[INFO] fetching crate magic-wormhole 0.0.2...
[INFO] documenting magic-wormhole-0.0.2 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate magic-wormhole 0.0.2 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate magic-wormhole 0.0.2 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate magic-wormhole 0.0.2
[INFO] finished tweaking crates.io crate magic-wormhole 0.0.2
[INFO] tweaked toml for crates.io crate magic-wormhole 0.0.2 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate crates.io crate magic-wormhole 0.0.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded proc-macro2 v1.0.2
[INFO] [stderr]   Downloaded ws v0.9.0
[INFO] [stderr]   Downloaded subtle v2.1.1
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[INFO] [stderr]   Downloaded rustyline v5.0.2
[INFO] [stderr]   Downloaded libsodium-sys v0.2.2
[INFO] [stderr]   Downloaded sodiumoxide v0.2.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 96f543cfc143e3c54e60e42c1fdd0a5f22d9768927ff55880bf07dd6481ca220
[INFO] running `Command { std: "docker" "start" "-a" "96f543cfc143e3c54e60e42c1fdd0a5f22d9768927ff55880bf07dd6481ca220", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "96f543cfc143e3c54e60e42c1fdd0a5f22d9768927ff55880bf07dd6481ca220", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "96f543cfc143e3c54e60e42c1fdd0a5f22d9768927ff55880bf07dd6481ca220", kill_on_drop: false }`
[INFO] [stdout] 96f543cfc143e3c54e60e42c1fdd0a5f22d9768927ff55880bf07dd6481ca220
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6659a92db5cc621da9638f17ad30b5daba1dd4880d1459477f11e50f9fdc3507
[INFO] running `Command { std: "docker" "start" "-a" "6659a92db5cc621da9638f17ad30b5daba1dd4880d1459477f11e50f9fdc3507", kill_on_drop: false }`
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling typenum v1.11.2
[INFO] [stderr]     Checking futures v0.1.28
[INFO] [stderr]    Compiling pkg-config v0.3.15
[INFO] [stderr]    Compiling arrayvec v0.4.11
[INFO] [stderr]    Compiling rle-decode-fast v1.0.1
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[INFO] [stderr]    Compiling getrandom v0.1.11
[INFO] [stderr]    Compiling adler32 v1.0.3
[INFO] [stderr]     Checking subtle v1.0.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.2
[INFO] [stderr]    Compiling subtle v2.1.1
[INFO] [stderr]    Compiling serde v1.0.99
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]     Checking safemem v0.3.2
[INFO] [stderr]     Checking ppv-lite86 v0.2.5
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[INFO] [stderr]     Checking ws v0.9.0
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[INFO] [stderr]     Checking tokio-fs v0.1.6
[INFO] [stderr]     Checking tokio-tcp v0.1.3
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[INFO] [stderr]     Checking tokio-core v0.1.17
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[INFO] [stderr]    Compiling serde_derive v1.0.99
[INFO] [stderr]     Checking tokio-tls v0.2.1
[INFO] [stderr]     Checking websocket v0.23.0
[INFO] [stderr]     Checking sodiumoxide v0.2.2
[INFO] [stderr]     Checking magic-wormhole v0.0.2 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting magic-wormhole v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] error: unused return value of `std::string::String::split_off` that must be used
[INFO] [stdout]   --> src/core/wordlist.rs:42:21
[INFO] [stdout]    |
[INFO] [stdout] 42 |                     suffix.split_off(p as usize);
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> src/lib.rs:2:9
[INFO] [stdout]    |
[INFO] [stdout] 2  | #![deny(warnings)]
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    = note: `#[deny(unused_must_use)]` implied by `#[deny(warnings)]`
[INFO] [stdout]    = note: use `.truncate()` if you don't need the other half
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `magic-wormhole` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "6659a92db5cc621da9638f17ad30b5daba1dd4880d1459477f11e50f9fdc3507", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6659a92db5cc621da9638f17ad30b5daba1dd4880d1459477f11e50f9fdc3507", kill_on_drop: false }`
[INFO] [stdout] 6659a92db5cc621da9638f17ad30b5daba1dd4880d1459477f11e50f9fdc3507
