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papyrus depends on proc-macro2 and syn which contains features that are only available on a nightly compiler. Further to this, the features are underneath a config flag, so compiling requires the RUSTFLAGS environment variable to include --cfg procmacro2_semver_exempt.

Linux, Mac

RUSTFLAGS="--cfg procmacro2_semver_exempt" cargo install papyrus

Windows

$env:RUSTFLAGS="--cfg procmacro2_semver_exempt"
cargo install papyrus;