[INFO] fetching crate destream_json 0.12.0...
[INFO] checking destream_json-0.12.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate destream_json 0.12.0 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate destream_json 0.12.0 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 destream_json 0.12.0
[INFO] finished tweaking crates.io crate destream_json 0.12.0
[INFO] tweaked toml for crates.io crate destream_json 0.12.0 written to /workspace/builds/worker-1-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
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 68 packages
[INFO] [stderr]       Adding attribute-derive v0.6.1 (latest: v0.9.1)
[INFO] [stderr]       Adding attribute-derive-macro v0.6.1 (latest: v0.9.1)
[INFO] [stderr]       Adding base64 v0.21.7 (latest: v0.22.0)
[INFO] [stderr]       Adding object v0.32.2 (latest: v0.34.0)
[INFO] [stderr]       Adding proc-macro-utils v0.8.0 (latest: v0.9.1)
[INFO] [stderr]       Adding quote-use v0.7.2 (latest: v0.8.0)
[INFO] [stderr]       Adding quote-use-macros v0.7.2 (latest: v0.8.0)
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.58)
[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]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tokio-test v0.4.4
[INFO] [stderr]   Downloaded get-size-derive v0.1.3
[INFO] [stderr]   Downloaded get-size v0.1.4
[INFO] [stderr]   Downloaded attribute-derive-macro v0.6.1
[INFO] [stderr]   Downloaded safecast v0.2.2
[INFO] [stderr]   Downloaded destream v0.7.3
[INFO] [stderr]   Downloaded attribute-derive v0.6.1
[INFO] [stderr]   Downloaded collate v0.4.1
[INFO] [stderr]   Downloaded number-general v0.11.1
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 683d58d31ef9b06f0c9f1b8b107f3de6f921ed1932b4003eb6cf5ddf666c92e1
[INFO] running `Command { std: "docker" "start" "-a" "683d58d31ef9b06f0c9f1b8b107f3de6f921ed1932b4003eb6cf5ddf666c92e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "683d58d31ef9b06f0c9f1b8b107f3de6f921ed1932b4003eb6cf5ddf666c92e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "683d58d31ef9b06f0c9f1b8b107f3de6f921ed1932b4003eb6cf5ddf666c92e1", kill_on_drop: false }`
[INFO] [stdout] 683d58d31ef9b06f0c9f1b8b107f3de6f921ed1932b4003eb6cf5ddf666c92e1
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 078ba920ccbf6ec75989e782c77d45d8e8cfc0a55542cee68023940139cd0ebe
[INFO] running `Command { std: "docker" "start" "-a" "078ba920ccbf6ec75989e782c77d45d8e8cfc0a55542cee68023940139cd0ebe", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking futures-channel v0.3.30
[INFO] [stderr]    Compiling num-bigint v0.4.4
[INFO] [stderr]    Compiling num-rational v0.4.1
[INFO] [stderr]    Compiling proc-macro-utils v0.8.0
[INFO] [stderr]     Checking safecast v0.2.2
[INFO] [stderr]    Compiling derive-where v1.2.7
[INFO] [stderr]    Compiling async-stream-impl v0.3.5
[INFO] [stderr]    Compiling pin-project-internal v1.1.5
[INFO] [stderr]     Checking collate v0.4.1
[INFO] [stderr]     Checking num-integer v0.1.46
[INFO] [stderr]     Checking tokio v1.37.0
[INFO] [stderr]     Checking num-complex v0.4.5
[INFO] [stderr]     Checking get-size v0.1.4
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]     Checking num-iter v0.1.44
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking async-stream v0.3.5
[INFO] [stderr]     Checking pin-project v1.1.5
[INFO] [stderr]    Compiling quote-use-macros v0.7.2
[INFO] [stderr]     Checking tokio-stream v0.1.15
[INFO] [stderr]     Checking tokio-util v0.7.10
[INFO] [stderr]     Checking num v0.4.1
[INFO] [stderr]     Checking tokio-test v0.4.4
[INFO] [stderr]    Compiling quote-use v0.7.2
[INFO] [stderr]    Compiling attribute-derive-macro v0.6.1
[INFO] [stderr]     Checking futures-executor v0.3.30
[INFO] [stderr]     Checking futures v0.3.30
[INFO] [stderr]     Checking destream v0.7.3
[INFO] [stderr]    Compiling attribute-derive v0.6.1
[INFO] [stderr]    Compiling get-size-derive v0.1.3
[INFO] [stderr]     Checking number-general v0.11.1
[INFO] [stderr]     Checking destream_json v0.12.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `FromIterator` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     use std::iter::FromIterator;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `FromIterator` is already defined here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Error` is never constructed
[INFO] [stdout]   --> src/lib.rs:52:12
[INFO] [stdout]    |
[INFO] [stdout] 52 |     struct Error;
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.01s
[INFO] running `Command { std: "docker" "inspect" "078ba920ccbf6ec75989e782c77d45d8e8cfc0a55542cee68023940139cd0ebe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "078ba920ccbf6ec75989e782c77d45d8e8cfc0a55542cee68023940139cd0ebe", kill_on_drop: false }`
[INFO] [stdout] 078ba920ccbf6ec75989e782c77d45d8e8cfc0a55542cee68023940139cd0ebe