[INFO] cloning repository https://github.com/sirxyzzy/mini-basic
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sirxyzzy/mini-basic" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsirxyzzy%2Fmini-basic", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsirxyzzy%2Fmini-basic'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] aa93f1ae0863f7527e8130ae80187d2eaa812882
[INFO] documenting sirxyzzy/mini-basic 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%2Fsirxyzzy%2Fmini-basic" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sirxyzzy/mini-basic 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/sirxyzzy/mini-basic
[INFO] finished tweaking git repo https://github.com/sirxyzzy/mini-basic
[INFO] tweaked toml for git repo https://github.com/sirxyzzy/mini-basic written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/sirxyzzy/mini-basic 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]  Downloading crates ...
[INFO] [stderr]   Downloaded float-cmp v0.8.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] c9861011e88e008af6e20194945961d5970e86813c518f0aa596beff8f928861
[INFO] running `Command { std: "docker" "start" "-a" "c9861011e88e008af6e20194945961d5970e86813c518f0aa596beff8f928861", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c9861011e88e008af6e20194945961d5970e86813c518f0aa596beff8f928861", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c9861011e88e008af6e20194945961d5970e86813c518f0aa596beff8f928861", kill_on_drop: false }`
[INFO] [stdout] c9861011e88e008af6e20194945961d5970e86813c518f0aa596beff8f928861
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] ad10d1fa602fbfb7694e285b304a8df9eb2b8250a8f8c53f28ce494bf89d84bd
[INFO] running `Command { std: "docker" "start" "-a" "ad10d1fa602fbfb7694e285b304a8df9eb2b8250a8f8c53f28ce494bf89d84bd", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.30
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]    Compiling maplit v1.0.2
[INFO] [stderr]    Compiling anyhow v1.0.31
[INFO] [stderr]     Checking os_str_bytes v2.3.1
[INFO] [stderr]    Compiling proc-macro-error-attr v0.4.12
[INFO] [stderr]    Compiling proc-macro-error v0.4.12
[INFO] [stderr]    Compiling proc-macro2 v1.0.18
[INFO] [stderr]     Checking float-cmp v0.8.0
[INFO] [stderr]     Checking indexmap v1.4.0
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking pest v2.1.3
[INFO] [stderr]    Compiling quote v1.0.6
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]    Compiling pest_meta v2.1.3
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling thiserror-impl v1.0.19
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]    Compiling clap_derive v3.0.0-beta.1
[INFO] [stderr]     Checking thiserror v1.0.19
[INFO] [stderr]     Checking clap v3.0.0-beta.1
[INFO] [stderr]     Checking mini-basic v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting mini-basic v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(box_syntax, box_patterns)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(box_syntax, box_patterns)]
[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 `mini-basic`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name mini_basic 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 anyhow=/opt/rustwide/target/debug/deps/libanyhow-70b362b0d3f6c020.rmeta --extern clap=/opt/rustwide/target/debug/deps/libclap-a02bc3fc995825f8.rmeta --extern env_logger=/opt/rustwide/target/debug/deps/libenv_logger-b08464200fcb026d.rmeta --extern float_cmp=/opt/rustwide/target/debug/deps/libfloat_cmp-59c73d2e01e01fe0.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-9b4c3c8ba22d4f89.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-db88f49d9e5662e7.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-69d9a7f018cb28c7.rmeta --extern pest=/opt/rustwide/target/debug/deps/libpest-2de5595cb6b09a5a.rmeta --extern pest_derive=/opt/rustwide/target/debug/deps/libpest_derive-b425bb52e282ef85.so --extern rand=/opt/rustwide/target/debug/deps/librand-5f090499bcacf7c9.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-2b0bd3e10b985586.rmeta --extern thiserror=/opt/rustwide/target/debug/deps/libthiserror-0ade06eccd0534aa.rmeta --extern walkdir=/opt/rustwide/target/debug/deps/libwalkdir-37c1eba6428ea4cb.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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: build failed
[INFO] running `Command { std: "docker" "inspect" "ad10d1fa602fbfb7694e285b304a8df9eb2b8250a8f8c53f28ce494bf89d84bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ad10d1fa602fbfb7694e285b304a8df9eb2b8250a8f8c53f28ce494bf89d84bd", kill_on_drop: false }`
[INFO] [stdout] ad10d1fa602fbfb7694e285b304a8df9eb2b8250a8f8c53f28ce494bf89d84bd