Update to the latest stable rustfmt, 0.4.2-stable (febbb36 2018-04-12).

lib/frontend/src/frontend.rs

@@ -607,7 +607,6 @@ where
 #[cfg(test)]
 mod tests {
 
-    use Variable;
     use cretonne_codegen::entity::EntityRef;
     use cretonne_codegen::ir::types::*;
     use cretonne_codegen::ir::{AbiParam, ExternalName, Function, InstBuilder, Signature};
@@ -615,6 +614,7 @@ mod tests {
     use cretonne_codegen::settings::CallConv;
     use cretonne_codegen::verifier::verify_function;
     use frontend::{FunctionBuilder, FunctionBuilderContext};
+    use Variable;
 
     fn sample_function(lazy_seal: bool) {
         let mut sig = Signature::new(CallConv::SystemV);

lib/frontend/src/lib.rs

@@ -131,9 +131,13 @@
 #![warn(unused_import_braces)]
 #![cfg_attr(feature = "std", warn(unstable_features))]
 #![cfg_attr(feature = "cargo-clippy", allow(new_without_default))]
-#![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))]
+#![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
+    )
+)]
 #![cfg_attr(not(feature = "std"), no_std)]
 #![cfg_attr(not(feature = "std"), feature(alloc))]
 

lib/frontend/src/ssa.rs

@@ -712,7 +712,6 @@ where
 
 #[cfg(test)]
 mod tests {
-    use Variable;
     use cretonne_codegen::cursor::{Cursor, FuncCursor};
     use cretonne_codegen::entity::EntityRef;
     use cretonne_codegen::ir::instructions::BranchInfo;
@@ -721,6 +720,7 @@ mod tests {
     use cretonne_codegen::settings;
     use cretonne_codegen::verify_function;
     use ssa::SSABuilder;
+    use Variable;
 
     #[test]
     fn simple_block() {