Description:
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http://php.net/manual/en/tokens.php
defined T_NS_C as the token for "__NAMESPACE__" and notes that it is "[a]lso defined as T_NAMESPACE".

My own tests have shown, that T_NAMESPACE is used for a very different thing: "namespace".

Please distinguish between those two in the documentation.

Test script:
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echo '<pre>';
var_dump(token_get_all('<?php namespace __NAMESPACE__ ?>'));
echo token_name(377), "\n", token_name(378);
echo '</pre';