title: Browser tries to load ClojureScript source map from the wrong path
body: <p>I'm using Boot to build a Clojure(Script) web app.
  The browser loads the transpiled code from <a href="http://localhost:8080/main.out/calculators/frontend/core.js" rel="nofollow">http://localhost:8080/main.out/calculators/frontend/core.js</a></p>
  
  <p>The last line of that file is</p>
  
  <pre><code>//# sourceMappingURL=core.js.map
  </code></pre>
  
  <p>I can load that map file from the browser using the URL 
  <a href="http://localhost:8080/main.out/calculators/frontend/core.js.map" rel="nofollow">http://localhost:8080/main.out/calculators/frontend/core.js.map</a></p>
  
  <p>However, if in Chrome Dev Tools' Sources panel I search for the corresponding ClojureScript file, it appears with a wrong URL (see the <code>main.out/calculators/frontend</code> nested in itself)
  <a href="http://localhost:8080/main.out/calculators/frontend/main.out/calculators/frontend/core.cljs" rel="nofollow">http://localhost:8080/main.out/calculators/frontend/main.out/calculators/frontend/core.cljs</a></p>
  
  <p>and when loaded, no code is shown and "(source mapped from core.js)" appears in the status bar.</p>
  
  <p>Which could be the problem?</p>