diff --git a/src/librustc/session/config.rs b/src/librustc/session/config.rs
index d866ead8e3b6c..87f0c8b67a0ec 100644
--- a/src/librustc/session/config.rs
+++ b/src/librustc/session/config.rs
@@ -1572,7 +1572,8 @@ pub mod nightly_options {
 
     pub fn check_nightly_options(matches: &getopts::Matches, flags: &[RustcOptGroup]) {
         let has_z_unstable_option = matches.opt_strs("Z").iter().any(|x| *x == "unstable-options");
-        let really_allows_unstable_options = UnstableFeatures::from_environment().is_nightly_build();
+        let really_allows_unstable_options = UnstableFeatures::from_environment()
+            .is_nightly_build();
 
         for opt in flags.iter() {
             if opt.stability == OptionStability::Stable {
diff --git a/src/librustc_driver/lib.rs b/src/librustc_driver/lib.rs
index df2219b73cd81..5089af892859b 100644
--- a/src/librustc_driver/lib.rs
+++ b/src/librustc_driver/lib.rs
@@ -649,7 +649,8 @@ impl RustcDefaultCalls {
                     }
                 }
                 PrintRequest::Cfg => {
-                    let allow_unstable_cfg = UnstableFeatures::from_environment().is_nightly_build();
+                    let allow_unstable_cfg = UnstableFeatures::from_environment()
+                        .is_nightly_build();
 
                     for cfg in cfg {
                         if !allow_unstable_cfg && GatedCfg::gate(&*cfg).is_some() {