Description:
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There is no support for DIRECT access constants, static properties or static methods from static context. It means, that there is only "one-level" ability to access theese things.
We have to use workaround to eliminate this problem. But this workaround rises up a code and seems strange.

Test script:
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echo config::$languageFile::error404;

Expected result:
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The page was not found

Actual result:
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Parse error: syntax error, unexpected T_PAAMAYIM_NEKUDOTAYIM, expecting ',' or ';'
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The workaround is:

$languageFile = config::$languageFile;
echo $languageFile::error404;

The code above works. The direct access would be purer and easier.