I tried this (admittedly cursed) code:

thread_local! { pub static FOO: [(); { #[unsafe(no_mangle)] fn dont_duplicate_me() {} 0 }] = []; }

I expected to see this happen: It compiles, just like the non-thread_local! version would

Instead, this happened:

error: symbol `dont_duplicate_me` is already defined --> src/lib.rs:4:9 | 4 | fn dont_duplicate_me() {} | ^^^^^^^^^^^^^^^^^^^^^^ 

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rustc --version:

1.92.0-nightly (2025-09-26 54a8a1db604e4caff93e) 

@rustbot label T-libs A-macros A-thread-locals A-const-generics