From: Ralf Jung <post@ralfj.de>
Date: Mon, 6 Jul 2015 15:00:56 +0000 (+0200)
Subject: implement and test subtraction
X-Git-Url: https://git.ralfj.de/rust-101.git/commitdiff_plain/3b6f45e080b0d90f65a74f6c9534545d726a9432?ds=sidebyside;hp=3b6f45e080b0d90f65a74f6c9534545d726a9432

implement and test subtraction
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