[INFO] cloning repository https://github.com/iovis/tuition
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/iovis/tuition" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiovis%2Ftuition", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiovis%2Ftuition'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 33029eefcaee4ffd3ca01d84220b6dcb14503a7a
[INFO] checking iovis/tuition against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiovis%2Ftuition" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/iovis/tuition on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/iovis/tuition
[INFO] finished tweaking git repo https://github.com/iovis/tuition
[INFO] tweaked toml for git repo https://github.com/iovis/tuition written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/iovis/tuition 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded indoc v2.0.4
[INFO] [stderr]   Downloaded lru v0.12.1
[INFO] [stderr]   Downloaded itertools v0.12.0
[INFO] [stderr]   Downloaded ratatui v0.25.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 42817cfb426a28f32306def2c58f2434994fe39ab2172cb23fcc46a629897bf8
[INFO] running `Command { std: "docker" "start" "-a" "42817cfb426a28f32306def2c58f2434994fe39ab2172cb23fcc46a629897bf8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "42817cfb426a28f32306def2c58f2434994fe39ab2172cb23fcc46a629897bf8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "42817cfb426a28f32306def2c58f2434994fe39ab2172cb23fcc46a629897bf8", kill_on_drop: false }`
[INFO] [stdout] 42817cfb426a28f32306def2c58f2434994fe39ab2172cb23fcc46a629897bf8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eb1c4efb3d0a28fe720e5a98e5bb3597fbf6256620ed3039ae277d1e2936e2d3
[INFO] running `Command { std: "docker" "start" "-a" "eb1c4efb3d0a28fe720e5a98e5bb3597fbf6256620ed3039ae277d1e2936e2d3", kill_on_drop: false }`
[INFO] [stderr]    Compiling parking_lot_core v0.9.9
[INFO] [stderr]    Compiling lock_api v0.4.11
[INFO] [stderr]     Checking smallvec v1.11.2
[INFO] [stderr]    Compiling ahash v0.8.7
[INFO] [stderr]    Compiling signal-hook v0.3.17
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]     Checking mio v0.8.10
[INFO] [stderr]     Checking zerocopy v0.7.32
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking allocator-api2 v0.2.16
[INFO] [stderr]     Checking either v1.9.0
[INFO] [stderr]     Checking signal-hook-mio v0.2.3
[INFO] [stderr]     Checking cassowary v0.3.0
[INFO] [stderr]     Checking parking_lot v0.12.1
[INFO] [stderr]    Compiling indoc v2.0.4
[INFO] [stderr]     Checking itertools v0.12.0
[INFO] [stderr]     Checking crossterm v0.27.0
[INFO] [stderr]     Checking unicode-segmentation v1.10.1
[INFO] [stderr]     Checking hashbrown v0.14.3
[INFO] [stderr]     Checking unicode-width v0.1.11
[INFO] [stderr]    Compiling anyhow v1.0.79
[INFO] [stderr]     Checking futures-channel v0.3.30
[INFO] [stderr]     Checking object v0.32.2
[INFO] [stderr]     Checking lru v0.12.1
[INFO] [stderr]     Checking backtrace v0.3.69
[INFO] [stderr]    Compiling stability v0.1.1
[INFO] [stderr]     Checking color-eyre v0.6.2
[INFO] [stderr]    Compiling strum_macros v0.25.3
[INFO] [stderr]    Compiling serde_derive v1.0.195
[INFO] [stderr]    Compiling futures-macro v0.3.30
[INFO] [stderr]    Compiling tokio-macros v2.2.0
[INFO] [stderr]     Checking tokio v1.35.1
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]     Checking strum v0.25.0
[INFO] [stderr]     Checking ratatui v0.25.0
[INFO] [stderr]     Checking a_counter v0.1.0 (/opt/rustwide/workdir/a_counter)
[INFO] [stderr]     Checking serde v1.0.195
[INFO] [stdout] warning: fields `sender` and `handler` are never read
[INFO] [stdout]   --> a_counter/src/event.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct EventHandler {
[INFO] [stdout]    |            ------------ fields in this struct
[INFO] [stdout] 18 |     sender: mpsc::Sender<Event>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 19 |     receiver: mpsc::Receiver<Event>,
[INFO] [stdout] 20 |     handler: thread::JoinHandle<()>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `EventHandler` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `sender` and `handler` are never read
[INFO] [stdout]   --> a_counter/src/event.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct EventHandler {
[INFO] [stdout]    |            ------------ fields in this struct
[INFO] [stdout] 18 |     sender: mpsc::Sender<Event>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 19 |     receiver: mpsc::Receiver<Event>,
[INFO] [stdout] 20 |     handler: thread::JoinHandle<()>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `EventHandler` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking futures-executor v0.3.30
[INFO] [stderr]     Checking futures v0.3.30
[INFO] [stderr]     Checking tokio-util v0.7.10
[INFO] [stderr]     Checking c_async_counter v0.1.0 (/opt/rustwide/workdir/c_async_counter)
[INFO] [stderr]     Checking serde_json v1.0.111
[INFO] [stderr]     Checking b_json_editor v0.1.0 (/opt/rustwide/workdir/b_json_editor)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 38.96s
[INFO] running `Command { std: "docker" "inspect" "eb1c4efb3d0a28fe720e5a98e5bb3597fbf6256620ed3039ae277d1e2936e2d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb1c4efb3d0a28fe720e5a98e5bb3597fbf6256620ed3039ae277d1e2936e2d3", kill_on_drop: false }`
[INFO] [stdout] eb1c4efb3d0a28fe720e5a98e5bb3597fbf6256620ed3039ae277d1e2936e2d3