[INFO] fetching crate semverver 0.1.46...
[INFO] documenting semverver-0.1.46 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate semverver 0.1.46 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate semverver 0.1.46 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate semverver 0.1.46
[INFO] finished tweaking crates.io crate semverver 0.1.46
[INFO] tweaked toml for crates.io crate semverver 0.1.46 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate crates.io crate semverver 0.1.46 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 37d0813b63602b9e005bcaca99fb2056f154804c4d273a60c48601173a65ffe2
[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" "37d0813b63602b9e005bcaca99fb2056f154804c4d273a60c48601173a65ffe2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "37d0813b63602b9e005bcaca99fb2056f154804c4d273a60c48601173a65ffe2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "37d0813b63602b9e005bcaca99fb2056f154804c4d273a60c48601173a65ffe2", kill_on_drop: false }`
[INFO] [stdout] 37d0813b63602b9e005bcaca99fb2056f154804c4d273a60c48601173a65ffe2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+1.46.0" "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] a2675c0e60b8b89278014233fdadee45d10d997f91997510a422f75901fa8b1d
[INFO] running `Command { std: "docker" "start" "-a" "a2675c0e60b8b89278014233fdadee45d10d997f91997510a422f75901fa8b1d", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.7
[INFO] [stderr]    Compiling curl v0.4.25
[INFO] [stderr]    Compiling openssl v0.10.25
[INFO] [stderr]     Checking rustc-workspace-hack v1.0.0
[INFO] [stderr]    Compiling semverver v0.1.46 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking home v0.5.3
[INFO] [stderr]     Checking opener v0.4.1
[INFO] [stderr]     Checking bytesize v1.0.0
[INFO] [stderr]    Compiling im-rc v14.3.0
[INFO] [stderr]    Compiling libc v0.2.65
[INFO] [stderr]     Checking strip-ansi-escapes v0.1.0
[INFO] [stderr]     Checking socket2 v0.3.11
[INFO] [stderr]     Checking filetime v0.2.7
[INFO] [stderr]     Checking num_cpus v1.11.0
[INFO] [stderr]     Checking fs2 v0.4.3
[INFO] [stderr]     Checking jobserver v0.1.17
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]     Checking bitmaps v2.1.0
[INFO] [stderr]     Checking bstr v0.2.8
[INFO] [stderr]     Checking unicode-normalization v0.1.9
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking rand_xoshiro v0.4.0
[INFO] [stderr]     Checking tar v0.4.26
[INFO] [stderr]     Checking rand v0.7.2
[INFO] [stderr]     Checking globset v0.4.4
[INFO] [stderr]    Compiling cc v1.0.47
[INFO] [stderr]     Checking idna v0.2.0
[INFO] [stderr]     Checking ignore v0.4.10
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]     Checking url v2.1.0
[INFO] [stderr]    Compiling openssl-sys v0.9.52
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling libnghttp2-sys v0.1.2
[INFO] [stderr]    Compiling curl-sys v0.4.24
[INFO] [stderr]    Compiling backtrace-sys v0.1.35
[INFO] [stderr]    Compiling libssh2-sys v0.2.13
[INFO] [stderr]    Compiling libgit2-sys v0.9.2
[INFO] [stderr]     Checking flate2 v1.0.12
[INFO] [stderr]     Checking backtrace v0.3.46
[INFO] [stderr]     Checking sized-chunks v0.5.3
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling serde_derive v1.0.102
[INFO] [stderr]    Compiling failure_derive v0.1.7
[INFO] [stderr]     Checking crypto-hash v0.3.4
[INFO] [stderr]     Checking git2 v0.10.2
[INFO] [stderr]     Checking failure v0.1.7
[INFO] [stderr]     Checking git2-curl v0.11.0
[INFO] [stderr]     Checking serde v1.0.102
[INFO] [stderr]     Checking serde_json v1.0.41
[INFO] [stderr]     Checking semver v0.9.0
[INFO] [stderr]     Checking cargo-platform v0.1.1
[INFO] [stderr]     Checking serde_ignored v0.1.1
[INFO] [stderr]     Checking toml v0.5.5
[INFO] [stderr]     Checking rustfix v0.4.6
[INFO] [stderr]     Checking crates-io v0.30.0
[INFO] [stderr]     Checking cargo v0.42.0
[INFO] [stderr]  Documenting semverver v0.1.46 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0463]: can't find crate for `rustc_ast`
[INFO] [stdout]  --> src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | extern crate rustc_ast;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
[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 E0463`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `semverver`.
[INFO] [stdout] error[E0463]: can't find crate for `rustc_ast`
[INFO] [stdout]  --> src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | extern crate rustc_ast;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] Caused by:
[INFO] [stdout] For more information about this error, try `rustc --explain E0463`.
[INFO] [stdout] 
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name semverver 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 cargo=/opt/rustwide/target/debug/deps/libcargo-69aae20639e57e7a.rmeta --extern crates_io=/opt/rustwide/target/debug/deps/libcrates_io-5943c6be0dfae34a.rmeta --extern curl=/opt/rustwide/target/debug/deps/libcurl-405eecf74c1ef2c7.rmeta --extern env_logger=/opt/rustwide/target/debug/deps/libenv_logger-6554716af897430b.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-7b3142c06598dd4d.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-f96ba0118540bef9.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-b54d34981a20a6ef.rmeta --extern semver=/opt/rustwide/target/debug/deps/libsemver-4670e3ed647cba6e.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-7323f7991428d63d.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-1888075b830baca3.rmeta --cap-lints=warn` (exit code: 1)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "a2675c0e60b8b89278014233fdadee45d10d997f91997510a422f75901fa8b1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a2675c0e60b8b89278014233fdadee45d10d997f91997510a422f75901fa8b1d", kill_on_drop: false }`
[INFO] [stdout] a2675c0e60b8b89278014233fdadee45d10d997f91997510a422f75901fa8b1d