upgrade dependency proc-macro2

[jtmoon79]

tl;dr upgrading proc-macro2 version would avoid a known proc-macro2 bug error[E0635]: unknown feature proc_macro_span_shrink

My project is using test_case v3.1.0 which depends on proc-macro2 v1.0.52.

$ cargo tree
...
└── test-case v3.1.0
    └── test-case-macros v3.1.0 (proc-macro)
        ├── proc-macro-error v1.0.4
        │   ├── proc-macro-error-attr v1.0.4 (proc-macro)
        │   │   ├── proc-macro2 v1.0.52 (*)
        │   │   └── quote v1.0.26 (*)
        │   │   [build-dependencies]
        │   │   └── version_check v0.9.4
        │   ├── proc-macro2 v1.0.52 (*)
        │   ├── quote v1.0.26 (*)
        │   └── syn v1.0.109 (*)
        │   [build-dependencies]
        │   └── version_check v0.9.4
        ├── proc-macro2 v1.0.52 (*)
        ├── quote v1.0.26 (*)
        ├── syn v1.0.109 (*)
        └── test-case-core v3.1.0
            ├── cfg-if v1.0.0
            ├── proc-macro-error v1.0.4 (*)
            ├── proc-macro2 v1.0.52 (*)
            ├── quote v1.0.26 (*)
            └── syn v1.0.109 (*)

proc-macro2 Issue dtolnay/proc-macro2#356 causes failures of some tools like udeps with error

$ cargo +nightly udeps
error[E0635]: unknown feature `proc_macro_span_shrink`
  --> /home/ulug/.cargo/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.52/src/lib.rs:92:30
   |
92 |     feature(proc_macro_span, proc_macro_span_shrink)
   |                              ^^^^^^^^^^^^^^^^^^^^^^

According to the linked proc-macro2 Issue

you need to upgrade proc-macro2 to 1.0.60+, downgrade proc-macro2 to 1.0.43 or before, downgrade the nightly toolchain to nightly-2023-06-28 or before, or use a non-nightly toolchain.

This error occurred on rust 1.70.0 and 1.72.0.

Can test-case upgrade it's proc-macro2 dependency version?

[luke-biel]

Sorry for getting back to you so late. This is not a test-case issue, as we don't provide Cargo.lock with our crate (and I think these are not used when compiling dependency libraries anyway). You should update your project, our lock version 1.0 is compatible with everything that dtolnay released so far.

Try:
cargo update -p proc-macro2