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We don't use these features directly (proc-macro2 does though) and they've recently been stabilized and expected for 1.79. Looking at rust-lang/rust#115268 I see that other's are experiencing this.
Are you on nightly? If so, please update your nightly toolchain
cargo install cargo-binutils :
error[E0658]: use of unstable library feature 'proc_macro_byte_character'
error[E0658]: use of unstable library feature 'proc_macro_c_str_literals'
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