[INFO] fetching crate heterob 0.4.0...
[INFO] checking heterob-0.4.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate heterob 0.4.0 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate heterob 0.4.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate heterob 0.4.0
[INFO] tweaked toml for crates.io crate heterob 0.4.0 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate heterob 0.4.0 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate heterob 0.4.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3a9714201c87da844aac4dc60a85c777ae18c333c164d8aa6e11dfcb69acfc72
[INFO] running `Command { std: "docker" "start" "-a" "3a9714201c87da844aac4dc60a85c777ae18c333c164d8aa6e11dfcb69acfc72", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3a9714201c87da844aac4dc60a85c777ae18c333c164d8aa6e11dfcb69acfc72", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3a9714201c87da844aac4dc60a85c777ae18c333c164d8aa6e11dfcb69acfc72", kill_on_drop: false }`
[INFO] [stdout] 3a9714201c87da844aac4dc60a85c777ae18c333c164d8aa6e11dfcb69acfc72
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "RUSTFLAGS=--cap-lints=forbid -Dunmustuse_in_always_ok" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e9b65a2078bb48fa9943fecf56b82679829687ee40a02f47ace3128e584da0e0
[INFO] running `Command { std: "docker" "start" "-a" "e9b65a2078bb48fa9943fecf56b82679829687ee40a02f47ace3128e584da0e0", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.203
[INFO] [stderr]    Compiling proc-macro2 v1.0.85
[INFO] [stderr]     Checking either v1.12.0
[INFO] [stderr]    Compiling serde_json v1.0.117
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]     Checking unicode-width v0.1.13
[INFO] [stderr]     Checking regex-syntax v0.8.4
[INFO] [stderr]     Checking plotters-backend v0.3.6
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking csv-core v0.1.11
[INFO] [stderr]     Checking plotters-svg v0.3.6
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking itertools v0.10.5
[INFO] [stderr]     Checking rayon v1.10.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking oorandom v11.1.3
[INFO] [stderr]     Checking heterob v0.4.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling quote v1.0.36
[INFO] [stderr]     Checking regex-automata v0.4.7
[INFO] [stderr]    Compiling syn v2.0.66
[INFO] [stderr]     Checking plotters v0.3.6
[INFO] [stderr]     Checking criterion-plot v0.4.5
[INFO] [stderr]     Checking regex v1.10.5
[INFO] [stderr]     Checking csv v1.3.0
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stderr]    Compiling serde_derive v1.0.203
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking criterion v0.3.6
[INFO] [stdout] error: this type will no longer be must used: Result<&[char], Infallible>
[INFO] [stdout]   --> examples/main.rs:12:27
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let sample: &[char] = data[..3].try_into().unwrap();
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `heterob` (example "main" test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "e9b65a2078bb48fa9943fecf56b82679829687ee40a02f47ace3128e584da0e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e9b65a2078bb48fa9943fecf56b82679829687ee40a02f47ace3128e584da0e0", kill_on_drop: false }`
[INFO] [stdout] e9b65a2078bb48fa9943fecf56b82679829687ee40a02f47ace3128e584da0e0
