simplified trace from functions, removed clippy warnings

ethcore/src/action_params.rs

@@ -27,6 +27,15 @@ pub enum ActionValue {
 	Apparent(U256)
 }
 
+impl ActionValue {
+	/// Returns action value as U256.
+	pub fn value(&self) -> U256 {
+		match *self {
+			ActionValue::Transfer(x) | ActionValue::Apparent(x) => x
+		}
+	}
+}
+
 // TODO: should be a trait, possible to avoid cloning everything from a Transaction(/View).
 /// Action (call/create) input params. Everything else should be specified in Externalities.
 #[derive(Clone, Debug)]

ethcore/src/trace.rs

@@ -90,9 +90,9 @@ impl TraceAction {
 		TraceAction::Call(TraceCall {
 			from: p.sender.clone(),
 			to: p.address.clone(),
-			value: match p.value { ActionValue::Transfer(ref x) | ActionValue::Apparent(ref x) => x.clone() },
-			gas: p.gas.clone(),
-			input: p.data.clone().unwrap_or(vec![]),
+			value: p.value.value(),
+			gas: p.gas,
+			input: p.data.clone().unwrap_or_else(Vec::new),
 			result: None,
 		})
 	}
@@ -101,9 +101,9 @@ impl TraceAction {
 	pub fn from_create(p: &ActionParams) -> TraceAction {
 		TraceAction::Create(TraceCreate {
 			from: p.sender.clone(),
-			value: match p.value { ActionValue::Transfer(ref x) | ActionValue::Apparent(ref x) => x.clone() },
-			gas: p.gas.clone(),
-			init: p.code.clone().unwrap_or(vec![]),
+			value: p.value.value(),
+			gas: p.gas,
+			init: p.code.clone().unwrap_or_else(Vec::new),
 			result: None,
 		})
 	}