title: arc lint command fails with error #1
body: <p>I've configured <a href="https://secure.phabricator.com/book/phabricator/article/arcanist_lint/" rel="nofollow">arc lint</a> to use <a href="https://www.google.com.ua/url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=1&amp;cad=rja&amp;uact=8&amp;ved=0ahUKEwixo6qxxPLNAhVBOpQKHdjxCasQFggcMAA&amp;url=https%3A%2F%2Fwww.pylint.org%2F&amp;usg=AFQjCNHL4Nwzaw3j6Nh5W8NLBktlLcgJ_A&amp;sig2=O3ORNIOShCN82kv0dp74Tw" rel="nofollow">pylint</a> by defining linters in <code>.arclint</code> file:</p>
  
  <pre><code>{
    "linters": {
      "pylint": {
        "type": "pylint",
        "include": "(\\.py$)"
      }
    }
  }
  </code></pre>
  
  <p>After exectuing <code>arc lint</code> command on any <code>*.py</code> I am getting next exception:</p>
  
  <pre><code>[2016-07-12 14:18:10] EXCEPTION: (PhutilAggregateException) Some linters failed:
  - CommandException: Command failed with error #1!
    COMMAND
    'pylint' '--reports=no' '--msg-template={line}|{column}|{msg_id}|{symbol}|{msg}' '/Users/aivaneyko/Projects/raw/module/file.py'
  
    STDOUT
    ************* Module module.file
  
  
    STDERR
    Traceback (most recent call last):
      File "/Users/aivaneyko/Projects/raw/env/bin/pylint", line 11, in &lt;module&gt;
        sys.exit(run_pylint())
      File "/Users/aivaneyko/Projects/raw/env/lib/python2.7/site-packages/pylint/__init__.py", line 23, in run_pylint
        Run(sys.argv[1:])
      File "/Users/aivaneyko/Projects/raw/env/lib/python2.7/site-packages/pylint/lint.py", line 1315, in __init__
        linter.check(args)
      File "/Users/aivaneyko/Projects/raw/env/lib/python2.7/site-packages/pylint/lint.py", line 736, in check
        self._do_check(files_or_modules)
      File "/Users/aivaneyko/Projects/raw/env/lib/python2.7/site-packages/pylint/lint.py", line 867, in _do_check
        self.check_astroid_module(ast_node, walker, rawcheckers, tokencheckers)
      File "/Users/aivaneyko/Projects/raw/env/lib/python2.7/site-packages/pylint/lint.py", line 947, in check_astroid_module
        walker.walk(ast_node)
      File "/Users/aivaneyko/Projects/raw/env/lib/python2.7/site-packages/pylint/utils.py", line 938, in walk
        self.wa... (1,689 more bytes) ... at [&lt;arcanist&gt;/src/lint/engine/ArcanistLintEngine.php:274]
  arcanist(head=master, ref.master=4d4d16f25985), phutil(head=master, ref.master=32c56dc20b39)
    #0 &lt;#2&gt; ExecFuture::resolvex() called at [&lt;arcanist&gt;/src/lint/linter/ArcanistExternalLinter.php:448]
    #1 &lt;#2&gt; ArcanistExternalLinter::resolveFuture(string, ExecFuture) called at [&lt;arcanist&gt;/src/lint/linter/ArcanistFutureLinter.php:34]
    #2 &lt;#2&gt; ArcanistFutureLinter::didLintPaths(array) called at [&lt;arcanist&gt;/src/lint/engine/ArcanistLintEngine.php:594]
    #3 &lt;#2&gt; ArcanistLintEngine::executeDidLintOnPaths(ArcanistPyLintLinter, array) called at [&lt;arcanist&gt;/src/lint/engine/ArcanistLintEngine.php:545]
    #4 &lt;#2&gt; ArcanistLintEngine::executeLintersOnChunk(array, array) called at [&lt;arcanist&gt;/src/lint/engine/ArcanistLintEngine.php:473]
    #5 &lt;#2&gt; ArcanistLintEngine::executeLinters(array) called at [&lt;arcanist&gt;/src/lint/engine/ArcanistLintEngine.php:216]
    #6 ArcanistLintEngine::run() called at [&lt;arcanist&gt;/src/workflow/ArcanistLintWorkflow.php:334]
    #7 ArcanistLintWorkflow::run() called at [&lt;arcanist&gt;/scripts/arcanist.php:394]
  </code></pre>
  
  <p>My <code>arc --version</code> output:</p>
  
  <blockquote>
    <p>arcanist 4d4d16f25985f133501f20fdddd183e525f00341 (28 Jun 2016)</p>
    
    <p>libphutil 32c56dc20b39cffd0cfef931f6f4ab9c99f12677 (7 Jul 2016)</p>
  </blockquote>
  
  <p>My <code>pylint --version</code> output:</p>
  
  <blockquote>
    <p>pylint 1.5.6,  astroid 1.4.7 Python 2.7.10 (default, Oct 23 2015,
    19:19:21)  [GCC 4.2.1 Compatible Apple LLVM 7.0.0 (clang-700.0.59.5)]</p>
  </blockquote>
  
  <p>I've faced exception on <strong>PHP 5.5.34</strong>, after upgrading to <strong>PHP 5.6.23</strong> problem still exist. Also I've tried to install other version of arcanist without success - <code>arcanist 57f6fb59d73994d90cd94143787424ce0fdbf73b (25 Jan 2016)</code>, <code>libphutil f43291e99d36045bc459e5133454c0d8fd8768ea (21 Jan 2016)</code>.</p>
  
  <p>OS: <strong>El Capitan 10.11.5</strong></p>