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22e4575672
Stabilize `fmt::from_fn` Resolves rust-lang/rust#146705, pending its FCP. As discussed in that tracking issue and rust-lang/rust#117729, this splits `fmt::from_fn` out from the `debug_closure_helpers` feature.
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.