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-rw-r--r--src/librustc_feature/active.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/librustc_feature/active.rs b/src/librustc_feature/active.rs
index 91a84f711f2..123188944b2 100644
--- a/src/librustc_feature/active.rs
+++ b/src/librustc_feature/active.rs
@@ -61,7 +61,7 @@ macro_rules! declare_features {
                 match feature {
                     $( sym::$feature => &self.$feature, )*
 
-                    _ => panic!("{} was not defined in `declare_features`", feature),
+                    _ => panic!("`{}` was not listed in `declare_features`", feature),
                 }
             }
         }