error: linking with `cc` failed: exit status: 1
  |
  = note: LC_ALL="C" cc -m64 /tmp/rustcPYQ6e2/symbols.o target/release/deps/test_precedence-6bd9c16ceacbfa39.test_precedence.516dd8336f7f7b26-cgu.00.rcgu.o target/release/deps/test_precedence-6bd9c16ceacbfa39.test_precedence.516dd8336f7f7b26-cgu.01.rcgu.o target/release/deps/test_precedence-6bd9c16ceacbfa39.test_precedence.516dd8336f7f7b26-cgu.02.rcgu.o target/release/deps/test_precedence-6bd9c16ceacbfa39.test_precedence.516dd8336f7f7b26-cgu.03.rcgu.o target/release/deps/test_precedence-6bd9c16ceacbfa39.test_precedence.516dd8336f7f7b26-cgu.04.rcgu.o target/release/deps/test_precedence-6bd9c16ceacbfa39.test_precedence.516dd8336f7f7b26-cgu.05.rcgu.o target/release/deps/test_precedence-6bd9c16ceacbfa39.test_precedence.516dd8336f7f7b26-cgu.06.rcgu.o target/release/deps/test_precedence-6bd9c16ceacbfa39.test_precedence.516dd8336f7f7b26-cgu.07.rcgu.o target/release/deps/test_precedence-6bd9c16ceacbfa39.test_precedence.516dd8336f7f7b26-cgu.08.rcgu.o target/release/deps/test_precedence-6bd9c16ceacbfa39.test_precedence.516dd8336f7f7b26-cgu.09.rcgu.o target/release/deps/test_precedence-6bd9c16ceacbfa39.test_precedence.516dd8336f7f7b26-cgu.10.rcgu.o target/release/deps/test_precedence-6bd9c16ceacbfa39.test_precedence.516dd8336f7f7b26-cgu.11.rcgu.o target/release/deps/test_precedence-6bd9c16ceacbfa39.test_precedence.516dd8336f7f7b26-cgu.12.rcgu.o target/release/deps/test_precedence-6bd9c16ceacbfa39.test_precedence.516dd8336f7f7b26-cgu.13.rcgu.o target/release/deps/test_precedence-6bd9c16ceacbfa39.test_precedence.516dd8336f7f7b26-cgu.14.rcgu.o target/release/deps/test_precedence-6bd9c16ceacbfa39.test_precedence.516dd8336f7f7b26-cgu.15.rcgu.o -Wl,--as-needed -L target/release/deps -L ~/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib -Wl,-Bstatic target/release/deps/libreqwest-8f37388bf1e63fc8.rlib target/release/deps/librustls_pemfile-14952b380480d6bc.rlib 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target/release/deps/libhttp-62da6d27a134a4f7.rlib target/release/deps/libitoa-528a566125096185.rlib target/release/deps/libbytes-9966e59c6c110266.rlib target/release/deps/libfnv-82d0a40bbfed6e3d.rlib ~/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libtest-0cd255ee414ee1b7.rlib ~/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgetopts-d94d981cfad2e302.rlib ~/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunicode_width-bc5c85135ebc2d28.rlib ~/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_std-a783581261810918.rlib target/release/deps/libwalkdir-647cf2784a95b552.rlib target/release/deps/libsame_file-8a8cd61a6dfc5da4.rlib target/release/deps/libtar-05eaddab41c1519f.rlib target/release/deps/libxattr-3d63de4a63cd9eb5.rlib target/release/deps/librustix-78af8e3220ae7e77.rlib 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target/release/deps/libquote-6a37428a9e58049a.rlib target/release/deps/libproc_macro2-5a8ce56bdd6d2d2b.rlib target/release/deps/libunicode_ident-2651529e20c4ca92.rlib -L ~/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib -Wl,-Bdynamic -lrustc_driver-aa61d155f58600fb -L ~/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib -lstd-41777efa78699460 -Wl,-Bstatic ~/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-b7903030bc1640bf.rlib -Wl,-Bdynamic -lssl -lcrypto -lLLVM-18-rust-1.78.0-nightly -ldl -lgcc_s -lutil -lrt -lpthread -lm -ldl -lc -Wl,--eh-frame-hdr -Wl,-z,noexecstack -L ~/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib -o target/release/deps/test_precedence-6bd9c16ceacbfa39 -Wl,--gc-sections -pie -Wl,-z,relro,-z,now -Wl,-O1 -Wl,--strip-debug -nodefaultlibs
  = note: /usr/bin/ld: cannot find -lLLVM-18-rust-1.78.0-nightly: No such file or directory
          collect2: error: ld returned 1 exit status

    warning: item in documentation is missing backticks
     --> tests/test_precedence.rs:3:40
      |
    3 | //! 1. Parse the file using syn into a syn::File.
      |                                        ^^^^^^^^^
      |
      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#doc_markdown
      = note: `-W clippy::doc-markdown` implied by `-W clippy::pedantic`
      = help: to override `-W clippy::pedantic` add `#[allow(clippy::doc_markdown)]`
    help: try
      |
    3 | //! 1. Parse the file using syn into a `syn::File`.
      |                                        ~~~~~~~~~~~

    warning: item in documentation is missing backticks
     --> tests/test_precedence.rs:4:22
      |
    4 | //! 2. Extract every syn::Expr from the file.
      |                      ^^^^^^^^^
      |
      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#doc_markdown
    help: try
      |
    4 | //! 2. Extract every `syn::Expr` from the file.
      |                      ~~~~~~~~~~~

    warning: item in documentation is missing backticks
     --> tests/test_precedence.rs:6:36
      |
    6 | //! 4. Parse the source code using librustc_parse into a rustc_ast::Expr.
      |                                    ^^^^^^^^^^^^^^
      |
      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#doc_markdown
    help: try
      |
    6 | //! 4. Parse the source code using `librustc_parse` into a rustc_ast::Expr.
      |                                    ~~~~~~~~~~~~~~~~

    warning: item in documentation is missing backticks
     --> tests/test_precedence.rs:6:58
      |
    6 | //! 4. Parse the source code using librustc_parse into a rustc_ast::Expr.
      |                                                          ^^^^^^^^^^^^^^^
      |
      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#doc_markdown
    help: try
      |
    6 | //! 4. Parse the source code using librustc_parse into a `rustc_ast::Expr`.
      |                                                          ~~~~~~~~~~~~~~~~~

    warning: item in documentation is missing backticks
     --> tests/test_precedence.rs:7:21
      |
    7 | //! 5. For both the syn::Expr and rustc_ast::Expr, crawl the syntax tree to
      |                     ^^^^^^^^^
      |
      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#doc_markdown
    help: try
      |
    7 | //! 5. For both the `syn::Expr` and rustc_ast::Expr, crawl the syntax tree to
      |                     ~~~~~~~~~~~

    warning: item in documentation is missing backticks
     --> tests/test_precedence.rs:7:35
      |
    7 | //! 5. For both the syn::Expr and rustc_ast::Expr, crawl the syntax tree to
      |                                   ^^^^^^^^^^^^^^^
      |
      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#doc_markdown
    help: try
      |
    7 | //! 5. For both the syn::Expr and `rustc_ast::Expr`, crawl the syntax tree to
      |                                   ~~~~~~~~~~~~~~~~~

    warning: item in documentation is missing backticks
     --> tests/test_precedence.rs:9:42
      |
    9 | //! 6. Serialize the fully parenthesized syn::Expr to a string of source code.
      |                                          ^^^^^^^^^
      |
      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#doc_markdown
    help: try
      |
    9 | //! 6. Serialize the fully parenthesized `syn::Expr` to a string of source code.
      |                                          ~~~~~~~~~~~

    warning: item in documentation is missing backticks
      --> tests/test_precedence.rs:10:56
       |
    10 | //! 7. Parse the fully parenthesized source code using librustc_parse.
       |                                                        ^^^^^^^^^^^^^^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#doc_markdown
    help: try
       |
    10 | //! 7. Parse the fully parenthesized source code using `librustc_parse`.
       |                                                        ~~~~~~~~~~~~~~~~

    warning: item in documentation is missing backticks
      --> tests/test_precedence.rs:11:20
       |
    11 | //! 8. Compare the rustc_ast::Expr resulting from parenthesizing using rustc
       |                    ^^^^^^^^^^^^^^^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#doc_markdown
    help: try
       |
    11 | //! 8. Compare the `rustc_ast::Expr` resulting from parenthesizing using rustc
       |                    ~~~~~~~~~~~~~~~~~

This reverts commit 7aef1ed.

Implement Copy and ToTokens for Nothing