[INFO] fetching crate pretty-exec 0.0.17...
[INFO] documenting pretty-exec-0.0.17 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate pretty-exec 0.0.17 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate pretty-exec 0.0.17 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 crates.io crate pretty-exec 0.0.17
[INFO] finished tweaking crates.io crate pretty-exec 0.0.17
[INFO] tweaked toml for crates.io crate pretty-exec 0.0.17 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate pretty-exec 0.0.17 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 pretty-exec-lib v0.0.17
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] 09c5a2db898ed4d8ea441906c6725ad390b28e7a266320c0414394069b1dc2d3
[INFO] running `Command { std: "docker" "start" "-a" "09c5a2db898ed4d8ea441906c6725ad390b28e7a266320c0414394069b1dc2d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "09c5a2db898ed4d8ea441906c6725ad390b28e7a266320c0414394069b1dc2d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "09c5a2db898ed4d8ea441906c6725ad390b28e7a266320c0414394069b1dc2d3", kill_on_drop: false }`
[INFO] [stdout] 09c5a2db898ed4d8ea441906c6725ad390b28e7a266320c0414394069b1dc2d3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] 310ccd5674c9adcbeaf2d10c4b97ccf04fcc2f0c3671f842d55d27318aaca28f
[INFO] running `Command { std: "docker" "start" "-a" "310ccd5674c9adcbeaf2d10c4b97ccf04fcc2f0c3671f842d55d27318aaca28f", kill_on_drop: false }`
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `pretty-exec` in package `pretty-exec v0.0.17 (/opt/rustwide/workdir)` has the same output filename as the lib target `pretty_exec` in package `pretty-exec v0.0.17 (/opt/rustwide/workdir)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/doc/pretty_exec/index.html
[INFO] [stderr] The output filenames should be unique.
[INFO] [stderr] This is a known bug where multiple crates with the same name use
[INFO] [stderr] the same path; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] If this looks unexpected, it may be a bug in Cargo. Please file a bug report at
[INFO] [stderr] https://github.com/rust-lang/cargo/issues/ with as much information as you
[INFO] [stderr] can provide.
[INFO] [stderr] cargo 1.47.0-beta (51b66125b 2020-08-19) running on `x86_64-unknown-linux-gnu` target `x86_64-unknown-linux-gnu`
[INFO] [stderr] First unit: Unit { pkg: Package { id: PackageId { name: "pretty-exec", version: "0.0.17", source: "/opt/rustwide/workdir" }, ..: ".." }, target: TargetInner { name: "pretty-exec", doc: true, ..: with_path("/opt/rustwide/workdir/src/main.rs", Edition2018) }, profile: Profile { name: "doc", debuginfo: Some(2), debug_assertions: true, overflow_checks: true, ..: default() }, kind: Host, mode: Doc { deps: false }, features: [] }
[INFO] [stderr] Second unit: Unit { pkg: Package { id: PackageId { name: "pretty-exec", version: "0.0.17", source: "/opt/rustwide/workdir" }, ..: ".." }, target: TargetInner { ..: lib_target("pretty_exec", ["lib"], "/opt/rustwide/workdir/src/lib.rs", Edition2018) }, profile: Profile { name: "doc", debuginfo: Some(2), debug_assertions: true, overflow_checks: true, ..: default() }, kind: Host, mode: Doc { deps: false }, features: [] }
[INFO] [stderr]    Compiling syn v1.0.33
[INFO] [stderr]     Checking shell-escape v0.1.5
[INFO] [stderr]     Checking pipe-trait v0.2.0
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.2
[INFO] [stderr]    Compiling proc-macro-error v1.0.2
[INFO] [stderr]     Checking clap v2.33.1
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling structopt-derive v0.4.8
[INFO] [stderr]     Checking structopt v0.3.15
[INFO] [stderr]     Checking pretty-exec-lib v0.0.17
[INFO] [stderr]     Checking pretty-exec v0.0.17 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting pretty-exec v0.0.17 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 19.74s
[INFO] running `Command { std: "docker" "inspect" "310ccd5674c9adcbeaf2d10c4b97ccf04fcc2f0c3671f842d55d27318aaca28f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "310ccd5674c9adcbeaf2d10c4b97ccf04fcc2f0c3671f842d55d27318aaca28f", kill_on_drop: false }`
[INFO] [stdout] 310ccd5674c9adcbeaf2d10c4b97ccf04fcc2f0c3671f842d55d27318aaca28f