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-rw-r--r--compiler/rustc_feature/src/removed.rs6
1 files changed, 6 insertions, 0 deletions
diff --git a/compiler/rustc_feature/src/removed.rs b/compiler/rustc_feature/src/removed.rs
index f13aa506c1e..80a108d2fc8 100644
--- a/compiler/rustc_feature/src/removed.rs
+++ b/compiler/rustc_feature/src/removed.rs
@@ -32,6 +32,12 @@ declare_features! (
     // feature-group-start: removed features
     // -------------------------------------------------------------------------
 
+    // Note that the version indicates when it got *removed*.
+    // When moving an unstable feature here, set the version number to
+    // `CURRENT RUSTC VERSION` with ` ` replaced by `_`.
+    // (But not all features below do this properly; many indicate the
+    // version they got originally added in.)
+
     /// Allows using the `amdgpu-kernel` ABI.
     (removed, abi_amdgpu_kernel, "1.77.0", Some(51575), None),
     (removed, advanced_slice_patterns, "1.0.0", Some(62254),