use of undeclared crate or module proc_macro

[dblock]

Forgive me if this is a noob question, could someone please help me with idanarye/rust-typed-builder#57? I am not sure whether the issue is in proc_macro2 or in rust-typed-builder, or how to fix this.

Trying to use cargo-publish-all --dry-run in lycheeverse/lychee#304 seeing this:

rustc --edition=2018 --crate-name typed_builder /home/ubuntu/.cargo/registry/src/github.com-1ecc6299db9ec823/typed-builder-0.9.0/src/lib.rs --color always --crate-type proc-macro --emit=dep-info,link -C prefer-dynamic -C debuginfo=2 -C metadata=72ebad225c590f6d -C extra-filename=-72ebad225c590f6d --out-dir /home/ubuntu/source/lychee/dblock-lychee/target/package/lychee-lib-0.7.1/target/debug/deps -L dependency=/home/ubuntu/source/lychee/dblock-lychee/target/package/lychee-lib-0.7.1/target/debug/deps --extern proc_macro2=/home/ubuntu/source/lychee/dblock-lychee/target/package/lychee-lib-0.7.1/target/debug/deps/libproc_macro2-6f5ad8ea0bdf5b2f.rlib --extern quote=/home/ubuntu/source/lychee/dblock-lychee/target/package/lychee-lib-0.7.1/target/debug/deps/libquote-9b9b7563b6863207.rlib --extern syn=/home/ubuntu/source/lychee/dblock-lychee/target/package/lychee-lib-0.7.1/target/debug/deps/libsyn-c3d8aa50fc12e127.rlib --cap-lints allow

   Verifying lychee-lib
error[E0433]: failed to resolve: use of undeclared crate or module `proc_macro`
   --> /home/ubuntu/.cargo/registry/src/github.com-1ecc6299db9ec823/typed-builder-0.9.0/src/lib.rs:138:36
    |
138 | pub fn derive_typed_builder(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
    |                                    ^^^^^^^^^^ use of undeclared crate or module `proc_macro`

error[E0433]: failed to resolve: use of undeclared crate or module `proc_macro`
   --> /home/ubuntu/.cargo/registry/src/github.com-1ecc6299db9ec823/typed-builder-0.9.0/src/lib.rs:138:64
    |
138 | pub fn derive_typed_builder(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
    |                                                                ^^^^^^^^^^ use of undeclared crate or module `proc_macro`

Ideas?

[dblock]

Fixed via idanarye/rust-typed-builder#57