130f37de8b
redbear-greeter's manifest has
redbear-login-protocol = { path = "../../redbear-login-protocol/source" }
Cargo resolves that relative to the manifest, so out-of-tree staging pointed it
at <recipe>/target/redbear-login-protocol/source:
failed to read .../target/redbear-login-protocol/source/Cargo.toml
No such file or directory (os error 2)
Rewriting the manifest would silently change dependency paths behind the
recipe's back. Leaving these in tree is the honest option: they are cargo
recipes that do not sed their source, so the mutation risk staging exists to
prevent does not apply to them.