[INFO] cloning repository https://github.com/echochamber/tinkering
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/echochamber/tinkering" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fechochamber%2Ftinkering", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fechochamber%2Ftinkering'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8e17f3360b516c74c1388059fa3c708a33ac4b6b
[INFO] documenting echochamber/tinkering against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fechochamber%2Ftinkering" "/workspace/builds/worker-39/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-39/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/echochamber/tinkering on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/echochamber/tinkering
[INFO] finished tweaking git repo https://github.com/echochamber/tinkering
[INFO] tweaked toml for git repo https://github.com/echochamber/tinkering written to /workspace/builds/worker-39/source/Cargo.toml
[INFO] crate git repo https://github.com/echochamber/tinkering already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--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 bytes v0.4.5
[INFO] [stderr]   Downloaded iovec v0.1.1
[INFO] [stderr]   Downloaded futures v0.1.17
[INFO] [stderr]   Downloaded log v0.3.8
[INFO] [stderr]   Downloaded winapi v0.2.8
[INFO] [stderr]   Downloaded net2 v0.2.31
[INFO] [stderr]   Downloaded redox_syscall v0.1.31
[INFO] [stderr]   Downloaded redox_termios v0.1.1
[INFO] [stderr]   Downloaded unicode-width v0.1.4
[INFO] [stderr]   Downloaded vec_map v0.8.0
[INFO] [stderr]   Downloaded rustc-demangle v0.1.5
[INFO] [stderr]   Downloaded termion v1.5.1
[INFO] [stderr]   Downloaded lazycell v0.5.1
[INFO] [stderr]   Downloaded miow v0.2.1
[INFO] [stderr]   Downloaded strsim v0.6.0
[INFO] [stderr]   Downloaded cfg-if v0.1.2
[INFO] [stderr]   Downloaded bitflags v0.7.0
[INFO] [stderr]   Downloaded ansi_term v0.9.0
[INFO] [stderr]   Downloaded ws2_32-sys v0.2.1
[INFO] [stderr]   Downloaded bitflags v0.9.1
[INFO] [stderr]   Downloaded textwrap v0.9.0
[INFO] [stderr]   Downloaded atty v0.2.3
[INFO] [stderr]   Downloaded clap v2.27.1
[INFO] [stderr]   Downloaded error-chain v0.11.0
[INFO] [stderr]   Downloaded tokio-core v0.1.10
[INFO] [stderr]   Downloaded tokio-io v0.1.4
[INFO] [stderr]   Downloaded dbghelp-sys v0.2.0
[INFO] [stderr]   Downloaded kernel32-sys v0.2.2
[INFO] [stderr]   Downloaded slab v0.3.0
[INFO] [stderr]   Downloaded scoped-tls v0.1.0
[INFO] [stderr]   Downloaded byteorder v1.1.0
[INFO] [stderr]   Downloaded mio v0.6.11
[INFO] [stderr]   Downloaded slab v0.4.0
[INFO] [stderr]   Downloaded libc v0.2.33
[INFO] [stderr]   Downloaded backtrace v0.3.4
[INFO] [stderr]   Downloaded fuchsia-zircon v0.2.1
[INFO] [stderr]   Downloaded cc v1.0.3
[INFO] [stderr]   Downloaded fuchsia-zircon-sys v0.2.0
[INFO] [stderr]   Downloaded backtrace-sys v0.1.16
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-39/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-39/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1947c22080f890c82ff6db4845db05cbb7f0e30185c466fdd14863572978487d
[INFO] running `Command { std: "docker" "start" "-a" "1947c22080f890c82ff6db4845db05cbb7f0e30185c466fdd14863572978487d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1947c22080f890c82ff6db4845db05cbb7f0e30185c466fdd14863572978487d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1947c22080f890c82ff6db4845db05cbb7f0e30185c466fdd14863572978487d", kill_on_drop: false }`
[INFO] [stdout] 1947c22080f890c82ff6db4845db05cbb7f0e30185c466fdd14863572978487d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-39/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-39/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4abebecb9bf89f8ff6030ca38090530c4a79666133e9c1de330507cd477e35c2
[INFO] running `Command { std: "docker" "start" "-a" "4abebecb9bf89f8ff6030ca38090530c4a79666133e9c1de330507cd477e35c2", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.33
[INFO] [stderr]     Checking cfg-if v0.1.2
[INFO] [stderr]    Compiling cc v1.0.3
[INFO] [stderr]     Checking log v0.3.8
[INFO] [stderr]     Checking byteorder v1.1.0
[INFO] [stderr]     Checking rustc-demangle v0.1.5
[INFO] [stderr]     Checking unicode-width v0.1.4
[INFO] [stderr]     Checking lazycell v0.5.1
[INFO] [stderr]     Checking slab v0.3.0
[INFO] [stderr]     Checking futures v0.1.17
[INFO] [stderr]     Checking vec_map v0.8.0
[INFO] [stderr]     Checking strsim v0.6.0
[INFO] [stderr]     Checking scoped-tls v0.1.0
[INFO] [stderr]     Checking bitflags v0.9.1
[INFO] [stderr]     Checking slab v0.4.0
[INFO] [stderr]     Checking textwrap v0.9.0
[INFO] [stderr]     Checking iovec v0.1.1
[INFO] [stderr]     Checking net2 v0.2.31
[INFO] [stderr]     Checking atty v0.2.3
[INFO] [stderr]     Checking termion v1.5.1
[INFO] [stderr]     Checking bytes v0.4.5
[INFO] [stderr]     Checking clap v2.27.1
[INFO] [stderr]     Checking mio v0.6.11
[INFO] [stderr]    Compiling backtrace-sys v0.1.16
[INFO] [stderr]     Checking tokio-io v0.1.4
[INFO] [stderr]     Checking tokio-core v0.1.10
[INFO] [stderr]     Checking backtrace v0.3.4
[INFO] [stderr]     Checking error-chain v0.11.0
[INFO] [stderr]  Documenting echo-edit 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:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(io)]
[INFO] [stdout]   |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `io`
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(io)]
[INFO] [stdout]   |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `echo-edit`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name echo_edit src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=d7cc283ffa5a53e8 -L dependency=/opt/rustwide/target/debug/deps --extern clap=/opt/rustwide/target/debug/deps/libclap-a6e6728617f6b514.rmeta --extern error_chain=/opt/rustwide/target/debug/deps/liberror_chain-199c92045932b772.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-150fcd9a288bba3f.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-31d53f89032b28f2.rmeta --extern termion=/opt/rustwide/target/debug/deps/libtermion-9847cc1206e3eb05.rmeta --extern tokio_core=/opt/rustwide/target/debug/deps/libtokio_core-27d7636b171bc2a1.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "4abebecb9bf89f8ff6030ca38090530c4a79666133e9c1de330507cd477e35c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4abebecb9bf89f8ff6030ca38090530c4a79666133e9c1de330507cd477e35c2", kill_on_drop: false }`
[INFO] [stdout] 4abebecb9bf89f8ff6030ca38090530c4a79666133e9c1de330507cd477e35c2