title: Dart/sass on OSX 10.13.3 "Cannot open file"
body: <p>In trying to learn/use sass for 1st time, I used Homebrew to install dart-sass on recently updated High Sierra  10.13.3   . That worked and sass --version shows 1.1.1    I created a simple .scss file:</p>
  
  <pre><code>$color: #d9534f;
  
  body {
      color: $color;
  }
  </code></pre>
  
  <p>and  while in the same directory, then issued: </p>
  
  <pre><code>sass main.scss main.css  --trace
  </code></pre>
  
  <p>in console and got:</p>
  
  <pre><code>Error reading main: Cannot open file.
  
  dart:io                               _File.readAsBytesSync
  package:sass/src/io/vm.dart 27        readFile
  package:sass/src/compile.dart 33      compile
  package:sass/sass.dart 63             compile
  package:sass/src/executable.dart 110  main
  </code></pre>
  
  <p>What do I need to change, learn  or do to get this working?</p>