[INFO] cloning repository https://github.com/noneuclideangirl/cryptid
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/noneuclideangirl/cryptid" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnoneuclideangirl%2Fcryptid", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnoneuclideangirl%2Fcryptid'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 288ef0c9358ed420238b0cc0514f3c423d26830e
[INFO] documenting noneuclideangirl/cryptid 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%2Fnoneuclideangirl%2Fcryptid" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/noneuclideangirl/cryptid 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/noneuclideangirl/cryptid
[INFO] finished tweaking git repo https://github.com/noneuclideangirl/cryptid
[INFO] tweaked toml for git repo https://github.com/noneuclideangirl/cryptid written to /workspace/builds/worker-2/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] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d98d5376497f920877bb8375849be3cacdf3e08855d9f2f9e4d4fe7eb278fd06
[INFO] running `Command { std: "docker" "start" "-a" "d98d5376497f920877bb8375849be3cacdf3e08855d9f2f9e4d4fe7eb278fd06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d98d5376497f920877bb8375849be3cacdf3e08855d9f2f9e4d4fe7eb278fd06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d98d5376497f920877bb8375849be3cacdf3e08855d9f2f9e4d4fe7eb278fd06", kill_on_drop: false }`
[INFO] [stdout] d98d5376497f920877bb8375849be3cacdf3e08855d9f2f9e4d4fe7eb278fd06
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] a2ce705bd7d79c461f64c0d9ccff273ab9763273c3106a76a7c09dc3e6052f4d
[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" "a2ce705bd7d79c461f64c0d9ccff273ab9763273c3106a76a7c09dc3e6052f4d", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling packed_simd v0.3.3
[INFO] [stderr]     Checking spin v0.5.2
[INFO] [stderr]     Checking subtle v2.2.3
[INFO] [stderr]     Checking untrusted v0.7.1
[INFO] [stderr]     Checking zeroize v1.1.0
[INFO] [stderr]     Checking base64 v0.12.3
[INFO] [stderr]    Compiling num-bigint v0.3.0
[INFO] [stderr]    Compiling ring v0.16.15
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]    Compiling serde_derive v1.0.115
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/subtle-2.2.3/src/lib.rs:12:34
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![cfg_attr(feature = "nightly", feature(external_doc))]
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `subtle`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "a2ce705bd7d79c461f64c0d9ccff273ab9763273c3106a76a7c09dc3e6052f4d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a2ce705bd7d79c461f64c0d9ccff273ab9763273c3106a76a7c09dc3e6052f4d", kill_on_drop: false }`
[INFO] [stdout] a2ce705bd7d79c461f64c0d9ccff273ab9763273c3106a76a7c09dc3e6052f4d