title: Is there a simple way to generate the lowercase and uppercase English alphabet in Rust?
body: <p>This is what I'm doing so far:</p>
  
  <pre><code>fn main() {
      let a = (0..58).map(|c| ((c + 'A' as u8) as char).to_string())
                         .filter(|s| !String::from("[\\]^_`").contains(s) )
                         .collect::&lt;Vec&lt;_&gt;&gt;();    
  
      println!("{:?}", a);
  }
  </code></pre>
  
  <p>Output is:</p>
  
  <pre class="lang-none prettyprint-override"><code>["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"]
  </code></pre>
  
  <p>Also no crates if possible.</p>