recognize .cargo/config.toml

[xxchan]

I have

[target.'cfg(all())']
rustflags = [
    "--cfg",
    "tokio_unstable"
]

in the project's .cargo/config.toml. But it seems this is not recognized by cargo-udeps, unlike other cargo commands. 🤔 After manually setting export RUSTFLAGS="--cfg tokio_unstable" it works fine.

It causes errors like this are produced:

error[E0433]: failed to resolve: use of undeclared crate or module `tracing`
   --> /Users/xxchan/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.25.0/src/time/interval.rs:403:20
    |
403 |     resource_span: tracing::Span,
    |                    ^^^^^^^ use of undeclared crate or module `tracing`