lib/cretonne works with no_std

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_std = ["hashmap_core", "error_core"]

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;

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;
     }
 }