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ref: a9fd272915d06287c5e0b9384c383fb1468ddb60 parent: 082c88b71ad547d44e52ef4e888dd94d2fa756a8 author: Paul Brossier <piem@piem.org> date: Sun Jan 26 11:16:59 EST 2014
src/io/sink*: add _close function, improve error messages