title: Round brackets, curly braces
body: <p>I am trying to understand this code:
  <a href="https://github.com/CameronAavik/AdventOfCode/blob/master/Challenges/2018/Day03.fs" rel="nofollow noreferrer">https://github.com/CameronAavik/AdventOfCode/blob/master/Challenges/2018/Day03.fs</a></p>
  
  <p>But I couldn't find any info about this "let something (...) { ... } = ..."syntax, for example:</p>
  
  <pre><code>let processBoundary (prevY, claimSet, total) {cursor=cursor; isAdding=isAdding; data=(top, height)} = ...
  </code></pre>
  
  <p>what is this? reminds me to a tuple and destructuring, but maybe it is not that.</p>
  
  <p>thanks</p>