Using arcanist on git commit 59640f7eae3f7c0a352c18e784fb55acb7967991, the following errors can be seen:
```
$ bin/arc unit --everything --no-coverage
```
```
FAIL ArcanistPhpcsLinterTestCase::testVersion
Assertion failed, expected 'true' (at ArcanistExternalLinterTestCase.php:10): Failed to parse version from command.
ACTUAL VALUE
false
```
I am using PHP_CodeSniffer 1.5.0RC4, so it seems that regexp in src/lint/linter/ArcanistPhpcsLinter.php does not match
- `$ phpcs --version`
- `PHP_CodeSniffer version 1.5.0RC4 (beta) by Squiz (http://www.squiz.net)`
Here is a quick and dirty patch:
```
diff --git a/src/lint/linter/ArcanistPhpcsLinter.php b/src/lint/linter/ArcanistPhpcsLinter.php
index 8475c55..5364ec3 100644
--- a/src/lint/linter/ArcanistPhpcsLinter.php
+++ b/src/lint/linter/ArcanistPhpcsLinter.php
@@ -88,7 +88,7 @@ final class ArcanistPhpcsLinter extends ArcanistExternalLinter {
list($stdout) = execx('%C --version', $this->getExecutableCommand());
$matches = array();
- $regex = '/^PHP_CodeSniffer version (?P<version>\d+\.\d+\.\d+)\b/';
+ $regex = '/^PHP_CodeSniffer version (?P<version>\d+\.\d+\.\d+)(RC\d)?\b/';
if (preg_match($regex, $stdout, $matches)) {
return $matches['version'];
} else {
```