As of f8eb190f6beb146ba25ca9ad4c52ee32d122a158, `Cargo.lock` is outdated. https://aur.archlinux.org/cgit/aur.git/plain/fix-outdated-lockfile.patch?h=squawk-cli&id=1e2ea200deb74156a572f0c17e3184d793579f34 can be applied to fix this issue.