Lrc<Box<dyn CodegenBackend>>
Because `Lrc<Box<T>>` is silly. (Clippy warns about `Rc<Box<T>>` and `Arc<Box<T>>`, and it would warn here if (a) we used Clippy with rustc, and (b) Clippy knew about `Lrc`.)
tls::enter_context
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rustc_fluent_macro
rustc_macros