From c1233bbfdf60378e84c0e2651687e68dfaa4db7e Mon Sep 17 00:00:00 2001
From: Alex Helfet <alex.helfet@gmail.com>
Date: Mon, 25 Dec 2017 02:43:54 +0000
Subject: [PATCH] Fix build, add a comment.

---
 src/lib.rs   | 4 ++--
 src/typed.rs | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 0ac1df6..e834664 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -90,7 +90,7 @@ extern crate ref_slice;
 extern crate serde;
 
 #[macro_use]
-#[cfg(test)]
+#[cfg(all(test, feature = "typed"))]
 extern crate serde_derive;
 
 #[cfg(feature = "typed")]
@@ -105,7 +105,7 @@ pub mod error;
 #[allow(unused_imports)]
 use error::{Error, Result};
 
-#[cfg(feature = "typed")]
+#[cfg(all(feature = "typed", feature = "use_std"))]
 pub mod typed;
 
 // ## use statements
diff --git a/src/typed.rs b/src/typed.rs
index dce34ee..063b5ba 100644
--- a/src/typed.rs
+++ b/src/typed.rs
@@ -1,4 +1,6 @@
 //! Sending and receiving structs serialized with serde.
+//!
+//! This module currently requires `std`, the standard library.
 
 use error::{Result};
 use serde::Serialize;