Update to the rustfmt in rust 1.29, which is now stable.

lib/codegen/src/lib.rs

@@ -3,7 +3,10 @@
 #![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(
 // This requires Rust 1.27 or later.
                 duration_subsec,
@@ -32,8 +35,14 @@
 #![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
+        float_arithmetic,
+        mut_mut,
+        nonminimal_bool,
+        option_map_unwrap_or,
+        option_map_unwrap_or_else,
+        print_stdout,
+        unicode_not_nfc,
+        use_self
     )
 )]
 // Turns on no_std and alloc features if std is not available.