string phrase) {
    this.name = name;
    this.age = age;
    this.male = male;
    this.phrase = phrase;
  }
  
  People say() {
    return phrase;
  }

  People dup() const {
    return new People(name, age, male, phrase);
  }
}

void main(string[] args) {
  auto var1 = new People("Max", 24, "man", "Hello");
  writeln(var1.say(), var1.name);
}

Error: cannot implicitly convert expression `this.phrase` of type `string` to `app.People`
/usr/bin/dmd failed with exit code 1