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-rw-r--r--compiler/rustc_error_messages/src/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_error_messages/src/lib.rs b/compiler/rustc_error_messages/src/lib.rs
index a6fbbb29ccd..066546ecf74 100644
--- a/compiler/rustc_error_messages/src/lib.rs
+++ b/compiler/rustc_error_messages/src/lib.rs
@@ -208,6 +208,7 @@ pub type LazyFallbackBundle = Arc<LazyLock<FluentBundle, impl FnOnce() -> Fluent
 
 /// Return the default `FluentBundle` with standard "en-US" diagnostic messages.
 #[instrument(level = "trace", skip(resources))]
+#[cfg_attr(not(bootstrap), define_opaque(LazyFallbackBundle))]
 pub fn fallback_fluent_bundle(
     resources: Vec<&'static str>,
     with_directionality_markers: bool,