Deny unused crate dependencies (use-ink#584)

* Deny unused crate dependencies

* Deny unused crate dependencies

* Remove ink_lang_codegen

Cargo.toml

@@ -56,13 +56,11 @@ sp-core = "6.0.0"
 sp-runtime = "6.0.0"
 pallet-contracts-primitives = "6.0.0"
 subxt = "0.21.0"
-futures = "0.3.19"
 hex = "0.4.3"
 jsonrpsee = { version = "0.13.1", features = ["ws-client"] }
 nom = "7.1.1"
 nom-supreme = { version = "0.7.0", features = ["error"] }
 indexmap = "1.8.1"
-thiserror = "1.0.31"
 escape8259 = "0.5.1"
 itertools = "0.10.3"
 
@@ -86,7 +84,6 @@ predicates = "2.1.1"
 ink_primitives = "3"
 ink_storage = "3"
 ink_lang = "3"
-ink_lang_codegen = "3"
 
 [features]
 # This `std` feature is required for testing using an inline contract's metadata, because `ink!` annotates the metadata

metadata/lib.rs

@@ -52,6 +52,8 @@
 //! let json = serde_json::to_value(&metadata).unwrap();
 //! ```
 
+#![deny(unused_crate_dependencies)]
+
 mod byte_str;
 
 use semver::Version;

src/main.rs

@@ -14,6 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with cargo-contract.  If not, see <http://www.gnu.org/licenses/>.
 
+#![deny(unused_crate_dependencies)]
+
 mod cmd;
 mod crate_metadata;
 mod util;