title: backslash in dictionary in julia
body: <p>I can quickly create a dictionary in julia via: </p>
  
  <pre><code>julia&gt; d = ['a' =&gt; 1, 'b' =&gt; 2 ]
  Dict{Char,Int64} with 2 entries:
    'b' =&gt; 2
    'a' =&gt; 1
  </code></pre>
  
  <p>Now, I want the backslash character as a key in my dictionary. This results in an error because it will escape the <code>'</code>. Instead, I try to escape the <code>\</code> with another. This doesn't cause an error, but doens't give me the correct result either. </p>
  
  <pre><code>julia&gt; d = ['\\' =&gt; 3]
  Dict{Char,Int64} with 1 entry:
    '\\' =&gt; 3
  </code></pre>
  
  <p>What am I missing? </p>