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-rw-r--r--compiler/rustc_macros/src/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_macros/src/lib.rs b/compiler/rustc_macros/src/lib.rs
index eedc508fb14..c7b7eadbd9d 100644
--- a/compiler/rustc_macros/src/lib.rs
+++ b/compiler/rustc_macros/src/lib.rs
@@ -144,6 +144,7 @@ decl_derive!(
         help,
         note,
         warning,
+        subdiagnostic,
         suggestion,
         suggestion_short,
         suggestion_hidden,