annotation fixes - no_std in libboard_artiq

src/libboard_artiq/src/lib.rs

@@ -1,3 +1,5 @@
+#![no_std]
+
 // has csr; taken from runtime main
 #[path = "../../../build/pl.rs"]
 pub mod pl;

src/libio/lib.rs

@@ -21,6 +21,7 @@ pub use proto::{ProtoRead, ProtoWrite};
 #[cfg(all(feature = "byteorder", feature = "alloc"))]
 pub use proto::ReadStringError;
 
+#[derive(Debug, Clone, PartialEq)]
 pub enum Error<T> {
     UnexpectedEnd,
     Other(T)