fix: General conditional compilation attributes (#8602)

* Remove general conditional compilation flags

See https://blog.rust-lang.org/2024/05/06/check-cfg.html

The conditional compilation flags for tor were superfluous as we can
make do fine with using only features.

* Update changelog

* Add `tokio_unstable` to to `unexpected_cfgs`

* Update changelog

* Fix `tokio_unstable` in `zebrad`

CHANGELOG.md

@@ -10,7 +10,8 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 ### Changed
 
 - We realized that a longer than `zcashd` end of support could be problematic in some cases so we reverted back from 20 to 16 weeks ([#8530](https://github.com/ZcashFoundation/zebra/pull/8530))
-
+- We're no longer using general conditional compilation attributes for `tor`,
+  but only feature flags instead.
 
 ## [Zebra 1.7.0](https://github.com/ZcashFoundation/zebra/releases/tag/v1.7.0) - 2024-05-07
 

tower-batch-control/Cargo.toml

@@ -47,3 +47,6 @@ tower-fallback = { path = "../tower-fallback/", version = "0.2.41-beta.13" }
 tower-test = "0.4.0"
 
 zebra-test = { path = "../zebra-test/", version = "1.0.0-beta.37" }
+
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(tokio_unstable)'] }

zebra-network/src/isolated.rs

@@ -16,8 +16,7 @@ use crate::{
 
 // Wait until `arti-client`'s dependency `x25519-dalek v1.2.0` is updated to a higher version. (#5492)
 // #[cfg(feature = "tor")]
-#[cfg(tor)]
-pub(crate) mod tor;
+// pub(crate) mod tor;
 
 #[cfg(test)]
 mod tests;

zebra-network/src/lib.rs

@@ -165,13 +165,11 @@ mod protocol;
 
 // Wait until `arti-client`'s dependency `x25519-dalek v1.2.0` is updated to a higher version. (#5492)
 // #[cfg(feature = "tor")]
-#[cfg(tor)]
-pub use crate::isolated::tor::connect_isolated_tor;
+// pub use crate::isolated::tor::connect_isolated_tor;
 
 // Wait until `arti-client`'s dependency `x25519-dalek v1.2.0` is updated to a higher version. (#5492)
 // #[cfg(all(feature = "tor", any(test, feature = "proptest-impl")))]
-#[cfg(tor)]
-pub use crate::isolated::tor::connect_isolated_tor_with_inbound;
+// pub use crate::isolated::tor::connect_isolated_tor_with_inbound;
 
 #[cfg(any(test, feature = "proptest-impl"))]
 pub use crate::{

zebrad/Cargo.toml

@@ -301,3 +301,6 @@ zebra-grpc = { path = "../zebra-grpc", version = "0.1.0-alpha.4" }
 # https://github.com/rust-lang/cargo/issues/9096
 # zebra-utils { path = "../zebra-utils", artifact = "bin:zebra-checkpoints" }
 zebra-utils = { path = "../zebra-utils", version = "1.0.0-beta.37" }
+
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(tokio_unstable)'] }