New Cargo versions sometimes write out a lockfile that triggers parse failures in old Cargo versions.
$ cargo +1.41.0 check ... Finished dev [unoptimized + debuginfo] target(s) in 0.91s $ cargo +1.37.0 check error: failed to parse lock file at: /git/testing/Cargo.lock Caused by: invalid serialized PackageId for key `package.dependencies`
cargo rm subcommand simply deletes the offending lockfile so that the old
Cargo can proceed. Install by running
cargo install cargo-rm.
cargo rm has three advantages:
It still works if run from a workspace member, where the lockfile would be located at the workspace root rather than the current directory.
It works if run from a subdirectory of a crate rather than the crate root.
If like me you use
export FIGNORE=argo.lockin your shell so that all autocompletes prefer Cargo.toml over Cargo.lock, this is easier to type.
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