Sorted errors and fixed wasm build

Cargo.toml

@@ -89,3 +89,7 @@ travis-ci = { repository = "paritytech/polkadot", branch = "master" }
 maintenance = { status = "actively-developed" }
 is-it-maintained-issue-resolution = { repository = "paritytech/polkadot" }
 is-it-maintained-open-issues = { repository = "paritytech/polkadot" }
+
+[profile.release]
+# Substrate runtime requires unwinding.
+panic = "unwind" 

substrate/client/src/block_builder.rs

@@ -94,11 +94,11 @@ impl<B, E, Block> BlockBuilder<B, E, Block> where
 					}
 					Some(Err(e)) => {
 						self.changes.discard_prospective();
-						Err(error::ErrorKind::Runtime(e).into())
+						Err(error::ErrorKind::ApplyExtinsicFailed(e).into())
 					}
 					None => {
 						self.changes.discard_prospective();
-						Err(error::ErrorKind::ApplyExtinsicFailed.into())
+						Err(error::ErrorKind::CallResultDecode("apply_extrinsic").into())
 					}
 				}
 			}

substrate/client/src/error.rs

@@ -35,8 +35,8 @@ error_chain! {
 			display("UnknownBlock: {}", &*h),
 		}
 
-		/// Extrinsic error.
-		Runtime(e: ApplyError) {
+		/// Applying extrinsic error.
+		ApplyExtinsicFailed(e: ApplyError) {
 			description("Extrinsic error"),
 			display("Extrinsic error: {:?}", e),
 		}
@@ -119,10 +119,10 @@ error_chain! {
 			display("Remote data fetch has been failed"),
 		}
 
-		/// Error decoding extrinsic outcome.
-		ApplyExtinsicFailed {
-			description("Error decoding extrinsic outcome"),
-			display("Error decoding extrinsic outcome."),
+		/// Error decoding call result.
+		CallResultDecode(method: &'static str) {
+			description("Error decoding call result")
+			display("Error decoding call result of {}", method)
 		}
 	}
 }

substrate/test-runtime/src/system.rs

@@ -73,7 +73,7 @@ pub fn execute_block(block: Block) {
 	assert!(header.extrinsics_root == txs_root, "Transaction trie root must be valid.");
 
 	// execute transactions
-	block.extrinsics.iter().for_each(|e| { execute_transaction_backend(e).expect("Extrinsic error"); });
+	block.extrinsics.iter().for_each(|e| { execute_transaction_backend(e).map_err(|_| ()).expect("Extrinsic error"); });
 
 	// check storage root.
 	let storage_root = storage_root().into();