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-rw-r--r--src/libcore/ops/function.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libcore/ops/function.rs b/src/libcore/ops/function.rs
index 2cdfee87a35..22a738d0bc1 100644
--- a/src/libcore/ops/function.rs
+++ b/src/libcore/ops/function.rs
@@ -224,7 +224,7 @@ pub trait FnMut<Args>: FnOnce<Args> {
 #[must_use = "closures are lazy and do nothing unless called"]
 pub trait FnOnce<Args> {
     /// The returned type after the call operator is used.
-    #[cfg_attr(not(bootstrap), lang = "fn_once_output")]
+    #[lang = "fn_once_output"]
     #[stable(feature = "fn_once_output", since = "1.12.0")]
     type Output;