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-rw-r--r--src/librustc_feature/active.rs3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/librustc_feature/active.rs b/src/librustc_feature/active.rs
index 20357e5581a..08b65aff7c9 100644
--- a/src/librustc_feature/active.rs
+++ b/src/librustc_feature/active.rs
@@ -53,6 +53,9 @@ macro_rules! declare_features {
                 $(f(stringify!($feature), self.$feature);)+
             }
 
+            /// Is the given feature enabled?
+            ///
+            /// Panics if the symbol doesn't correspond to a declared feature.
             pub fn enabled(&self, feature: Symbol) -> bool {
                 match feature {
                     $( sym::$feature => self.$feature, )*