PSR12.Files.ImportStatement should not apply to traits

[chrisminett]

The PSR12.Files.ImportStatement sniff is being applied to use statements within a class, where they are used to implement traits. The sniff should not be applied in this scenario.

The PSR-12 documentation in section 3 applies to import statements before the class definition as described in the list at the top of the section (class-based, function-based, constant-based).

Traits are documented separately in section 4.2 and describe the requirements for the use keyword to implement traits, but does not require that the value does not start with a backslash.

h2. Current behaviour

<?php

namespace MyNamespace;

class MyClass
{
    use \MyTrait;
}

 $ phpcs --standard=PSR12 test.php                                                                     -1-

FILE: test.php
---------------------------------------------------------------------------------
FOUND 1 ERROR AFFECTING 1 LINE
---------------------------------------------------------------------------------
 7 | ERROR | Import statements must not begin with a leading backslash
---------------------------------------------------------------------------------

h2. Expected behaviour

With the same example, no error is found.

[gsherwood]

Thanks for reporting this. Fix will be in 3.5.2.