[INFO] cloning repository https://github.com/datrs/dat
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/datrs/dat" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdatrs%2Fdat", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdatrs%2Fdat'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 667adbb65a6a71590a1ed834b3241ca270d1d58f
[INFO] checking datrs/dat against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdatrs%2Fdat" "/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/datrs/dat on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/datrs/dat
[INFO] finished tweaking git repo https://github.com/datrs/dat
[INFO] tweaked toml for git repo https://github.com/datrs/dat written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/datrs/dat already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "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] d48f1b8d077092ef59eac00cc096765b6df5461747d832d59e306498870055d2
[INFO] running `Command { std: "docker" "start" "-a" "d48f1b8d077092ef59eac00cc096765b6df5461747d832d59e306498870055d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d48f1b8d077092ef59eac00cc096765b6df5461747d832d59e306498870055d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d48f1b8d077092ef59eac00cc096765b6df5461747d832d59e306498870055d2", kill_on_drop: false }`
[INFO] [stdout] d48f1b8d077092ef59eac00cc096765b6df5461747d832d59e306498870055d2
[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" "RUSTFLAGS=--cap-lints=forbid" "-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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--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] 6ba59221fc4b94e30776a6517e682f9a099037af8fc2b3ac7569e04aebc860f0
[INFO] running `Command { std: "docker" "start" "-a" "6ba59221fc4b94e30776a6517e682f9a099037af8fc2b3ac7569e04aebc860f0", kill_on_drop: false }`
[INFO] [stderr]    Compiling regex v1.0.1
[INFO] [stderr]    Compiling utf8-ranges v1.0.0
[INFO] [stderr]     Checking dat v0.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling regex-syntax v0.6.1
[INFO] [stderr]    Compiling memchr v2.0.1
[INFO] [stderr]    Compiling pulldown-cmark v0.1.2
[INFO] [stderr]    Compiling itertools v0.7.8
[INFO] [stderr]    Compiling idna v0.1.4
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling serde_json v1.0.21
[INFO] [stderr]    Compiling toml v0.4.6
[INFO] [stderr]    Compiling thread_local v0.3.5
[INFO] [stderr]    Compiling num-traits v0.2.6
[INFO] [stderr]    Compiling backtrace-sys v0.1.23
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![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 `dat`
[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" "6ba59221fc4b94e30776a6517e682f9a099037af8fc2b3ac7569e04aebc860f0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ba59221fc4b94e30776a6517e682f9a099037af8fc2b3ac7569e04aebc860f0", kill_on_drop: false }`
[INFO] [stdout] 6ba59221fc4b94e30776a6517e682f9a099037af8fc2b3ac7569e04aebc860f0