[INFO] cloning repository https://github.com/rustyhorde/libechoexec
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rustyhorde/libechoexec" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frustyhorde%2Flibechoexec", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frustyhorde%2Flibechoexec'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 315c423bd43ecf09e7e4933120d4fe027cebacd9
[INFO] documenting rustyhorde/libechoexec against 1.46.0 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frustyhorde%2Flibechoexec" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rustyhorde/libechoexec on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/rustyhorde/libechoexec
[INFO] finished tweaking git repo https://github.com/rustyhorde/libechoexec
[INFO] tweaked toml for git repo https://github.com/rustyhorde/libechoexec written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 94ca8c3d52bc8e1052e3c56a41818d488c0fd9acc5841ee91f7d345d4770267d
[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" "94ca8c3d52bc8e1052e3c56a41818d488c0fd9acc5841ee91f7d345d4770267d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "94ca8c3d52bc8e1052e3c56a41818d488c0fd9acc5841ee91f7d345d4770267d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "94ca8c3d52bc8e1052e3c56a41818d488c0fd9acc5841ee91f7d345d4770267d", kill_on_drop: false }`
[INFO] [stdout] 94ca8c3d52bc8e1052e3c56a41818d488c0fd9acc5841ee91f7d345d4770267d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "RUSTDOCFLAGS=--cap-lints=warn" "-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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6114cd31b78340401e9c78ec1c9e88f9ba94a161ff1fbde5d233f7542f177e5e
[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" "6114cd31b78340401e9c78ec1c9e88f9ba94a161ff1fbde5d233f7542f177e5e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]    Compiling pin-project-internal v0.4.23
[INFO] [stderr]     Checking once_cell v1.4.1
[INFO] [stderr]    Compiling proc-macro-hack v0.5.18
[INFO] [stderr]    Compiling openssl v0.10.30
[INFO] [stderr]    Compiling serde v1.0.115
[INFO] [stderr]    Compiling slog v2.5.2
[INFO] [stderr]     Checking try-lock v0.2.3
[INFO] [stderr]    Compiling indexmap v1.5.2
[INFO] [stderr]    Compiling openssl-sys v0.9.58
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking tracing-core v0.1.15
[INFO] [stderr]     Checking http v0.2.1
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking socket2 v0.3.12
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]     Checking futures-task v0.3.5
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking tracing v0.1.19
[INFO] [stderr]    Compiling native-tls v0.2.4
[INFO] [stderr]     Checking slog-try v0.2.0
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking http-body v0.3.1
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]    Compiling serde_derive v1.0.115
[INFO] [stderr]    Compiling getset v0.1.1
[INFO] [stderr]     Checking tokio v0.2.22
[INFO] [stderr]     Checking pin-project v0.4.23
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking tokio-util v0.3.1
[INFO] [stderr]     Checking tokio-tls v0.3.1
[INFO] [stderr]     Checking h2 v0.2.6
[INFO] [stderr]     Checking futures-executor v0.3.5
[INFO] [stderr]     Checking futures v0.3.5
[INFO] [stderr]     Checking serde_json v1.0.57
[INFO] [stderr]     Checking uuid v0.8.1
[INFO] [stderr]     Checking hyper v0.13.7
[INFO] [stderr]     Checking hyper-tls v0.4.3
[INFO] [stderr]  Documenting libechoexec v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:104:1
[INFO] [stdout]     |
[INFO] [stdout] 104 | #![feature(crate_visibility_modifier)]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `libechoexec`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name libechoexec src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern futures=/opt/rustwide/target/debug/deps/libfutures-10b21f2c6081df3f.rmeta --extern getset=/opt/rustwide/target/debug/deps/libgetset-d4ee4d064a520ed0.so --extern hyper=/opt/rustwide/target/debug/deps/libhyper-1cd8eb0d32ad5b1e.rmeta --extern hyper_tls=/opt/rustwide/target/debug/deps/libhyper_tls-625037f74bac3b3e.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-57a7edc7f441d44c.rmeta --extern native_tls=/opt/rustwide/target/debug/deps/libnative_tls-cf446ec430f6187b.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-8388f8be29a2bece.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-62ffbf8297f2d77c.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-f3db7e832128c3ab.rmeta --extern slog=/opt/rustwide/target/debug/deps/libslog-44fec4d0263d19bd.rmeta --extern slog_try=/opt/rustwide/target/debug/deps/libslog_try-1c6b52ac98f71917.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-1fa89ea13bea9d47.rmeta --extern uuid=/opt/rustwide/target/debug/deps/libuuid-95fdcfe6f9190ddf.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "6114cd31b78340401e9c78ec1c9e88f9ba94a161ff1fbde5d233f7542f177e5e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6114cd31b78340401e9c78ec1c9e88f9ba94a161ff1fbde5d233f7542f177e5e", kill_on_drop: false }`
[INFO] [stdout] 6114cd31b78340401e9c78ec1c9e88f9ba94a161ff1fbde5d233f7542f177e5e