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This should be correctly credited to @marius851000 since I copied it directly from #166, since it was a narrow part of that changeset that I could understand/justify.
What it does is, in the case that you have a git reference to a crate whose git repo contains workspaces, e.g. mutagen, then rather than trying to directly use the root Cargo.toml (which has no information, just a list of workspaces), it parses it to find the path to the actual Cargo.toml for the crate we're trying to depend on, and uses that.