docs.rs build fails for datafusion-proto 37.0.0

[alamb]

Describe the bug

Apparently the build failed for https://docs.rs/crate/datafusion-proto/latest

The build has a log
https://docs.rs/crate/datafusion-proto/37.0.0/builds/1179419

https://docs.rs/crate/datafusion-proto/37.0.0/builds/1179419/x86_64-unknown-linux-gnu.txt

# rustc version
rustc 1.79.0-nightly (385fa9d84 2024-04-04)
# docs.rs version
docsrs 0.6.0 (42f2c842 2024-04-05)

# build log
[INFO] running `Command { std: "docker" "create" "-v" "/home/cratesfyi/workspace/builds/datafusion-proto-37.0.0/target:/opt/rustwide/target:rw,Z" "-v" "/home/cratesfyi/workspace/builds/datafusion-proto-37.0.0/source:/opt/rustwide/workdir:ro,Z" "-v" "/home/cratesfyi/workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/home/cratesfyi/workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "DOCS_RS=1" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "6442450944" "--cpus" "6" "--user" "1001:1001" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "rustdoc" "--lib" "-Zrustdoc-map" "--config" "build.rustdocflags=[\"--cfg\", \"docsrs\", \"-Z\", \"unstable-options\", \"--emit=invocation-specific\", \"--resource-suffix\", \"-20240404-1.79.0-nightly-385fa9d84\", \"--static-root-path\", \"/-/rustdoc.static/\", \"--cap-lints\", \"warn\", \"--extern-html-root-takes-precedence\"]" "--offline" "-Zunstable-options" "--config=doc.extern-map.registries.crates-io=\"https://docs.rs/{pkg_name}/{version}/x86_64-unknown-linux-gnu\"" "-Zrustdoc-scrape-examples" "-j6" "--target" "x86_64-unknown-linux-gnu", kill_on_drop: false }`
[INFO] [stdout] afc2ab1a717fcddc18e7dcb057f4d3be9d2b033a86d67ca3c1a799101a944db3
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "afc2ab1a717fcddc18e7dcb057f4d3be9d2b033a86d67ca3c1a799101a944db3", kill_on_drop: false }`
[INFO] [stderr] warning: target filter specified, but no targets matched; this is a no-op
[INFO] [stderr]  Documenting datafusion-proto v37.0.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0432]: unresolved import `generated::datafusion`
[INFO] [stderr]    --> src/lib.rs:120:9
[INFO] [stderr]     |
[INFO] [stderr] 120 | pub use generated::datafusion as protobuf;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ no `datafusion` in `generated`
[INFO] [stderr]     |
[INFO] [stderr] note: found an item that was configured out
[INFO] [stderr]    --> src/generated/mod.rs:21:9
[INFO] [stderr]     |
[INFO] [stderr] 21  | pub mod datafusion {
[INFO] [stderr]     |         ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0432`.
[INFO] [stderr] error: could not document `datafusion-proto`
[INFO] running `Command { std: "docker" "inspect" "afc2ab1a717fcddc18e7dcb057f4d3be9d2b033a86d67ca3c1a799101a944db3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "afc2ab1a717fcddc18e7dcb057f4d3be9d2b033a86d67ca3c1a799101a944db3", kill_on_drop: false }`
[INFO] [stdout] afc2ab1a717fcddc18e7dcb057f4d3be9d2b033a86d67ca3c1a799101a944db3

To Reproduce

No response

Expected behavior

No response

Additional context

No response

[alamb]

Looks like the problem actually exists on 36.0.0 as well: https://docs.rs/crate/datafusion-proto/36.0.0/builds/1133246

It seems like the issue is that this module is not enabled in docsrs:

https://github.com/apache/datafusion/blame/main/datafusion/proto/src/generated/mod.rs#L20

Which looks like it came in #3580 (but was before we vendored (aka checked in the code)). I think the solution is to just comment out that define

[alamb]

FWIW it seems to be working on 38.0.0: https://docs.rs/datafusion-proto/latest/datafusion_proto/