trait Escaper {
    type FieldType;
    fn escape(&self, field: &Self::FieldType) -> String;
}

struct StringEscaper;
impl Escaper for StringEscaper {
    type FieldType = String;
    fn escape(&self, field: &Self::FieldType) -> String {
        format!("\"{}\"", field.replace('\\', r"\\").replace('"', r#"\""#).replace('\n', r"\\n"))
    }
}

struct IntEscaper;
impl Escaper for IntEscaper {
    type FieldType = i64;
    fn escape(&self, field: &Self::FieldType) -> String {
        field.to_string()
    }
}

fn escape_field<T: Escaper>(escaper: T, name: &str, field_value: &T::FieldType) {
    println!("let {} = {};", name, escaper.escape(field_value));
}

fn main() {
    escape_field(StringEscaper, "string", &r#"Hello" \world"#.to_string());
    escape_field(IntEscaper, "integer", &1234);
}