[INFO] cloning repository https://github.com/xoac/u8-selector
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/xoac/u8-selector" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxoac%2Fu8-selector", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxoac%2Fu8-selector'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 75b9870d863afe15d3cd7f39105884323b2c15f3
[INFO] checking xoac/u8-selector against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxoac%2Fu8-selector" "/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/xoac/u8-selector 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/xoac/u8-selector
[INFO] finished tweaking git repo https://github.com/xoac/u8-selector
[INFO] tweaked toml for git repo https://github.com/xoac/u8-selector written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/xoac/u8-selector 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded bytes v0.4.8
[INFO] [stderr]   Downloaded mach v0.0.5
[INFO] [stderr]   Downloaded tokio-fs v0.1.1
[INFO] [stderr]   Downloaded pretty_env_logger v0.2.3
[INFO] [stderr]   Downloaded tokio-tcp v0.1.0
[INFO] [stderr]   Downloaded miow v0.3.1
[INFO] [stderr]   Downloaded tokio-timer v0.2.4
[INFO] [stderr]   Downloaded mio-serial v0.8.0
[INFO] [stderr]   Downloaded tokio-threadpool v0.1.4
[INFO] [stderr]   Downloaded socket2 v0.3.6
[INFO] [stderr]   Downloaded serialport v2.3.0
[INFO] [stderr]   Downloaded mio v0.6.14
[INFO] [stderr]   Downloaded futures v0.1.21
[INFO] [stderr]   Downloaded tokio-executor v0.1.2
[INFO] [stderr]   Downloaded tokio-reactor v0.1.2
[INFO] [stderr]   Downloaded tokio-serial v0.8.0
[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] 36e157b9f66515178a53df6bd9c5b54adcd0ddce52c036240eef2152bb4f276a
[INFO] running `Command { std: "docker" "start" "-a" "36e157b9f66515178a53df6bd9c5b54adcd0ddce52c036240eef2152bb4f276a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "36e157b9f66515178a53df6bd9c5b54adcd0ddce52c036240eef2152bb4f276a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "36e157b9f66515178a53df6bd9c5b54adcd0ddce52c036240eef2152bb4f276a", kill_on_drop: false }`
[INFO] [stdout] 36e157b9f66515178a53df6bd9c5b54adcd0ddce52c036240eef2152bb4f276a
[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] efada8ebad83d992a71599163858d10c5617926a0237d8e36fedc67bdb271d57
[INFO] running `Command { std: "docker" "start" "-a" "efada8ebad83d992a71599163858d10c5617926a0237d8e36fedc67bdb271d57", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.42
[INFO] [stderr]     Checking cfg-if v0.1.3
[INFO] [stderr]     Checking byteorder v1.2.3
[INFO] [stderr]     Checking futures v0.1.21
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking lazy_static v1.0.1
[INFO] [stderr]     Checking lazycell v0.6.0
[INFO] [stderr]     Checking slab v0.4.0
[INFO] [stderr]    Compiling pkg-config v0.3.11
[INFO] [stderr]     Checking nodrop v0.1.12
[INFO] [stderr]     Checking memoffset v0.2.1
[INFO] [stderr]     Checking scopeguard v0.3.3
[INFO] [stderr]    Compiling nix v0.10.0
[INFO] [stderr]     Checking bitflags v1.0.3
[INFO] [stderr]     Checking ucd-util v0.1.1
[INFO] [stderr]    Compiling regex v1.0.0
[INFO] [stderr]     Checking bitflags v0.9.1
[INFO] [stderr]     Checking log v0.4.2
[INFO] [stderr]     Checking crossbeam-utils v0.3.2
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]     Checking quick-error v1.2.2
[INFO] [stderr]     Checking utf8-ranges v1.0.0
[INFO] [stderr]     Checking termcolor v0.3.6
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking arrayvec v0.4.7
[INFO] [stderr]     Checking thread_local v0.3.5
[INFO] [stderr]     Checking humantime v1.1.1
[INFO] [stderr]     Checking regex-syntax v0.6.1
[INFO] [stderr]    Compiling libudev-sys v0.1.4
[INFO] [stderr]     Checking crossbeam-epoch v0.4.3
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking net2 v0.2.32
[INFO] [stderr]     Checking rand v0.4.2
[INFO] [stderr]     Checking num_cpus v1.8.0
[INFO] [stderr]     Checking memchr v2.0.1
[INFO] [stderr]     Checking atty v0.2.10
[INFO] [stderr]     Checking bytes v0.4.8
[INFO] [stderr]     Checking crossbeam-deque v0.3.1
[INFO] [stderr]     Checking aho-corasick v0.6.4
[INFO] [stderr]     Checking mio v0.6.14
[INFO] [stderr]     Checking tokio-executor v0.1.2
[INFO] [stderr]     Checking tokio-io v0.1.7
[INFO] [stderr]     Checking tokio-threadpool v0.1.4
[INFO] [stderr]     Checking tokio-timer v0.2.4
[INFO] [stderr]     Checking libudev v0.2.0
[INFO] [stderr]     Checking tokio-reactor v0.1.2
[INFO] [stderr]     Checking tokio-codec v0.1.0
[INFO] [stderr]     Checking tokio-fs v0.1.1
[INFO] [stderr]     Checking tokio-udp v0.1.1
[INFO] [stderr]     Checking tokio-tcp v0.1.0
[INFO] [stderr]     Checking tokio v0.1.7
[INFO] [stderr]     Checking env_logger v0.5.10
[INFO] [stderr]     Checking serialport v2.3.0
[INFO] [stderr]     Checking pretty_env_logger v0.2.3
[INFO] [stderr]     Checking mio-serial v0.8.0
[INFO] [stderr]     Checking tokio-serial v0.8.0
[INFO] [stderr]     Checking u8-selector v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]   --> src/lib.rs:42:44
[INFO] [stdout]    |
[INFO] [stdout] 42 |             let n = try_ready!(self.socket.read_buf(&mut self.rd));
[INFO] [stdout]    |                                            ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: once this associated item is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]    = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]    = help: call with fully qualified syntax `tokio::io::AsyncRead::read_buf(...)` to keep using the current method
[INFO] [stdout]    = note: `#[warn(unstable_name_collisions)]` on by default
[INFO] [stdout] help: add `#![feature(read_buf)]` to the crate attributes to enable `std::io::Read::read_buf`
[INFO] [stdout]    |
[INFO] [stdout] 1  + #![feature(read_buf)]
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]   --> src/lib.rs:42:44
[INFO] [stdout]    |
[INFO] [stdout] 42 |             let n = try_ready!(self.socket.read_buf(&mut self.rd));
[INFO] [stdout]    |                                            ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: once this associated item is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]    = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]    = help: call with fully qualified syntax `tokio::io::AsyncRead::read_buf(...)` to keep using the current method
[INFO] [stdout]    = note: `#[warn(unstable_name_collisions)]` on by default
[INFO] [stdout] help: add `#![feature(read_buf)]` to the crate attributes to enable `std::io::Read::read_buf`
[INFO] [stdout]    |
[INFO] [stdout] 1  + #![feature(read_buf)]
[INFO] [stdout]    |
[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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.39s
[INFO] running `Command { std: "docker" "inspect" "efada8ebad83d992a71599163858d10c5617926a0237d8e36fedc67bdb271d57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "efada8ebad83d992a71599163858d10c5617926a0237d8e36fedc67bdb271d57", kill_on_drop: false }`
[INFO] [stdout] efada8ebad83d992a71599163858d10c5617926a0237d8e36fedc67bdb271d57