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158a3b7211
With all the new files in place and ready from the new crate, enable the support for it in the build system. `proc_macro_byte_character` and `proc_macro_c_str_literals` were stabilized in Rust 1.79.0 [1] and were implemented earlier than our minimum Rust version (1.78) [2][3]. Thus just enable them instead of using the `cfg` that `proc-macro2` uses to emulate them in older compilers. In addition, skip formatting for this vendored crate and take the chance to add a comment mentioning this. Link: https://github.com/rust-lang/rust/pull/123431 [1] Link: https://github.com/rust-lang/rust/pull/112711 [2] Link: https://github.com/rust-lang/rust/pull/119651 [3] Reviewed-by: Gary Guo <gary@garyguo.net> Tested-by: Gary Guo <gary@garyguo.net> Tested-by: Jesung Yang <y.j3ms.n@gmail.com> Link: https://patch.msgid.link/20251124151837.2184382-11-ojeda@kernel.org Signed-off-by: Miguel Ojeda <ojeda@kernel.org>