I have a use case where used traits are being incorrectly detected as namespace imports.

Looking at ContextFactory->createForNamespace, it seems that the check is simply looking for all T_USE tokens, and not checking whether they are within the context of a T_CLASS token.

For example, given this PHP code:

<?php
namespace Foo;

trait FooTrait {}

class FooClass {
    use FooTrait;
}

... when creating context for this, the namespace aliases should be simply empty array [] as there ARE no namespace aliases. However, ContextFactory currently picks up the use FooTrait; and thinks it is a namespace alias.

I have provided a failing test case that can be added to tests/unit/Types/ContextFactoryTest.php:

public function testTraitUseIsNotDetectedAsNamespaceUse()
{
    $fixture = new ContextFactory();

    $php = "<?php
    namespace Foo;

    trait FooTrait {}

    class FooClass {
        use FooTrait;
    }
    ";

    $fixture = new ContextFactory();
    $context = $fixture->createForNamespace('Foo', $php);

    $this->assertSame([], $context->getNamespaceAliases());
}