Substitution of [] for empty fields is done while parsing the package
config by ghc. It should be either done by ghc-pkg, or ghc-pkg should
omit these fields. But ghc-pkg --add-package reports parse error when
some fields are missing (e.g. source_dirs).
--
__("< Marcin Kowalczyk * qrczak@knm.org.pl http://qrczak.ids.net.pl/
\__/
^^ SYGNATURA ZASTĘPCZA
QRCZAK