Fix logging (#587)

* Fix logging

* Add error info

substrate/substrate/executor/src/native_executor.rs

@@ -65,7 +65,10 @@ fn fetch_cached_runtime_version<'a, E: Externalities<KeccakHasher>>(
 					.and_then(|v| RuntimeVersion::decode(&mut v.as_slice()));
 				RuntimePreproc::ValidCode(module, version)
 			}
-			Err(_) => RuntimePreproc::InvalidCode,
+			Err(e) => {
+				trace!(target: "executor", "Invalid code presented to executor ({:?})", e);
+				RuntimePreproc::InvalidCode
+			}
 		});
 	match maybe_runtime_preproc {
 		RuntimePreproc::InvalidCode => Err(ErrorKind::InvalidCode(code.into()).into()),

substrate/substrate/state-machine/src/lib.rs

@@ -370,7 +370,7 @@ where
 			};
 
 			if (result.is_ok() && wasm_result.is_ok() && result.as_ref().unwrap() == wasm_result.as_ref().unwrap()/* && delta == wasm_delta*/)
-				|| (result.is_err() && wasm_result.is_err() && format!("{}", result.as_ref().unwrap_err()) == format!("{}", wasm_result.as_ref().unwrap_err()))
+				|| (result.is_err() && wasm_result.is_err())
 			{
 				(result, delta)
 			} else {