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-rw-r--r--compiler/rustc_expand/src/errors.rs10
1 files changed, 10 insertions, 0 deletions
diff --git a/compiler/rustc_expand/src/errors.rs b/compiler/rustc_expand/src/errors.rs
index a5fc9e9d89c..3f8b4661e5f 100644
--- a/compiler/rustc_expand/src/errors.rs
+++ b/compiler/rustc_expand/src/errors.rs
@@ -440,3 +440,13 @@ pub(crate) struct EmptyDelegationList {
     #[primary_span]
     pub span: Span,
 }
+
+// This used to be the `proc_macro_back_compat` lint (#83125). It was later
+// turned into a hard error.
+#[derive(Diagnostic)]
+#[diag(expand_proc_macro_back_compat)]
+#[note]
+pub struct ProcMacroBackCompat {
+    pub crate_name: String,
+    pub fixed_version: String,
+}