[INFO] fetching crate dex 0.4.0...
[INFO] documenting dex-0.4.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate dex 0.4.0 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate dex 0.4.0 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 dex 0.4.0
[INFO] finished tweaking crates.io crate dex 0.4.0
[INFO] tweaked toml for crates.io crate dex 0.4.0 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate crates.io crate dex 0.4.0 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 lru v0.1.17
[INFO] [stderr]   Downloaded scroll v0.9.2
[INFO] [stderr]   Downloaded scroll_derive v0.9.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] 8d12392e8ef1d766c66fd409dcf66daa05c38d53b7de769fa85f6e92375ce182
[INFO] running `Command { std: "docker" "start" "-a" "8d12392e8ef1d766c66fd409dcf66daa05c38d53b7de769fa85f6e92375ce182", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8d12392e8ef1d766c66fd409dcf66daa05c38d53b7de769fa85f6e92375ce182", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d12392e8ef1d766c66fd409dcf66daa05c38d53b7de769fa85f6e92375ce182", kill_on_drop: false }`
[INFO] [stdout] 8d12392e8ef1d766c66fd409dcf66daa05c38d53b7de769fa85f6e92375ce182
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] [stdout] 21f4a72ccc0c2072a2c0cb0b0bf1cf6130d83624d36b6f9774aa6c923389894e
[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" "21f4a72ccc0c2072a2c0cb0b0bf1cf6130d83624d36b6f9774aa6c923389894e", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.6
[INFO] [stderr]    Compiling num-derive v0.2.5
[INFO] [stderr]     Checking hashbrown v0.5.0
[INFO] [stderr]     Checking cesu8 v1.1.0
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling scroll v0.9.2
[INFO] [stderr]     Checking memmap v0.7.0
[INFO] [stderr]    Compiling scroll_derive v0.9.5
[INFO] [stderr]     Checking lru v0.1.17
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]    Compiling syn v1.0.8
[INFO] [stderr]    Compiling getset v0.0.9
[INFO] [stderr]  Documenting dex v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]   --> src/dex.rs:98:9
[INFO] [stdout]    |
[INFO] [stdout] 98 |         (self.data_off..self.data_off + self.data_size)
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` 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 21.61s
[INFO] running `Command { std: "docker" "inspect" "21f4a72ccc0c2072a2c0cb0b0bf1cf6130d83624d36b6f9774aa6c923389894e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "21f4a72ccc0c2072a2c0cb0b0bf1cf6130d83624d36b6f9774aa6c923389894e", kill_on_drop: false }`
[INFO] [stdout] 21f4a72ccc0c2072a2c0cb0b0bf1cf6130d83624d36b6f9774aa6c923389894e