Enable and fix several more clippy lints.

lib/faerie/src/backend.rs

@@ -270,7 +270,7 @@ impl<'a> RelocSink for FaerieRelocSink<'a> {
             &self.namespace.get_data_decl(name).name
         };
         let addend_i32 = addend as i32;
-        debug_assert!(addend_i32 as i64 == addend);
+        debug_assert!(i64::from(addend_i32) == addend);
         let raw_reloc = container::raw_relocation(reloc, self.format);
         self.artifact
             .link_with(

lib/faerie/src/lib.rs

@@ -3,6 +3,20 @@
 //! Users of this module should not have to depend on faerie directly.
 
 #![deny(missing_docs, trivial_numeric_casts, unused_extern_crates)]
+#![warn(unused_import_braces, unstable_features)]
+#![cfg_attr(feature = "clippy", plugin(clippy(conf_file = "../../clippy.toml")))]
+#![cfg_attr(feature = "cargo-clippy",
+            allow(new_without_default, new_without_default_derive))]
+#![cfg_attr(feature="cargo-clippy", warn(
+                float_arithmetic,
+                mut_mut,
+                nonminimal_bool,
+                option_map_unwrap_or,
+                option_map_unwrap_or_else,
+                print_stdout,
+                unicode_not_nfc,
+                use_self,
+                ))]
 
 extern crate cretonne_codegen;
 extern crate cretonne_module;