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## Compilers now have a `has_define` method
This method returns true if the given preprocessor symbol is
defined, else false is returned. This is useful is cases where
an empty define has to be distinguished from a non-set one, which
is not possible using `get_define`.
Additionally it makes intent clearer for code that only needs
to check if a specific define is set at all and does not care
about its value.
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