title: Crystal multi line comment
body: <p>Are there any multi line comments in Crystal ? Such as Ruby does :</p>
  
  <pre><code>=begin
      this is a
      multiline
      comment in Ruby
  =end
  </code></pre>
  
  <p>This will simply give me an error in Crystal :</p>
  
  <p><code>unexpected token: =</code></p>