[INFO] fetching crate gmt_dos-clients_fem 4.3.4...
[INFO] documenting gmt_dos-clients_fem-4.3.4 against 1.81.0 for beta-1.82-rustdoc-1
[INFO] extracting crate gmt_dos-clients_fem 4.3.4 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate gmt_dos-clients_fem 4.3.4 on toolchain 1.81.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.81.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate gmt_dos-clients_fem 4.3.4
[INFO] finished tweaking crates.io crate gmt_dos-clients_fem 4.3.4
[INFO] tweaked toml for crates.io crate gmt_dos-clients_fem 4.3.4 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate crates.io crate gmt_dos-clients_fem 4.3.4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.81.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:96c0aa5895ecf336b730ef27bcdde6e21027415df19888aad3cf1448e5d65d90" "/opt/rustwide/cargo-home/bin/cargo" "+1.81.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
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[INFO] [stderr] warning: gmt_dos-clients_fem@4.3.4: the FEM_REPO environment variable is not set, using dummy inputs and outputs instead
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[INFO] [stderr]  Documenting gmt_dos-clients_fem v4.3.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unexpected `cfg` condition name: `fem`
[INFO] [stdout]    --> src/discrete_state_space.rs:316:11
[INFO] [stdout]     |
[INFO] [stdout] 316 |     #[cfg(fem)]
[INFO] [stdout]     |           ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: expected names are: `clippy`, `debug_assertions`, `doc`, `docsrs`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `rustfmt`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `ub_checks`, `unix`, and `windows`
[INFO] [stdout]     = help: consider using a Cargo feature instead
[INFO] [stdout]     = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]              [lints.rust]
[INFO] [stdout]              unexpected_cfgs = { level = "warn", check-cfg = ['cfg(fem)'] }
[INFO] [stdout]     = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(fem)");` to the top of the `build.rs`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]     = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition name: `fem`
[INFO] [stdout]    --> src/discrete_state_space.rs:571:11
[INFO] [stdout]     |
[INFO] [stdout] 571 |     #[cfg(fem)]
[INFO] [stdout]     |           ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider using a Cargo feature instead
[INFO] [stdout]     = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]              [lints.rust]
[INFO] [stdout]              unexpected_cfgs = { level = "warn", check-cfg = ['cfg(fem)'] }
[INFO] [stdout]     = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(fem)");` to the top of the `build.rs`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition name: `fem`
[INFO] [stdout]    --> src/discrete_state_space.rs:777:15
[INFO] [stdout]     |
[INFO] [stdout] 777 |     #[cfg(not(fem))]
[INFO] [stdout]     |               ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider using a Cargo feature instead
[INFO] [stdout]     = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]              [lints.rust]
[INFO] [stdout]              unexpected_cfgs = { level = "warn", check-cfg = ['cfg(fem)'] }
[INFO] [stdout]     = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(fem)");` to the top of the `build.rs`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition name: `fem`
[INFO] [stdout]   --> src/actors_interface.rs:23:7
[INFO] [stdout]    |
[INFO] [stdout] 23 | #[cfg(fem)]
[INFO] [stdout]    |       ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a Cargo feature instead
[INFO] [stdout]    = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]             [lints.rust]
[INFO] [stdout]             unexpected_cfgs = { level = "warn", check-cfg = ['cfg(fem)'] }
[INFO] [stdout]    = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(fem)");` to the top of the `build.rs`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition name: `fem`
[INFO] [stdout]   --> src/actors_interface.rs:25:7
[INFO] [stdout]    |
[INFO] [stdout] 25 | #[cfg(fem)]
[INFO] [stdout]    |       ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a Cargo feature instead
[INFO] [stdout]    = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]             [lints.rust]
[INFO] [stdout]             unexpected_cfgs = { level = "warn", check-cfg = ['cfg(fem)'] }
[INFO] [stdout]    = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(fem)");` to the top of the `build.rs`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition name: `fem`
[INFO] [stdout]   --> src/actors_interface.rs:27:7
[INFO] [stdout]    |
[INFO] [stdout] 27 | #[cfg(fem)]
[INFO] [stdout]    |       ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a Cargo feature instead
[INFO] [stdout]    = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]             [lints.rust]
[INFO] [stdout]             unexpected_cfgs = { level = "warn", check-cfg = ['cfg(fem)'] }
[INFO] [stdout]    = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(fem)");` to the top of the `build.rs`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition name: `fem`
[INFO] [stdout]   --> src/actors_interface.rs:29:7
[INFO] [stdout]    |
[INFO] [stdout] 29 | #[cfg(fem)]
[INFO] [stdout]    |       ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a Cargo feature instead
[INFO] [stdout]    = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]             [lints.rust]
[INFO] [stdout]             unexpected_cfgs = { level = "warn", check-cfg = ['cfg(fem)'] }
[INFO] [stdout]    = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(fem)");` to the top of the `build.rs`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1m 14s
[INFO] [stderr]    Generated /opt/rustwide/target/doc/gmt_dos_clients_fem/index.html
[INFO] running `Command { std: "docker" "inspect" "dd6c1cd061cc714c1fed12ec659f4dc62f865313e500cb5bc2efc73a0714b363", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dd6c1cd061cc714c1fed12ec659f4dc62f865313e500cb5bc2efc73a0714b363", kill_on_drop: false }`
[INFO] [stdout] dd6c1cd061cc714c1fed12ec659f4dc62f865313e500cb5bc2efc73a0714b363
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "DOCS_RS=1" "-e" "RUSTC_BOOTSTRAP=1" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:96c0aa5895ecf336b730ef27bcdde6e21027415df19888aad3cf1448e5d65d90" "/opt/rustwide/cargo-home/bin/cargo" "+1.81.0" "rustdoc" "--lib" "-Zrustdoc-map" "--all-features" "--config" "build.rustdocflags=[\"--cfg\", \"docsrs\", \"-Z\", \"unstable-options\", \"--document-private-items\"]" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e0cff1ea546f59beb49270c99cda02f5835b3ec035cdb187de4416b78bfba4ff
[INFO] running `Command { std: "docker" "start" "-a" "e0cff1ea546f59beb49270c99cda02f5835b3ec035cdb187de4416b78bfba4ff", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.81
[INFO] [stderr]    Compiling serde v1.0.199
[INFO] [stderr]    Compiling thiserror v1.0.59
[INFO] [stderr]    Compiling anyhow v1.0.82
[INFO] [stderr]     Checking utf8parse v0.2.1
[INFO] [stderr]     Checking colorchoice v1.0.0
[INFO] [stderr]     Checking anstyle v1.0.6
[INFO] [stderr]     Checking anstyle-parse v0.2.3
[INFO] [stderr]     Checking anstyle-query v1.0.2
[INFO] [stderr]     Checking clap_lex v0.7.0
[INFO] [stderr]     Checking strsim v0.11.1
[INFO] [stderr]    Compiling heck v0.5.0
[INFO] [stderr]     Checking anstream v0.6.13
[INFO] [stderr]     Checking clap_builder v4.5.2
[INFO] [stderr]    Compiling quote v1.0.36
[INFO] [stderr]    Compiling syn v2.0.60
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling csv v1.3.0
[INFO] [stderr]    Compiling serde_json v1.0.116
[INFO] [stderr]    Compiling arrow-csv v30.0.1
[INFO] [stderr]    Compiling nalgebra-macros v0.2.1
[INFO] [stderr]    Compiling matio-rs_derive v0.1.0
[INFO] [stderr]    Compiling arrow-json v30.0.1
[INFO] [stderr]    Compiling prettyplease v0.2.19
[INFO] [stderr]    Compiling bindgen v0.69.4
[INFO] [stderr]    Compiling serde_derive v1.0.199
[INFO] [stderr]    Compiling thiserror-impl v1.0.59
[INFO] [stderr]    Compiling futures-macro v0.3.30
[INFO] [stderr]    Compiling tracing-attributes v0.1.27
[INFO] [stderr]    Compiling dos-uid-derive v5.0.0
[INFO] [stderr]    Compiling tokio-macros v2.2.0
[INFO] [stderr]    Compiling async-trait v0.1.80
[INFO] [stderr]    Compiling clap_derive v4.5.4
[INFO] [stderr]     Checking tokio v1.37.0
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]    Compiling flatbuffers v22.9.29
[INFO] [stderr]    Compiling tracing v0.1.40
[INFO] [stderr]    Compiling arrow-ipc v30.0.1
[INFO] [stderr]    Compiling gmt_dos-actors_dsl v2.1.1
[INFO] [stderr]     Checking geotrans v0.2.2
[INFO] [stderr]    Compiling parquet v30.0.1
[INFO] [stderr]    Compiling arrow v30.0.1
[INFO] [stderr]     Checking clap v4.5.4
[INFO] [stderr]     Checking futures-executor v0.3.30
[INFO] [stderr]     Checking futures v0.3.30
[INFO] [stderr]    Compiling matio-rs-sys v0.2.3
[INFO] [stderr]     Checking num-complex v0.4.5
[INFO] [stderr]     Checking bincode v2.0.0-rc.3
[INFO] [stderr]     Checking serde-pickle v0.6.3
[INFO] [stderr]     Checking serde-pickle v1.1.1
[INFO] [stderr]     Checking num v0.4.2
[INFO] [stderr]     Checking simba v0.8.1
[INFO] [stderr]     Checking arrow-buffer v30.0.1
[INFO] [stderr]     Checking arrow-data v30.0.1
[INFO] [stderr]     Checking gmt_dos-actors-clients_interface v1.3.1
[INFO] [stderr]     Checking gmt_dos-actors v11.0.0
[INFO] [stderr]     Checking gmt_dos-clients v4.3.0
[INFO] [stderr]     Checking arrow-array v30.0.1
[INFO] [stderr]    Compiling gmt-fem-code-builder v2.1.0
[INFO] [stderr]     Checking arrow-select v30.0.1
[INFO] [stderr]     Checking arrow-arith v30.0.1
[INFO] [stderr]     Checking arrow-row v30.0.1
[INFO] [stderr]     Checking arrow-cast v30.0.1
[INFO] [stderr]     Checking arrow-string v30.0.1
[INFO] [stderr]     Checking arrow-ord v30.0.1
[INFO] [stderr]     Checking nalgebra v0.32.5
[INFO] [stderr]    Compiling gmt_dos-clients_io v4.2.0
[INFO] [stderr]    Compiling gmt-fem v5.1.0
[INFO] [stderr]    Compiling gmt_dos-clients_fem v4.3.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking matio-rs v1.3.2
[INFO] [stderr] warning: gmt_dos-clients_fem@4.3.4: the FEM_REPO environment variable is not set, using dummy inputs and outputs instead
[INFO] [stderr]  Documenting gmt_dos-clients_fem v4.3.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unexpected `cfg` condition name: `fem`
[INFO] [stdout]    --> src/discrete_state_space.rs:316:11
[INFO] [stdout]     |
[INFO] [stdout] 316 |     #[cfg(fem)]
[INFO] [stdout]     |           ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: expected names are: `clippy`, `debug_assertions`, `doc`, `docsrs`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `rustfmt`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `ub_checks`, `unix`, and `windows`
[INFO] [stdout]     = help: consider using a Cargo feature instead
[INFO] [stdout]     = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]              [lints.rust]
[INFO] [stdout]              unexpected_cfgs = { level = "warn", check-cfg = ['cfg(fem)'] }
[INFO] [stdout]     = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(fem)");` to the top of the `build.rs`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]     = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition name: `fem`
[INFO] [stdout]    --> src/discrete_state_space.rs:571:11
[INFO] [stdout]     |
[INFO] [stdout] 571 |     #[cfg(fem)]
[INFO] [stdout]     |           ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider using a Cargo feature instead
[INFO] [stdout]     = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]              [lints.rust]
[INFO] [stdout]              unexpected_cfgs = { level = "warn", check-cfg = ['cfg(fem)'] }
[INFO] [stdout]     = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(fem)");` to the top of the `build.rs`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition name: `fem`
[INFO] [stdout]    --> src/discrete_state_space.rs:777:15
[INFO] [stdout]     |
[INFO] [stdout] 777 |     #[cfg(not(fem))]
[INFO] [stdout]     |               ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider using a Cargo feature instead
[INFO] [stdout]     = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]              [lints.rust]
[INFO] [stdout]              unexpected_cfgs = { level = "warn", check-cfg = ['cfg(fem)'] }
[INFO] [stdout]     = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(fem)");` to the top of the `build.rs`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition name: `fem`
[INFO] [stdout]   --> src/actors_interface.rs:23:7
[INFO] [stdout]    |
[INFO] [stdout] 23 | #[cfg(fem)]
[INFO] [stdout]    |       ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a Cargo feature instead
[INFO] [stdout]    = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]             [lints.rust]
[INFO] [stdout]             unexpected_cfgs = { level = "warn", check-cfg = ['cfg(fem)'] }
[INFO] [stdout]    = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(fem)");` to the top of the `build.rs`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition name: `fem`
[INFO] [stdout]   --> src/actors_interface.rs:25:7
[INFO] [stdout]    |
[INFO] [stdout] 25 | #[cfg(fem)]
[INFO] [stdout]    |       ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a Cargo feature instead
[INFO] [stdout]    = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]             [lints.rust]
[INFO] [stdout]             unexpected_cfgs = { level = "warn", check-cfg = ['cfg(fem)'] }
[INFO] [stdout]    = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(fem)");` to the top of the `build.rs`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition name: `fem`
[INFO] [stdout]   --> src/actors_interface.rs:27:7
[INFO] [stdout]    |
[INFO] [stdout] 27 | #[cfg(fem)]
[INFO] [stdout]    |       ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a Cargo feature instead
[INFO] [stdout]    = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]             [lints.rust]
[INFO] [stdout]             unexpected_cfgs = { level = "warn", check-cfg = ['cfg(fem)'] }
[INFO] [stdout]    = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(fem)");` to the top of the `build.rs`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition name: `fem`
[INFO] [stdout]   --> src/actors_interface.rs:29:7
[INFO] [stdout]    |
[INFO] [stdout] 29 | #[cfg(fem)]
[INFO] [stdout]    |       ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a Cargo feature instead
[INFO] [stdout]    = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]             [lints.rust]
[INFO] [stdout]             unexpected_cfgs = { level = "warn", check-cfg = ['cfg(fem)'] }
[INFO] [stdout]    = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(fem)");` to the top of the `build.rs`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 45.25s
[INFO] [stderr]    Generated /opt/rustwide/target/doc/gmt_dos_clients_fem/index.html
[INFO] running `Command { std: "docker" "inspect" "e0cff1ea546f59beb49270c99cda02f5835b3ec035cdb187de4416b78bfba4ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e0cff1ea546f59beb49270c99cda02f5835b3ec035cdb187de4416b78bfba4ff", kill_on_drop: false }`
[INFO] [stdout] e0cff1ea546f59beb49270c99cda02f5835b3ec035cdb187de4416b78bfba4ff