The R package foresightr bundles the source of the Rust crates below (in
src/rust/vendor.tar.xz); the compiled library contains code from them. Their
authors and licenses, as declared by each crate:

extendr-api 0.9.0
  Authors:    The extendr developers
  License:    MIT
  Repository: https://github.com/extendr/extendr

extendr-ffi 0.9.0
  Authors:    The extendr developers
  License:    MIT
  Repository: https://github.com/extendr/extendr

extendr-macros 0.9.0
  Authors:    The extendr developers
  License:    MIT
  Repository: https://github.com/extendr/extendr

foresight 0.7.3
  Authors:    André Leite, Hugo Vasconcelos, Raydonal Ospina
  License:    MIT
  Repository: https://github.com/milkway/foresight

lazy_static 1.5.0
  Authors:    Marvin Löbel
  License:    MIT OR Apache-2.0
  Repository: https://github.com/rust-lang-nursery/lazy-static.rs

once_cell 1.21.4
  Authors:    Aleksey Kladov
  License:    MIT OR Apache-2.0
  Repository: https://github.com/matklad/once_cell

paste 1.0.15
  Authors:    David Tolnay
  License:    MIT OR Apache-2.0
  Repository: https://github.com/dtolnay/paste

proc-macro2 1.0.107
  Authors:    David Tolnay, Alex Crichton
  License:    MIT OR Apache-2.0
  Repository: https://github.com/dtolnay/proc-macro2

quote 1.0.47
  Authors:    David Tolnay
  License:    MIT OR Apache-2.0
  Repository: https://github.com/dtolnay/quote

readonly 0.2.14
  Authors:    David Tolnay
  License:    MIT OR Apache-2.0
  Repository: https://github.com/dtolnay/readonly

syn 2.0.119
  Authors:    David Tolnay
  License:    MIT OR Apache-2.0
  Repository: https://github.com/dtolnay/syn

syn 3.0.6
  Authors:    David Tolnay
  License:    MIT OR Apache-2.0
  Repository: https://github.com/dtolnay/syn

unicode-ident 1.0.26
  Authors:    David Tolnay
  License:    (MIT OR Apache-2.0) AND Unicode-3.0
  Repository: https://github.com/dtolnay/unicode-ident