Fixing serde overflow error (#1977)

json/src/hash.rs

@@ -48,10 +48,10 @@ macro_rules! impl_hash {
 							0 => $inner::from(0),
 							2 if value == "0x" => $inner::from(0),
 							_ if value.starts_with("0x") => try!($inner::from_str(&value[2..]).map_err(|_| {
-								Error::custom(format!("Invalid hex value {}.", value).as_ref())
+								Error::custom(format!("Invalid hex value {}.", value))
 							})),
 							_ => try!($inner::from_str(value).map_err(|_| {
-								Error::custom(format!("Invalid hex value {}.", value).as_ref())
+								Error::custom(format!("Invalid hex value {}.", value))
 							}))
 						};
 

json/src/uint.rs

@@ -70,10 +70,10 @@ impl Visitor for UintVisitor {
 			0 => U256::from(0),
 			2 if value.starts_with("0x") => U256::from(0),
 			_ if value.starts_with("0x") => try!(U256::from_str(&value[2..]).map_err(|_| {
-				Error::custom(format!("Invalid hex value {}.", value).as_ref())
+				Error::custom(format!("Invalid hex value {}.", value))
 			})),
 			_ => try!(U256::from_dec_str(value).map_err(|_| {
-				Error::custom(format!("Invalid decimal value {}.", value).as_ref())
+				Error::custom(format!("Invalid decimal value {}.", value))
 			}))
 		};
 

rpc/src/v1/types/trace.rs

@@ -99,6 +99,7 @@ pub struct VMOperation {
 	/// Information concerning the execution of the operation.
 	pub ex: Option<VMExecutedOperation>,
 	/// Subordinate trace of the CALL/CREATE if applicable.
+	#[serde(bound="VMTrace: Serialize")]
 	pub sub: Option<VMTrace>,
 }