New project: rspc = {version = "1.0.0-rc.5"} specta = {version = "2.0.0-rc.1"} will automatically install "specta-macros"@2.0.0-rc.6, which results in a breaking change

[greatcat19]

The lock file would be like

[[package]]
name = "specta-macros"
version = "2.0.0-rc.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "14363e2a9ff7d07fdf6a138a8637ba980da8144b181536ed0f3b445a5f02f949"
dependencies = [
 "Inflector",
 "proc-macro2",
 "quote",
 "syn 1.0.109",
]

instead of

[[package]]
name = "specta-macros"
version = "2.0.0-rc.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "dd0de71d47f9076754480433ca4fdcbde756312b56e7991ac17f2cb2435897ed"
dependencies = [
 "Inflector",
 "itertools",
 "proc-macro2",
 "quote",
 "syn 1.0.109",
 "termcolor",
]

Thus, there will be a compilation error:

error: specta: expected path. Eg. `String` or `std::string::String`
   --> /Users/$USER/.cargo/registry/src/index.crates.io-6f17d22bba15001f/specta-2.0.0-rc.1/src/type/impls.rs:193:19
    |
193 | #[specta(remote = "SystemTime", crate = "crate", export = false)]
    |                   ^^^^^^^^^^^^

error: specta: expected path. Eg. `String` or `std::string::String`
   --> /Users/$USER/.cargo/registry/src/index.crates.io-6f17d22bba15001f/specta-2.0.0-rc.1/src/type/impls.rs:201:19
    |
201 | #[specta(remote = "Duration", crate = "crate", export = false)]
    |                   ^^^^^^^^^^

error[E0432]: unresolved import `specta_macros::RSPCType`
   --> /Users/$USER/.cargo/registry/src/index.crates.io-6f17d22bba15001f/specta-2.0.0-rc.1/src/lib.rs:112:9
    |
112 | pub use specta_macros::RSPCType;
    |         ^^^^^^^^^^^^^^^^^^^^^^^ no `RSPCType` in the root

   Compiling hyper v0.14.27
   Compiling dirs v5.0.1

We might need rc6 for rspc?

[oscartbeaumont]

Whoops, my bad. Transfering this to the Specta repo as it's not an rspc bug.

I did not correctly fix the version of specta-macros in the specta package. Will ensure that is fixed for future releases. You should be able to add specta-macros = { version = "=2.0.0-rc.1" } to your Cargo.toml as a workaround.

[greatcat19]

@oscartbeaumont thank you!