[INFO] cloning repository https://github.com/crumblingstatue/cmakr
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/crumblingstatue/cmakr" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcrumblingstatue%2Fcmakr", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcrumblingstatue%2Fcmakr'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b95b52177241ae803e7bea18e41e8e6a691de2ac
[INFO] documenting crumblingstatue/cmakr against 1.47.0 for beta-1.48-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcrumblingstatue%2Fcmakr" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/crumblingstatue/cmakr on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/crumblingstatue/cmakr
[INFO] finished tweaking git repo https://github.com/crumblingstatue/cmakr
[INFO] tweaked toml for git repo https://github.com/crumblingstatue/cmakr written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/crumblingstatue/cmakr already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e98fe816296c46ab4c876e08591909855cbcfc191a8f49dc84b6f52a8947ca12
[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" "e98fe816296c46ab4c876e08591909855cbcfc191a8f49dc84b6f52a8947ca12", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e98fe816296c46ab4c876e08591909855cbcfc191a8f49dc84b6f52a8947ca12", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e98fe816296c46ab4c876e08591909855cbcfc191a8f49dc84b6f52a8947ca12", kill_on_drop: false }`
[INFO] [stdout] e98fe816296c46ab4c876e08591909855cbcfc191a8f49dc84b6f52a8947ca12
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+1.47.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fb19ab7f656fd87b66ea8fae11ecd98163bf9e372dd34396d9cd67217e6a6c16
[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" "fb19ab7f656fd87b66ea8fae11ecd98163bf9e372dd34396d9cd67217e6a6c16", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.20
[INFO] [stderr]     Checking unicode-width v0.1.5
[INFO] [stderr]    Compiling serde v1.0.80
[INFO] [stderr]     Checking getopts v0.2.18
[INFO] [stderr]    Compiling quote v0.6.9
[INFO] [stderr]    Compiling syn v0.15.15
[INFO] [stderr]    Compiling serde_derive v1.0.80
[INFO] [stderr]     Checking toml v0.4.8
[INFO] [stderr]  Documenting cmakr v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![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 `cmakr`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name cmakr src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern getopts=/opt/rustwide/target/debug/deps/libgetopts-9b2fd39351b60bbe.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-39725c527a66218d.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-5b46a80a6c93e39b.so --extern toml=/opt/rustwide/target/debug/deps/libtoml-db11cafac270fefe.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "fb19ab7f656fd87b66ea8fae11ecd98163bf9e372dd34396d9cd67217e6a6c16", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb19ab7f656fd87b66ea8fae11ecd98163bf9e372dd34396d9cd67217e6a6c16", kill_on_drop: false }`
[INFO] [stdout] fb19ab7f656fd87b66ea8fae11ecd98163bf9e372dd34396d9cd67217e6a6c16
