[INFO] fetching crate aria2-ws 0.4.0...
[INFO] checking aria2-ws-0.4.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate aria2-ws 0.4.0 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate aria2-ws 0.4.0 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 crates.io crate aria2-ws 0.4.0
[INFO] finished tweaking crates.io crate aria2-ws 0.4.0
[INFO] tweaked toml for crates.io crate aria2-ws 0.4.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
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[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 }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 6d2fcd7e2f7731b16fd519f98be3c91c70c9d678cfc50e20537a091651fdf4e2
[INFO] running `Command { std: "docker" "start" "-a" "6d2fcd7e2f7731b16fd519f98be3c91c70c9d678cfc50e20537a091651fdf4e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6d2fcd7e2f7731b16fd519f98be3c91c70c9d678cfc50e20537a091651fdf4e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d2fcd7e2f7731b16fd519f98be3c91c70c9d678cfc50e20537a091651fdf4e2", kill_on_drop: false }`
[INFO] [stdout] 6d2fcd7e2f7731b16fd519f98be3c91c70c9d678cfc50e20537a091651fdf4e2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] de941f0068b0edc94e4498b3a7e85db5cf51e70423a6abb506a6ea38c492ebc9
[INFO] running `Command { std: "docker" "start" "-a" "de941f0068b0edc94e4498b3a7e85db5cf51e70423a6abb506a6ea38c492ebc9", kill_on_drop: false }`
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[INFO] [stdout] warning: method `push_value` is never used
[INFO] [stdout]   --> src/utils.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 8  | pub trait PushExt {
[INFO] [stdout]    |           ------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 13 |     fn push_value<T: Serialize>(&mut self, t: T) -> Result<()>;
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout]    |
[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: method `push_value` is never used
[INFO] [stdout]   --> src/utils.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 8  | pub trait PushExt {
[INFO] [stdout]    |           ------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 13 |     fn push_value<T: Serialize>(&mut self, t: T) -> Result<()>;
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout]    |
[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]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 15.59s
[INFO] running `Command { std: "docker" "inspect" "de941f0068b0edc94e4498b3a7e85db5cf51e70423a6abb506a6ea38c492ebc9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de941f0068b0edc94e4498b3a7e85db5cf51e70423a6abb506a6ea38c492ebc9", kill_on_drop: false }`
[INFO] [stdout] de941f0068b0edc94e4498b3a7e85db5cf51e70423a6abb506a6ea38c492ebc9