hack to get the tests to work. see rust-lang/cargo#879

test/build.rs

@@ -1,5 +1,27 @@
 extern crate capnpc;
 
 fn main() {
-    ::capnpc::compile(Path::new("."), [Path::new("test.capnp")]);
+
+    // See https://github.com/rust-lang/cargo/issues/879
+    //::capnpc::compile(Path::new("."), [Path::new("test.capnp")]);
+
+    let mut command = ::std::io::Command::new("capnp");
+    command
+        .arg("compile")
+        .arg("-o/bin/cat")
+        .arg("test.capnp");
+
+    command.stdout(::std::io::process::CreatePipe(false, true));
+
+    match command.spawn() {
+        Ok(ref mut p) =>  {
+            let mut child_stdout = p.stdout.take().unwrap();
+            ::capnpc::codegen::main(&mut child_stdout).unwrap();
+            p.wait().unwrap();
+        }
+        Err(e) => {
+            panic!("could not start process: {}", e);
+        }
+    }
+
 }

test/test.rs

@@ -10,7 +10,9 @@ extern crate capnp;
 
 #[allow(overflowing_literals)]
 pub mod test_capnp {
-  include!(concat!(env!("OUT_DIR"), "/test_capnp.rs"))
+// See https://github.com/rust-lang/cargo/issues/879
+//  include!(concat!(env!("OUT_DIR"), "/test_capnp.rs"))
+  include!("test_capnp.rs")
 }
 
 #[cfg(test)]