Add patches and fix warning re: drop (#374)

Author: Pratyush

Cargo.toml

@@ -5,6 +5,8 @@ members = [
     "snark",
 ]
 
+resolver = "2"
+
 [profile.release]
 opt-level = 3
 lto = "thin"
@@ -29,3 +31,9 @@ lto = "thin"
 incremental = true
 debug-assertions = true
 debug = true
+
+[patch.crates-io]
+ark-ff = { git = "https://github.com/arkworks-rs/algebra/" }
+ark-ec = { git = "https://github.com/arkworks-rs/algebra/" }
+ark-poly = { git = "https://github.com/arkworks-rs/algebra/" }
+ark-serialize = { git = "https://github.com/arkworks-rs/algebra/" }

relations/src/r1cs/constraint_system.rs

@@ -736,7 +736,7 @@ impl<F: Field> Drop for Namespace<F> {
         if let Some(id) = self.id.as_ref() {
             tracing::dispatcher::get_default(|dispatch| dispatch.exit(id))
         }
-        drop(&mut self.inner)
+        let _ = self.inner;
     }
 }