[INFO] fetching crate os-xtask-utils 0.0.0...
[INFO] testing os-xtask-utils-0.0.0 against master#caccb4d0368bd918ef6668af8e13834d07040417 for pr-146098-1
[INFO] extracting crate os-xtask-utils 0.0.0 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate os-xtask-utils 0.0.0
[INFO] finished tweaking crates.io crate os-xtask-utils 0.0.0
[INFO] tweaked toml for crates.io crate os-xtask-utils 0.0.0 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate os-xtask-utils 0.0.0 on toolchain caccb4d0368bd918ef6668af8e13834d07040417
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+caccb4d0368bd918ef6668af8e13834d07040417" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+caccb4d0368bd918ef6668af8e13834d07040417" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 1 package to latest compatible version
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+caccb4d0368bd918ef6668af8e13834d07040417" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+caccb4d0368bd918ef6668af8e13834d07040417" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f3e134d80a844d251be0eca3c8b473a0c69b9908c12bbd5ce1e19dcc44789ddc
[INFO] running `Command { std: "docker" "start" "-a" "f3e134d80a844d251be0eca3c8b473a0c69b9908c12bbd5ce1e19dcc44789ddc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f3e134d80a844d251be0eca3c8b473a0c69b9908c12bbd5ce1e19dcc44789ddc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f3e134d80a844d251be0eca3c8b473a0c69b9908c12bbd5ce1e19dcc44789ddc", kill_on_drop: false }`
[INFO] [stdout] f3e134d80a844d251be0eca3c8b473a0c69b9908c12bbd5ce1e19dcc44789ddc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+caccb4d0368bd918ef6668af8e13834d07040417" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5ff021072d450be00cf6f8fbf3e1bc511a274461045a728620629c35f346f1dc
[INFO] running `Command { std: "docker" "start" "-a" "5ff021072d450be00cf6f8fbf3e1bc511a274461045a728620629c35f346f1dc", kill_on_drop: false }`
[INFO] [stderr]    Compiling os-xtask-utils v0.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: variable does not need to be mutable
[INFO] [stdout]   --> src/qemu.rs:48:18
[INFO] [stdout]    |
[INFO] [stdout] 48 |     fn find_qemu(mut name: OsString) -> OsString {
[INFO] [stdout]    |                  ----^^^^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> src/lib.rs:1:9
[INFO] [stdout]    |
[INFO] [stdout]  1 | #![deny(warnings, unsafe_code)]
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    = note: `#[deny(unused_mut)]` implied by `#[deny(warnings)]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `os-xtask-utils` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "5ff021072d450be00cf6f8fbf3e1bc511a274461045a728620629c35f346f1dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5ff021072d450be00cf6f8fbf3e1bc511a274461045a728620629c35f346f1dc", kill_on_drop: false }`
[INFO] [stdout] 5ff021072d450be00cf6f8fbf3e1bc511a274461045a728620629c35f346f1dc