[INFO] cloning repository https://github.com/EnsicoinDevs/ensicoin-serializer
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/EnsicoinDevs/ensicoin-serializer" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEnsicoinDevs%2Fensicoin-serializer", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEnsicoinDevs%2Fensicoin-serializer'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9e16c70654685c398ab909f3590e6d190459dc89
[INFO] checking EnsicoinDevs/ensicoin-serializer against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEnsicoinDevs%2Fensicoin-serializer" "/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/EnsicoinDevs/ensicoin-serializer 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/EnsicoinDevs/ensicoin-serializer
[INFO] finished tweaking git repo https://github.com/EnsicoinDevs/ensicoin-serializer
[INFO] tweaked toml for git repo https://github.com/EnsicoinDevs/ensicoin-serializer written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/EnsicoinDevs/ensicoin-serializer 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]     Updating crates.io index
[INFO] [stderr]      Locking 1 package
[INFO] [stderr]     Updating ensicoin_serializer v2.0.7 (/workspace/builds/worker-4-tc1/source/ensicoin-serializer) -> v2.0.9
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded proc-macro2 v1.0.3
[INFO] [stderr]   Downloaded ensicoin_serializer v2.0.7
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1c0c6012eeb1fd5c27124bbf4251024b99c5e8c391481cf5a9551cd5dfd12341
[INFO] running `Command { std: "docker" "start" "-a" "1c0c6012eeb1fd5c27124bbf4251024b99c5e8c391481cf5a9551cd5dfd12341", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1c0c6012eeb1fd5c27124bbf4251024b99c5e8c391481cf5a9551cd5dfd12341", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1c0c6012eeb1fd5c27124bbf4251024b99c5e8c391481cf5a9551cd5dfd12341", kill_on_drop: false }`
[INFO] [stdout] 1c0c6012eeb1fd5c27124bbf4251024b99c5e8c391481cf5a9551cd5dfd12341
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 00435a55cca8a55eb9ae371b4114cc6c45dd0093329d2ffab4035e2eaa46cc48
[INFO] running `Command { std: "docker" "start" "-a" "00435a55cca8a55eb9ae371b4114cc6c45dd0093329d2ffab4035e2eaa46cc48", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.3
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling typenum v1.11.2
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]     Checking unicode-xid v0.2.0
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking quote v1.0.2
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking generic-array v0.12.3
[INFO] [stderr]     Checking ensicoin_serializer v2.0.7
[INFO] [stderr]     Checking ensicoin_serializer v2.0.9 (/opt/rustwide/workdir/ensicoin-serializer)
[INFO] [stderr]     Checking ensicoin_serializer_derive v0.2.7 (/opt/rustwide/workdir/ensicoin_serializer_derive)
[INFO] [stdout] warning: the item `syn` is imported redundantly
[INFO] [stdout]  --> ensicoin_serializer_derive/src/lib.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use syn;
[INFO] [stdout]   |     ^^^ the item `syn` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `syn` is imported redundantly
[INFO] [stdout]  --> ensicoin_serializer_derive/src/lib.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use syn;
[INFO] [stdout]   |     ^^^ the item `syn` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `syn` is imported redundantly
[INFO] [stdout]  --> ensicoin_serializer_derive/src/lib.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use syn;
[INFO] [stdout]   |     ^^^ the item `syn` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` 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 10.01s
[INFO] running `Command { std: "docker" "inspect" "00435a55cca8a55eb9ae371b4114cc6c45dd0093329d2ffab4035e2eaa46cc48", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "00435a55cca8a55eb9ae371b4114cc6c45dd0093329d2ffab4035e2eaa46cc48", kill_on_drop: false }`
[INFO] [stdout] 00435a55cca8a55eb9ae371b4114cc6c45dd0093329d2ffab4035e2eaa46cc48