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# error kind ExecutionFailed
# pre-build errors command failed: exit status: 101
# rustc version rustc 1.97.0-nightly (fb0a5a5a9 2026-05-08)
# docs.rs version docsrs 0.0.0 (ad302d961e54d5d2c273ab5bb3d4139759c933ad 2026-05-03 )
# build log [INFO] running `Command { std: "docker" "create" "-v" "/home/cratesfyi/workspace/builds/echo_integration-0.1.4/target:/opt/rustwide/target:rw,Z" "-v" "/home/cratesfyi/workspace/builds/echo_integration-0.1.4/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" "-m" "6442450944" "--cpuset-cpus" "8-13" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "sleep" "infinity", kill_on_drop: false }` [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] 34ede04e6de208560b552b8b0a8d513fc19cff6c0365f4d09ee4c55c8cbfe4a1 [INFO] running `Command { std: "docker" "start" "34ede04e6de208560b552b8b0a8d513fc19cff6c0365f4d09ee4c55c8cbfe4a1", kill_on_drop: false }` [INFO] running `Command { std: "docker" "exec" "-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" "--user" "1001:1001" "34ede04e6de208560b552b8b0a8d513fc19cff6c0365f4d09ee4c55c8cbfe4a1" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "rustdoc" "--lib" "-Zrustdoc-map" "--all-features" "--config" "build.rustdocflags=[\"--cfg\", \"docsrs\", \"--cfg\", \"docsrs\", \"-Z\", \"unstable-options\", \"--emit=invocation-specific\", \"--resource-suffix\", \"-20260508-1.97.0-nightly-fb0a5a5a9\", \"--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] [stderr] warning: target filter specified, but no targets matched; this is a no-op [INFO] [stderr] Documenting echo_integration v0.1.4 (/opt/rustwide/workdir) [INFO] [stderr] error[E0658]: `#[doc(cfg)]` is experimental [INFO] [stderr] --> src/lib.rs:17:20 [INFO] [stderr] | [INFO] [stderr] 17 | #[cfg_attr(docsrs, doc(cfg(feature = "mcp")))] [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: see issue #43781 <https://github.com/rust-lang/rust/issues/43781> for more information [INFO] [stderr] = help: add `#![feature(doc_cfg)]` to the crate attributes to enable [INFO] [stderr] = note: this compiler was built on 2026-05-08; consider upgrading it if it is out of date [INFO] [stderr] [INFO] [stderr] error[E0658]: `#[doc(cfg)]` is experimental [INFO] [stderr] --> src/lib.rs:21:20 [INFO] [stderr] | [INFO] [stderr] 21 | #[cfg_attr(docsrs, doc(cfg(feature = "channels")))] [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: see issue #43781 <https://github.com/rust-lang/rust/issues/43781> for more information [INFO] [stderr] = help: add `#![feature(doc_cfg)]` to the crate attributes to enable [INFO] [stderr] = note: this compiler was built on 2026-05-08; consider upgrading it if it is out of date [INFO] [stderr] [INFO] [stderr] For more information about this error, try `rustc --explain E0658`. [INFO] [stderr] error: could not document `echo_integration` [INFO] running `Command { std: "docker" "stop" "-t" "1" "34ede04e6de208560b552b8b0a8d513fc19cff6c0365f4d09ee4c55c8cbfe4a1", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "34ede04e6de208560b552b8b0a8d513fc19cff6c0365f4d09ee4c55c8cbfe4a1", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "34ede04e6de208560b552b8b0a8d513fc19cff6c0365f4d09ee4c55c8cbfe4a1", kill_on_drop: false }` [INFO] [stdout] 34ede04e6de208560b552b8b0a8d513fc19cff6c0365f4d09ee4c55c8cbfe4a1