Matches https://github.com/ilyagr/pijul-clone as of now, might become out of sync

flake.nix: add rust-src to devShell

Created by  loewenheim  on November 17, 2020
IXGIROWKSRQM2E5Q7OVB7ZHGY5I5NSHI2WOOPLEHRKACNE3QH2JAC
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