[INFO] cloning repository https://github.com/jacklund/matrix-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jacklund/matrix-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjacklund%2Fmatrix-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjacklund%2Fmatrix-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 86f601e3d56b33d42cb65c12a4e415f893b833cd
[INFO] documenting jacklund/matrix-rs 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%2Fjacklund%2Fmatrix-rs" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jacklund/matrix-rs 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/jacklund/matrix-rs
[INFO] finished tweaking git repo https://github.com/jacklund/matrix-rs
[INFO] tweaked toml for git repo https://github.com/jacklund/matrix-rs written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/jacklund/matrix-rs already has a lockfile, it will not be regenerated
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] d9c95d85c25cbe30534841eb407f6935669b9fc74237c1c99c7f25be9d780fc3
[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" "d9c95d85c25cbe30534841eb407f6935669b9fc74237c1c99c7f25be9d780fc3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d9c95d85c25cbe30534841eb407f6935669b9fc74237c1c99c7f25be9d780fc3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d9c95d85c25cbe30534841eb407f6935669b9fc74237c1c99c7f25be9d780fc3", kill_on_drop: false }`
[INFO] [stdout] d9c95d85c25cbe30534841eb407f6935669b9fc74237c1c99c7f25be9d780fc3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] 59dc9c3824238426384d078a1fc2ab49f9a55f2f73be6c10ac1c56c7afe3e00a
[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" "59dc9c3824238426384d078a1fc2ab49f9a55f2f73be6c10ac1c56c7afe3e00a", kill_on_drop: false }`
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]    Compiling semver v0.1.20
[INFO] [stderr]     Checking libc v0.2.18
[INFO] [stderr]     Checking winapi v0.2.8
[INFO] [stderr]     Checking matches v0.1.4
[INFO] [stderr]     Checking log v0.3.6
[INFO] [stderr]    Compiling unicode-normalization v0.1.3
[INFO] [stderr]     Checking serde v0.8.21
[INFO] [stderr]    Compiling quote v0.3.10
[INFO] [stderr]    Compiling unicode-xid v0.0.3
[INFO] [stderr]    Compiling rustc-serialize v0.3.22
[INFO] [stderr]    Compiling ansi_term v0.9.0
[INFO] [stderr]     Checking httparse v1.2.1
[INFO] [stderr]    Compiling language-tags v0.2.2
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]    Compiling traitobject v0.0.1
[INFO] [stderr]    Compiling typeable v0.1.2
[INFO] [stderr]     Checking itoa v0.1.1
[INFO] [stderr]     Checking dtoa v0.2.2
[INFO] [stderr]     Checking num-traits v0.1.36
[INFO] [stderr]     Checking utf8-ranges v1.0.0
[INFO] [stderr]     Checking regex-syntax v0.4.0
[INFO] [stderr]     Checking lazy_static v0.1.16
[INFO] [stderr]     Checking unicode-bidi v0.2.4
[INFO] [stderr]     Checking hpack v0.2.0
[INFO] [stderr]     Checking mime v0.2.2
[INFO] [stderr]    Compiling kernel32-sys v0.2.2
[INFO] [stderr]    Compiling num_cpus v1.2.0
[INFO] [stderr]    Compiling syn v0.10.5
[INFO] [stderr]     Checking unreachable v0.1.1
[INFO] [stderr]    Compiling rustc_version v0.1.7
[INFO] [stderr]     Checking thread-id v3.0.0
[INFO] [stderr]     Checking memchr v1.0.1
[INFO] [stderr]    Compiling rocket_codegen v0.1.4
[INFO] [stderr]     Checking idna v0.1.0
[INFO] [stderr]     Checking solicit v0.4.4
[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/rocket_codegen-0.1.4/build.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_patterns)]
[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 `rocket_codegen`.
[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" "59dc9c3824238426384d078a1fc2ab49f9a55f2f73be6c10ac1c56c7afe3e00a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "59dc9c3824238426384d078a1fc2ab49f9a55f2f73be6c10ac1c56c7afe3e00a", kill_on_drop: false }`
[INFO] [stdout] 59dc9c3824238426384d078a1fc2ab49f9a55f2f73be6c10ac1c56c7afe3e00a