From 299e8a9737259e6fd8052f3e520533f8fc3cd7f9 Mon Sep 17 00:00:00 2001
From: Lachlan Sneff <lachlan.sneff@gmail.com>
Date: Mon, 15 Jan 2018 16:21:26 -0500
Subject: [PATCH] lib/cretonne works with no_std

---
 lib/cretonne/Cargo.toml | 5 ++++-
 lib/cretonne/src/dbg.rs | 1 +
 lib/cretonne/src/lib.rs | 7 +++----
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/lib/cretonne/Cargo.toml b/lib/cretonne/Cargo.toml
index 91dc6ccdac..0cf3fffd9b 100644
--- a/lib/cretonne/Cargo.toml
+++ b/lib/cretonne/Cargo.toml
@@ -20,8 +20,11 @@ name = "cretonne"
 [dependencies.hashmap_core]
 version = "0.1.1"
 optional = true
+[dependencies.error_core]
+version = "0.1.0"
+optional = true
 
 [features]
 # Currently, the only feature is the `no_std` feature.
 # Enabling this disables use of `stdlib`.
-no_std = ["hashmap_core"]
\ No newline at end of file
+no_std = ["hashmap_core", "error_core"]
\ No newline at end of file
diff --git a/lib/cretonne/src/dbg.rs b/lib/cretonne/src/dbg.rs
index cb8dd07118..7e5cd2777c 100644
--- a/lib/cretonne/src/dbg.rs
+++ b/lib/cretonne/src/dbg.rs
@@ -9,6 +9,7 @@
 /// The output will appear in files named `cretonne.dbg.*`, where the suffix is named after the
 /// thread doing the logging.
 
+#[cfg(not(feature = "no_std"))]
 use std::cell::RefCell;
 #[cfg(not(feature = "no_std"))]
 use std::env;
diff --git a/lib/cretonne/src/lib.rs b/lib/cretonne/src/lib.rs
index 2bed9df4fb..c448cc1d0f 100644
--- a/lib/cretonne/src/lib.rs
+++ b/lib/cretonne/src/lib.rs
@@ -9,6 +9,8 @@
 #[cfg(feature = "no_std")]
 extern crate hashmap_core;
 #[cfg(feature = "no_std")]
+extern crate error_core;
+#[cfg(feature = "no_std")]
 #[macro_use]
 extern crate alloc;
 
@@ -72,9 +74,6 @@ mod std {
         pub use alloc::BTreeSet;
     }
     pub mod error {
-        pub trait Error {
-            fn description(&self) -> &str;
-            fn cause(&self) -> Option<&Error> { None }
-        }
+        pub use error_core::Error;
     }
 }
\ No newline at end of file