Update to the rustfmt in rust 1.31, which is now stable.

lib/wasm/src/environ/spec.rs

@@ -35,11 +35,7 @@ pub enum WasmError {
     ///
     /// This error code is used by a WebAssembly translator when it encounters invalid WebAssembly
     /// code. This should never happen for validated WebAssembly code.
-    #[fail(
-        display = "Invalid input WebAssembly code at offset {}: {}",
-        _1,
-        _0
-    )]
+    #[fail(display = "Invalid input WebAssembly code at offset {}: {}", _1, _0)]
     InvalidWebAssembly {
         /// A string describing the validation error.
         message: &'static str,

lib/wasm/src/lib.rs

@@ -12,10 +12,7 @@
 #![deny(missing_docs, trivial_numeric_casts, unused_extern_crates)]
 #![warn(unused_import_braces)]
 #![cfg_attr(feature = "std", deny(unstable_features))]
-#![cfg_attr(
-    feature = "clippy",
-    plugin(clippy(conf_file = "../../clippy.toml"))
-)]
+#![cfg_attr(feature = "clippy", plugin(clippy(conf_file = "../../clippy.toml")))]
 #![cfg_attr(
     feature = "cargo-clippy",
     allow(new_without_default, new_without_default_derive)