[INFO] cloning repository https://github.com/weykon/bit-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/weykon/bit-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fweykon%2Fbit-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fweykon%2Fbit-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a1549009a730c218dc091734b898fdf36377d19f
[INFO] checking weykon/bit-playground against master#2fcf1776b9ccef89993dfe40e9f5c4908e2d2d48 for pr-142723
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fweykon%2Fbit-playground" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/weykon/bit-playground on toolchain 2fcf1776b9ccef89993dfe40e9f5c4908e2d2d48
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2fcf1776b9ccef89993dfe40e9f5c4908e2d2d48" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/weykon/bit-playground
[INFO] finished tweaking git repo https://github.com/weykon/bit-playground
[INFO] tweaked toml for git repo https://github.com/weykon/bit-playground written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/weykon/bit-playground 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" "+2fcf1776b9ccef89993dfe40e9f5c4908e2d2d48" "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-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+2fcf1776b9ccef89993dfe40e9f5c4908e2d2d48" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6d372060e23ceae8907ae3ed2dfdb1666f3621a1b875ac3dc69c57758fe984a9
[INFO] running `Command { std: "docker" "start" "-a" "6d372060e23ceae8907ae3ed2dfdb1666f3621a1b875ac3dc69c57758fe984a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6d372060e23ceae8907ae3ed2dfdb1666f3621a1b875ac3dc69c57758fe984a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d372060e23ceae8907ae3ed2dfdb1666f3621a1b875ac3dc69c57758fe984a9", kill_on_drop: false }`
[INFO] [stdout] 6d372060e23ceae8907ae3ed2dfdb1666f3621a1b875ac3dc69c57758fe984a9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+2fcf1776b9ccef89993dfe40e9f5c4908e2d2d48" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4e9489b39d89206f08132830ddb7dd9262723669705799c4e4dc8605d8d32757
[INFO] running `Command { std: "docker" "start" "-a" "4e9489b39d89206f08132830ddb7dd9262723669705799c4e4dc8605d8d32757", kill_on_drop: false }`
[INFO] [stderr]     Checking bit_playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value passed to `x` is never read
[INFO] [stdout]  --> src/mission_list/_8.rs:2:27
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn a_bit_negation(mut x: u32, pos: usize) -> u32 {
[INFO] [stdout]   |                           ^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout]   = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value passed to `x` is never read
[INFO] [stdout]  --> src/mission_list/_8.rs:2:27
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn a_bit_negation(mut x: u32, pos: usize) -> u32 {
[INFO] [stdout]   |                           ^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout]   = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.12s
[INFO] running `Command { std: "docker" "inspect" "4e9489b39d89206f08132830ddb7dd9262723669705799c4e4dc8605d8d32757", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e9489b39d89206f08132830ddb7dd9262723669705799c4e4dc8605d8d32757", kill_on_drop: false }`
[INFO] [stdout] 4e9489b39d89206f08132830ddb7dd9262723669705799c4e4dc8605d8d32757