[INFO] cloning repository https://github.com/eonil/cargo-ipcgen-swift
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/eonil/cargo-ipcgen-swift" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Feonil%2Fcargo-ipcgen-swift", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Feonil%2Fcargo-ipcgen-swift'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b93d463b5a0260aec9db5335d93579e36300f188
[INFO] documenting eonil/cargo-ipcgen-swift against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Feonil%2Fcargo-ipcgen-swift" "/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/eonil/cargo-ipcgen-swift on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/eonil/cargo-ipcgen-swift
[INFO] finished tweaking git repo https://github.com/eonil/cargo-ipcgen-swift
[INFO] tweaked toml for git repo https://github.com/eonil/cargo-ipcgen-swift written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/eonil/cargo-ipcgen-swift already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded nibble_vec v0.0.4
[INFO] [stderr]   Downloaded endian-type v0.1.2
[INFO] [stderr]   Downloaded radix_trie v0.1.3
[INFO] [stderr]   Downloaded extprim v1.6.0
[INFO] [stderr]   Downloaded syntex_errors v0.59.1
[INFO] [stderr]   Downloaded serde v1.0.55
[INFO] [stderr]   Downloaded serde_derive v1.0.55
[INFO] [stderr]   Downloaded syntex_syntax v0.59.1
[INFO] [stderr]   Downloaded syn v0.13.10
[INFO] [stderr]   Downloaded syntex_pos v0.59.1
[INFO] [stderr]   Downloaded rls-span v0.4.0
[INFO] [stderr]   Downloaded derive-new v0.5.4
[INFO] [stderr]   Downloaded rls-analysis v0.13.0
[INFO] [stderr]   Downloaded rls-data v0.16.0
[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" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c26386952df6bdb8848897708cde2a7ba76b723e44b577259430e56bebc503af
[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" "c26386952df6bdb8848897708cde2a7ba76b723e44b577259430e56bebc503af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c26386952df6bdb8848897708cde2a7ba76b723e44b577259430e56bebc503af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c26386952df6bdb8848897708cde2a7ba76b723e44b577259430e56bebc503af", kill_on_drop: false }`
[INFO] [stdout] c26386952df6bdb8848897708cde2a7ba76b723e44b577259430e56bebc503af
[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" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", 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] db5395b17ddcff34c2fba00e2a6e6a0764b3851e04a51c6ac42dc4846b57e844
[INFO] running `Command { std: "docker" "start" "-a" "db5395b17ddcff34c2fba00e2a6e6a0764b3851e04a51c6ac42dc4846b57e844", kill_on_drop: false }`
[INFO] [stderr]     Checking endian-type v0.1.2
[INFO] [stderr]     Checking nibble_vec v0.0.4
[INFO] [stderr]     Checking rls-span v0.4.0
[INFO] [stderr]    Compiling rustc_version v0.2.2
[INFO] [stderr]    Compiling serde_derive v1.0.55
[INFO] [stderr]    Compiling derive-new v0.5.4
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rls-span-0.4.0/src/lib.rs:12:1
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![feature(proc_macro)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking radix_trie v0.1.3
[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 `rls-span`.
[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" "db5395b17ddcff34c2fba00e2a6e6a0764b3851e04a51c6ac42dc4846b57e844", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "db5395b17ddcff34c2fba00e2a6e6a0764b3851e04a51c6ac42dc4846b57e844", kill_on_drop: false }`
[INFO] [stdout] db5395b17ddcff34c2fba00e2a6e6a0764b3851e04a51c6ac42dc4846b57e844