From: Martin Pitt <martin@piware.de>
Date: Sun, 29 Aug 2021 06:49:44 +0000 (+0200)
Subject: concepts: Rewrite Cacher tests using RefCell
X-Git-Url: https://piware.de/gitweb/?p=learn-rust.git;a=commitdiff_plain;h=104293d702699d7338144e3fe6384a283a1e5db2;hp=104293d702699d7338144e3fe6384a283a1e5db2

concepts: Rewrite Cacher tests using RefCell

Avoids an external crate.
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