[INFO] cloning repository https://github.com/ThomWright/tit
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ThomWright/tit" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FThomWright%2Ftit", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FThomWright%2Ftit'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5f1743917eb569bdf3e865bfc811af72e933a5ce
[INFO] checking ThomWright/tit against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FThomWright%2Ftit" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ThomWright/tit 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/ThomWright/tit
[INFO] finished tweaking git repo https://github.com/ThomWright/tit
[INFO] tweaked toml for git repo https://github.com/ThomWright/tit written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/ThomWright/tit 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]  Downloading crates ...
[INFO] [stderr]   Downloaded net2 v0.2.36
[INFO] [stderr]   Downloaded arraydeque v0.4.5
[INFO] [stderr]   Downloaded cc v1.0.65
[INFO] [stderr]   Downloaded futures v0.1.30
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 8bc146a068c09d701f00e88e188b5f04fe4bbf68d6396f83346c8ac3490aa0ab
[INFO] running `Command { std: "docker" "start" "-a" "8bc146a068c09d701f00e88e188b5f04fe4bbf68d6396f83346c8ac3490aa0ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8bc146a068c09d701f00e88e188b5f04fe4bbf68d6396f83346c8ac3490aa0ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8bc146a068c09d701f00e88e188b5f04fe4bbf68d6396f83346c8ac3490aa0ab", kill_on_drop: false }`
[INFO] [stdout] 8bc146a068c09d701f00e88e188b5f04fe4bbf68d6396f83346c8ac3490aa0ab
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 6fe44e60fa1912dc4bfcc8aaab30d13947d9d4a3c808637f459a5d493140d607
[INFO] running `Command { std: "docker" "start" "-a" "6fe44e60fa1912dc4bfcc8aaab30d13947d9d4a3c808637f459a5d493140d607", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.80
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]     Checking futures v0.1.30
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling crossbeam-utils v0.8.1
[INFO] [stderr]    Compiling cc v1.0.65
[INFO] [stderr]     Checking scoped-tls v0.1.2
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]    Compiling arraydeque v0.4.5
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]     Checking smallvec v0.6.13
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]     Checking crossbeam-channel v0.5.0
[INFO] [stderr]     Checking etherparse v0.9.0
[INFO] [stderr]     Checking crossbeam-queue v0.2.3
[INFO] [stderr]    Compiling tun-tap v0.1.2
[INFO] [stderr]     Checking crossbeam-deque v0.7.3
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking net2 v0.2.36
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking tokio-executor v0.1.10
[INFO] [stderr]     Checking tokio-sync v0.1.8
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]     Checking tokio-threadpool v0.1.18
[INFO] [stderr]     Checking tokio-current-thread v0.1.7
[INFO] [stderr]     Checking tokio-timer v0.2.13
[INFO] [stderr]     Checking tokio-io v0.1.13
[INFO] [stderr]     Checking tokio-codec v0.1.2
[INFO] [stderr]     Checking tokio-fs v0.1.7
[INFO] [stderr]     Checking tokio-reactor v0.1.12
[INFO] [stderr]     Checking mio-uds v0.6.8
[INFO] [stderr]     Checking tokio-udp v0.1.6
[INFO] [stderr]     Checking tokio-uds v0.2.7
[INFO] [stderr]     Checking tokio-tcp v0.1.4
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stderr]     Checking tokio-core v0.1.17
[INFO] [stderr]     Checking tit v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `crossbeam_channel` is imported redundantly
[INFO] [stdout]  --> src/errors.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crossbeam_channel;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^ the item `crossbeam_channel` 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 `crossbeam_channel` is imported redundantly
[INFO] [stdout]  --> src/nic.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crossbeam_channel;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^ the item `crossbeam_channel` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `etherparse` is imported redundantly
[INFO] [stdout]  --> src/nic.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use etherparse;
[INFO] [stdout]   |     ^^^^^^^^^^ the item `etherparse` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `tun_tap` is imported redundantly
[INFO] [stdout]  --> src/nic.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use tun_tap;
[INFO] [stdout]   |     ^^^^^^^ the item `tun_tap` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `etherparse` is imported redundantly
[INFO] [stdout]  --> src/print.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use etherparse;
[INFO] [stdout]   |     ^^^^^^^^^^ the item `etherparse` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `crossbeam_channel` is imported redundantly
[INFO] [stdout]  --> src/tcp/interfaces.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crossbeam_channel;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^ the item `crossbeam_channel` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `crossbeam_channel` is imported redundantly
[INFO] [stdout]  --> src/tcp/tcp.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crossbeam_channel;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^ the item `crossbeam_channel` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `crossbeam_channel` is imported redundantly
[INFO] [stdout]  --> src/errors.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crossbeam_channel;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^ the item `crossbeam_channel` 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 `crossbeam_channel` is imported redundantly
[INFO] [stdout]  --> src/nic.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crossbeam_channel;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^ the item `crossbeam_channel` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `etherparse` is imported redundantly
[INFO] [stdout]  --> src/nic.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use etherparse;
[INFO] [stdout]   |     ^^^^^^^^^^ the item `etherparse` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `tun_tap` is imported redundantly
[INFO] [stdout]  --> src/nic.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use tun_tap;
[INFO] [stdout]   |     ^^^^^^^ the item `tun_tap` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `etherparse` is imported redundantly
[INFO] [stdout]  --> src/print.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use etherparse;
[INFO] [stdout]   |     ^^^^^^^^^^ the item `etherparse` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `crossbeam_channel` is imported redundantly
[INFO] [stdout]  --> src/tcp/interfaces.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crossbeam_channel;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^ the item `crossbeam_channel` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `IpHeader` is imported redundantly
[INFO] [stdout]    --> src/tcp/tcp.rs:412:9
[INFO] [stdout]     |
[INFO] [stdout] 410 |     use super::*;
[INFO] [stdout]     |         -------- the item `IpHeader` is already imported here
[INFO] [stdout] 411 |     use etherparse::{
[INFO] [stdout] 412 |         IpHeader, IpTrafficClass, Ipv4Header, PacketHeaders, SerializedSize,
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TcpHeader` is imported redundantly
[INFO] [stdout]    --> src/tcp/tcp.rs:413:9
[INFO] [stdout]     |
[INFO] [stdout] 410 |     use super::*;
[INFO] [stdout]     |         -------- the item `TcpHeader` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 413 |         TcpHeader, TCP_MINIMUM_HEADER_SIZE,
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/errors.rs:33:25
[INFO] [stdout]    |
[INFO] [stdout] 33 | pub struct TcpSendError(crossbeam_channel::SendError<tcp::TcpPacket>);
[INFO] [stdout]    |            ------------ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TcpSendError` 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] 33 | pub struct TcpSendError(());
[INFO] [stdout]    |                         ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Active` is never constructed
[INFO] [stdout]   --> src/tcp/connection.rs:99:5
[INFO] [stdout]    |
[INFO] [stdout] 97 | enum OpenType {
[INFO] [stdout]    |      -------- variant in this enum
[INFO] [stdout] 98 |     Passive,
[INFO] [stdout] 99 |     Active,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `OpenType` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/errors.rs:33:25
[INFO] [stdout]    |
[INFO] [stdout] 33 | pub struct TcpSendError(crossbeam_channel::SendError<tcp::TcpPacket>);
[INFO] [stdout]    |            ------------ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TcpSendError` 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] 33 | pub struct TcpSendError(());
[INFO] [stdout]    |                         ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Active` is never constructed
[INFO] [stdout]   --> src/tcp/connection.rs:99:5
[INFO] [stdout]    |
[INFO] [stdout] 97 | enum OpenType {
[INFO] [stdout]    |      -------- variant in this enum
[INFO] [stdout] 98 |     Passive,
[INFO] [stdout] 99 |     Active,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `OpenType` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.59s
[INFO] running `Command { std: "docker" "inspect" "6fe44e60fa1912dc4bfcc8aaab30d13947d9d4a3c808637f459a5d493140d607", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6fe44e60fa1912dc4bfcc8aaab30d13947d9d4a3c808637f459a5d493140d607", kill_on_drop: false }`
[INFO] [stdout] 6fe44e60fa1912dc4bfcc8aaab30d13947d9d4a3c808637f459a5d493140d607