[INFO] fetching crate gaffer 0.2.0...
[INFO] checking gaffer-0.2.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate gaffer 0.2.0 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate gaffer 0.2.0 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 gaffer 0.2.0
[INFO] finished tweaking crates.io crate gaffer 0.2.0
[INFO] tweaked toml for crates.io crate gaffer 0.2.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate crates.io crate gaffer 0.2.0 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 proc-macro2 v1.0.30
[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] 19bf2ae06c0bf3f5e494d4acb61c93d55cda881d543b89ddd86dbdb3f78b22d1
[INFO] running `Command { std: "docker" "start" "-a" "19bf2ae06c0bf3f5e494d4acb61c93d55cda881d543b89ddd86dbdb3f78b22d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "19bf2ae06c0bf3f5e494d4acb61c93d55cda881d543b89ddd86dbdb3f78b22d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "19bf2ae06c0bf3f5e494d4acb61c93d55cda881d543b89ddd86dbdb3f78b22d1", kill_on_drop: false }`
[INFO] [stdout] 19bf2ae06c0bf3f5e494d4acb61c93d55cda881d543b89ddd86dbdb3f78b22d1
[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] 50ae733334b57ed61821ad7b1b7d8a142210d84e43b01f70999b371de5261736
[INFO] running `Command { std: "docker" "start" "-a" "50ae733334b57ed61821ad7b1b7d8a142210d84e43b01f70999b371de5261736", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.30
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling libc v0.2.105
[INFO] [stderr]    Compiling futures-core v0.3.17
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]    Compiling futures-task v0.3.17
[INFO] [stderr]    Compiling proc-macro-nested v0.1.7
[INFO] [stderr]    Compiling futures-channel v0.3.17
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling parking_lot_core v0.8.5
[INFO] [stderr]     Checking futures-sink v0.3.17
[INFO] [stderr]     Checking instant v0.1.12
[INFO] [stderr]     Checking pin-project-lite v0.2.7
[INFO] [stderr]     Checking smallvec v1.7.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking futures-io v0.3.17
[INFO] [stderr]     Checking slab v0.4.5
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking humantime v2.1.0
[INFO] [stderr]     Checking lock_api v0.4.5
[INFO] [stderr]     Checking termcolor v1.1.2
[INFO] [stderr]    Compiling futures-macro v0.3.17
[INFO] [stderr]    Compiling futures-util v0.3.17
[INFO] [stderr]     Checking crossbeam-channel v0.5.1
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking parking_lot v0.11.2
[INFO] [stderr]     Checking gaffer v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Iterator` is imported redundantly
[INFO] [stdout]  --> src/source.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     iter::Iterator,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Iterator` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `NeverRecur` is never used
[INFO] [stdout]    --> src/source.rs:186:6
[INFO] [stdout]     |
[INFO] [stdout] 186 | enum NeverRecur {}
[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]     Checking regex v1.5.4
[INFO] [stderr]     Checking env_logger v0.9.0
[INFO] [stderr]     Checking futures-executor v0.3.17
[INFO] [stderr]     Checking futures v0.3.17
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> examples/priority_throttle.rs:22:23
[INFO] [stdout]    |
[INFO] [stdout] 22 | struct PrioritisedJob(String, u8);
[INFO] [stdout]    |        -------------- ^^^^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PrioritisedJob` 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] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 22 | struct PrioritisedJob((), u8);
[INFO] [stdout]    |                       ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> examples/priority.rs:20:23
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct PrioritisedJob(String, u8);
[INFO] [stdout]    |        -------------- ^^^^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PrioritisedJob` 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] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct PrioritisedJob((), u8);
[INFO] [stdout]    |                       ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> examples/exclusion.rs:28:20
[INFO] [stdout]    |
[INFO] [stdout] 28 | struct ExcludedJob(String, ExclusionOption<u8>);
[INFO] [stdout]    |        ----------- ^^^^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ExcludedJob` 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] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 28 | struct ExcludedJob((), ExclusionOption<u8>);
[INFO] [stdout]    |                    ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Job` is imported redundantly
[INFO] [stdout]    --> src/runner.rs:337:58
[INFO] [stdout]     |
[INFO] [stdout] 337 |     use crate::{source::util::may_be_taken::VecSkipIter, Job, NoExclusion};
[INFO] [stdout]     |                                                          ^^^
[INFO] [stdout] 338 |
[INFO] [stdout] 339 |     use super::*;
[INFO] [stdout]     |         -------- the item `Job` is already imported here
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Iterator` is imported redundantly
[INFO] [stdout]  --> src/source.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     iter::Iterator,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Iterator` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `MergeResult` is imported redundantly
[INFO] [stdout]    --> src/source/util.rs:267:9
[INFO] [stdout]     |
[INFO] [stdout] 265 |     use super::*;
[INFO] [stdout]     |         -------- the item `MergeResult` is already imported here
[INFO] [stdout] 266 |
[INFO] [stdout] 267 |     use crate::MergeResult;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Duration` is imported redundantly
[INFO] [stdout]    --> src/source/util.rs:456:25
[INFO] [stdout]     |
[INFO] [stdout] 456 |         use std::time::{Duration, Instant};
[INFO] [stdout]     |                         ^^^^^^^^
[INFO] [stdout] 457 |
[INFO] [stdout] 458 |         use super::*;
[INFO] [stdout]     |             -------- the item `Duration` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Arc` is imported redundantly
[INFO] [stdout]    --> src/source.rs:205:16
[INFO] [stdout]     |
[INFO] [stdout] 205 |         sync::{Arc, Barrier},
[INFO] [stdout]     |                ^^^
[INFO] [stdout] ...
[INFO] [stdout] 212 |     use super::*;
[INFO] [stdout]     |         -------- the item `Arc` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Duration` is imported redundantly
[INFO] [stdout]    --> src/source.rs:207:9
[INFO] [stdout]     |
[INFO] [stdout] 207 |         time::Duration,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 212 |     use super::*;
[INFO] [stdout]     |         -------- the item `Duration` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Prioritised` is imported redundantly
[INFO] [stdout]    --> src/source.rs:210:9
[INFO] [stdout]     |
[INFO] [stdout] 210 |     use crate::Prioritised;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 211 |
[INFO] [stdout] 212 |     use super::*;
[INFO] [stdout]     |         -------- the item `Prioritised` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.99s
[INFO] running `Command { std: "docker" "inspect" "50ae733334b57ed61821ad7b1b7d8a142210d84e43b01f70999b371de5261736", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "50ae733334b57ed61821ad7b1b7d8a142210d84e43b01f70999b371de5261736", kill_on_drop: false }`
[INFO] [stdout] 50ae733334b57ed61821ad7b1b7d8a142210d84e43b01f70999b371de5261736