avoid unwraps

ipc/codegen/Cargo.toml

@@ -15,7 +15,7 @@ with-syntex = ["quasi/with-syntex", "quasi_codegen", "quasi_codegen/with-syntex"
 
 [build-dependencies]
 quasi_codegen = { version = "0.11", optional = true }
-syntex = { version = "*", optional = true }
+syntex = { version = "0.33", optional = true }
 
 [dependencies]
 aster = { version = "0.17", default-features = false }

ipc/codegen/src/serialization.rs

@@ -89,7 +89,7 @@ fn serialize_item(
 	let (size_expr, read_expr, write_expr) =
 		(binary_expressions.size, binary_expressions.read, binary_expressions.write);
 
-	Ok(quote_item!(cx,
+	match quote_item!(cx,
 		impl $generics ::ipc::BinaryConvertable for $ty $where_clause {
 			fn size(&self) -> usize {
 				$size_expr
@@ -106,8 +106,16 @@ fn serialize_item(
 			fn len_params() -> usize {
 				1
 			}
-        }
-    ).unwrap())
+        })
+	{
+		Some(item) => Ok(item),
+		None => {
+			cx.span_err(
+				item.span,
+				"syntax error expanding serialization implementation");
+			Err(Error)
+		}
+	}
 }
 
 #[allow(unreachable_code)]

ipc/tests/build.rs

@@ -19,20 +19,20 @@ extern crate ethcore_ipc_codegen as codegen;
 
 use std::env;
 use std::path::Path;
+use std::process::exit;
 
 pub fn main() {
 	let out_dir = env::var_os("OUT_DIR").unwrap();
 
-	// ipc pass
-	{
+	// rpc pass
+	if {
 		let src = Path::new("nested.rs.in");
 		let dst = Path::new(&out_dir).join("nested_ipc.rs");
 		let mut registry = syntex::Registry::new();
 		codegen::register(&mut registry);
-		registry.expand("", &src, &dst).unwrap();
+		registry.expand("", &src, &dst).is_ok()
 	}
-
-	// serde pass
+	// serialization pass
 	{
 		let src = Path::new(&out_dir).join("nested_ipc.rs");
 		let dst = Path::new(&out_dir).join("nested_cg.rs");
@@ -41,16 +41,15 @@ pub fn main() {
 		registry.expand("", &src, &dst).unwrap();
 	}
 
-	// ipc pass
-	{
+	// rpc pass
+	if {
 		let src = Path::new("service.rs.in");
 		let dst = Path::new(&out_dir).join("service_ipc.rs");
 		let mut registry = syntex::Registry::new();
 		codegen::register(&mut registry);
-		registry.expand("", &src, &dst).unwrap();
+		registry.expand("", &src, &dst).is_ok()
 	}
-
-	// serde pass
+	// serialization pass
 	{
 		let src = Path::new(&out_dir).join("service_ipc.rs");
 		let dst = Path::new(&out_dir).join("service_cg.rs");
@@ -59,13 +58,15 @@ pub fn main() {
 		registry.expand("", &src, &dst).unwrap();
 	}
 
-
-	// ipc pass
+	// rpc pass
 	{
 		let src = Path::new("binary.rs.in");
 		let dst = Path::new(&out_dir).join("binary.rs");
 		let mut registry = syntex::Registry::new();
 		codegen::register(&mut registry);
-		registry.expand("", &src, &dst).unwrap();
+		if let Err(err_msg) = registry.expand("", &src, &dst) {
+			println!("error: {}", err_msg);
+			exit(1);
+		}
 	}
 }