arti/maint/downgrade_dependencies

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#!/bin/sh
#
# Downgrades every one of our dependencies in Cargo.lock to the
# earliest version listed in our Cargo.toml files. (And then
# re-upgrades a few second-order dependencies that aren't actually
# supported by our first-order dependencies in their oldest versions.)
cargo +nightly update -Z minimal-versions
cargo update \
-p crc32fast \
-p quote:0.6.3 \
-p zeroize_derive:1.1.1 \
-p env_logger:0.5.0 \
-p synstructure:0.12.0 \
-p nix:0.4.2