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-rw-r--r--compiler/rustc_middle/src/error.rs1
1 files changed, 0 insertions, 1 deletions
diff --git a/compiler/rustc_middle/src/error.rs b/compiler/rustc_middle/src/error.rs
index 0be26712b9c..3ff9eea8cc4 100644
--- a/compiler/rustc_middle/src/error.rs
+++ b/compiler/rustc_middle/src/error.rs
@@ -37,7 +37,6 @@ pub(crate) struct OpaqueHiddenTypeMismatch<'tcx> {
     pub sub: TypeMismatchReason,
 }
 
-// FIXME(autodiff): I should get used somewhere
 #[derive(Diagnostic)]
 #[diag(middle_unsupported_union)]
 pub struct UnsupportedUnion {