[INFO] cloning repository https://github.com/fexolm/jfec
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/fexolm/jfec" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffexolm%2Fjfec", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffexolm%2Fjfec'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6de42e1766324b065d6ef53eb278677017d115bc
[INFO] documenting fexolm/jfec 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%2Ffexolm%2Fjfec" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/fexolm/jfec 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/fexolm/jfec
[INFO] finished tweaking git repo https://github.com/fexolm/jfec
[INFO] tweaked toml for git repo https://github.com/fexolm/jfec written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/fexolm/jfec 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]     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 ucd-trie v0.1.1
[INFO] [stderr]   Downloaded cast v0.1.0
[INFO] [stderr]   Downloaded itertools v0.4.19
[INFO] [stderr]   Downloaded criterion-plot v0.1.3
[INFO] [stderr]   Downloaded criterion-stats v0.1.3
[INFO] [stderr]   Downloaded criterion v0.1.2
[INFO] [stderr]   Downloaded simplelog v0.4.4
[INFO] [stderr]   Downloaded cc v1.0.31
[INFO] [stderr]   Downloaded pest_meta v2.1.0
[INFO] [stderr]   Downloaded sha-1 v0.7.0
[INFO] [stderr]   Downloaded llvm-sys v70.1.0
[INFO] [stderr]   Downloaded pest v2.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] [stdout] 6deb77621c20b739b3d60a1a20756c665d30ebd85e2102debd625562dbf6b4d3
[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" "6deb77621c20b739b3d60a1a20756c665d30ebd85e2102debd625562dbf6b4d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6deb77621c20b739b3d60a1a20756c665d30ebd85e2102debd625562dbf6b4d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6deb77621c20b739b3d60a1a20756c665d30ebd85e2102debd625562dbf6b4d3", kill_on_drop: false }`
[INFO] [stdout] 6deb77621c20b739b3d60a1a20756c665d30ebd85e2102debd625562dbf6b4d3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] 62155991c93f773eea2ec0093f1006908c19a143a11b3e4c4a7874fd7eee390c
[INFO] running `Command { std: "docker" "start" "-a" "62155991c93f773eea2ec0093f1006908c19a143a11b3e4c4a7874fd7eee390c", kill_on_drop: false }`
[INFO] [stderr]    Compiling regex v1.1.5
[INFO] [stderr]    Compiling syn v0.15.29
[INFO] [stderr]    Compiling cc v1.0.31
[INFO] [stderr]    Compiling regex-syntax v0.6.6
[INFO] [stderr]    Compiling pest v2.1.0
[INFO] [stderr]     Checking itertools v0.8.0
[INFO] [stderr]    Compiling pest_meta v2.1.0
[INFO] [stderr]    Compiling pest_generator v2.1.0
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]    Compiling llvm-sys v70.1.0
[INFO] [stderr]     Checking jfec v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting jfec v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `AsRef` is imported redundantly
[INFO] [stdout]   --> src/codegen/ssa/instruction.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |         use std::convert::AsRef;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 49.49s
[INFO] running `Command { std: "docker" "inspect" "62155991c93f773eea2ec0093f1006908c19a143a11b3e4c4a7874fd7eee390c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "62155991c93f773eea2ec0093f1006908c19a143a11b3e4c4a7874fd7eee390c", kill_on_drop: false }`
[INFO] [stdout] 62155991c93f773eea2ec0093f1006908c19a143a11b3e4c4a7874fd7eee390c