[INFO] fetching crate vmm-sys-util 0.11.2...
[INFO] checking vmm-sys-util-0.11.2 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate vmm-sys-util 0.11.2 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate vmm-sys-util 0.11.2 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] removed /workspace/builds/worker-2-tc1/source/.cargo/config
[INFO] started tweaking crates.io crate vmm-sys-util 0.11.2
[INFO] finished tweaking crates.io crate vmm-sys-util 0.11.2
[INFO] tweaked toml for crates.io crate vmm-sys-util 0.11.2 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
[INFO] [stderr]      Locking 12 packages
[INFO] [stderr]       Adding bitflags v1.3.2 (latest: v2.5.0)
[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] 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] f62c7ffa429dcf4c9fd98a0c01fc9b23e7cc747752dbf8a2c30c0c6d2ae0f243
[INFO] running `Command { std: "docker" "start" "-a" "f62c7ffa429dcf4c9fd98a0c01fc9b23e7cc747752dbf8a2c30c0c6d2ae0f243", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f62c7ffa429dcf4c9fd98a0c01fc9b23e7cc747752dbf8a2c30c0c6d2ae0f243", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f62c7ffa429dcf4c9fd98a0c01fc9b23e7cc747752dbf8a2c30c0c6d2ae0f243", kill_on_drop: false }`
[INFO] [stdout] f62c7ffa429dcf4c9fd98a0c01fc9b23e7cc747752dbf8a2c30c0c6d2ae0f243
[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] 6f9a79fd558168b3b1e70217ad571775786fd064323a06129bc2c79ec048f678
[INFO] running `Command { std: "docker" "start" "-a" "6f9a79fd558168b3b1e70217ad571775786fd064323a06129bc2c79ec048f678", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.197
[INFO] [stderr]     Checking vmm-sys-util v0.11.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Drop` is imported redundantly
[INFO] [stdout]  --> src/linux/epoll.rs:8:23
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::ops::{Deref, Drop};
[INFO] [stdout]   |                       ^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Drop` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]   --> src/linux/timerfd.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | use libc::{self, timerfd_create, timerfd_gettime, timerfd_settime, CLOCK_MONOTONIC, TFD_CLOEXEC};
[INFO] [stdout]    |            ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]   --> src/tempfile.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | use libc;
[INFO] [stdout]    |     ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking serde_json v1.0.115
[INFO] [stdout] warning: the item `Drop` is imported redundantly
[INFO] [stdout]  --> src/linux/epoll.rs:8:23
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::ops::{Deref, Drop};
[INFO] [stdout]   |                       ^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `Drop` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `File` is imported redundantly
[INFO] [stdout]   --> src/linux/seek_hole.rs:82:9
[INFO] [stdout]    |
[INFO] [stdout] 80 |     use super::*;
[INFO] [stdout]    |         -------- the item `File` is already imported here
[INFO] [stdout] 81 |     use crate::tempdir::TempDir;
[INFO] [stdout] 82 |     use std::fs::File;
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `size_of` is imported redundantly
[INFO] [stdout]    --> src/linux/sock_ctrl_msg.rs:468:9
[INFO] [stdout]     |
[INFO] [stdout] 464 |     use super::*;
[INFO] [stdout]     |         -------- the item `size_of` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 468 |     use std::mem::size_of;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `UnixDatagram` is imported redundantly
[INFO] [stdout]    --> src/linux/sock_ctrl_msg.rs:470:9
[INFO] [stdout]     |
[INFO] [stdout] 464 |     use super::*;
[INFO] [stdout]     |         -------- the item `UnixDatagram` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 470 |     use std::os::unix::net::UnixDatagram;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `cmsghdr` is imported redundantly
[INFO] [stdout]    --> src/linux/sock_ctrl_msg.rs:473:9
[INFO] [stdout]     |
[INFO] [stdout] 464 |     use super::*;
[INFO] [stdout]     |         -------- the item `cmsghdr` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 473 |     use libc::cmsghdr;
[INFO] [stdout]     |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]   --> src/linux/timerfd.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | use libc::{self, timerfd_create, timerfd_gettime, timerfd_settime, CLOCK_MONOTONIC, TFD_CLOEXEC};
[INFO] [stdout]    |            ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Duration` is imported redundantly
[INFO] [stdout]    --> src/linux/timerfd.rs:233:21
[INFO] [stdout]     |
[INFO] [stdout] 231 |     use super::*;
[INFO] [stdout]     |         -------- the item `Duration` is already imported here
[INFO] [stdout] 232 |     use std::thread::sleep;
[INFO] [stdout] 233 |     use std::time::{Duration, Instant};
[INFO] [stdout]     |                     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Seek` is imported redundantly
[INFO] [stdout]    --> src/linux/write_zeroes.rs:155:25
[INFO] [stdout]     |
[INFO] [stdout] 153 |     use super::*;
[INFO] [stdout]     |         -------- the item `Seek` is already imported here
[INFO] [stdout] 154 |
[INFO] [stdout] 155 |     use std::io::{Read, Seek, SeekFrom, Write};
[INFO] [stdout]     |                         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `SeekFrom` is imported redundantly
[INFO] [stdout]    --> src/linux/write_zeroes.rs:155:31
[INFO] [stdout]     |
[INFO] [stdout] 153 |     use super::*;
[INFO] [stdout]     |         -------- the item `SeekFrom` is already imported here
[INFO] [stdout] 154 |
[INFO] [stdout] 155 |     use std::io::{Read, Seek, SeekFrom, Write};
[INFO] [stdout]     |                               ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `io` is imported redundantly
[INFO] [stdout]    --> src/errno.rs:138:19
[INFO] [stdout]     |
[INFO] [stdout] 134 |     use super::*;
[INFO] [stdout]     |         -------- the item `io` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 138 |     use std::io::{self, Read};
[INFO] [stdout]     |                   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]   --> src/tempfile.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | use libc;
[INFO] [stdout]    |     ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.90s
[INFO] running `Command { std: "docker" "inspect" "6f9a79fd558168b3b1e70217ad571775786fd064323a06129bc2c79ec048f678", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6f9a79fd558168b3b1e70217ad571775786fd064323a06129bc2c79ec048f678", kill_on_drop: false }`
[INFO] [stdout] 6f9a79fd558168b3b1e70217ad571775786fd064323a06129bc2c79ec048f678