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1e4bde1cb9
Actually use TAIT instead of emulating it `core`'s `impl_fn_for_zst` macro is just a hacky way of emulating TAIT. TAIT has become stable enough to be used [in other places](https://github.com/rust-lang/rust/blob/e8fbd991287f637f95016a71ddc13438415bbe59/library/std/src/backtrace.rs#L431) inside the standard library, so let's use it in `core` as well.