Description:
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don't defined __COMPILER_HALT_OFFSET__ under namespace.

PHP 5.6 works fine.

Test script:
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<?php
namespace A;
echo __COMPILER_HALT_OFFSET__;
__halt_compiler();

Expected result:
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70

Actual result:
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PHP Notice:  Use of undefined constant __COMPILER_HALT_OFFSET__ - assumed '__COMPILER_HALT_OFFSET__' in /root/test.php on line 3