[INFO] cloning repository https://github.com/su225/rust-async-workshop
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/su225/rust-async-workshop" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsu225%2Frust-async-workshop", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsu225%2Frust-async-workshop'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 98843146cd4a28b4418443c22b83e9f3beaca8c0
[INFO] checking su225/rust-async-workshop against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsu225%2Frust-async-workshop" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] removed /workspace/builds/worker-3-tc2/source/.cargo/config
[INFO] removed /workspace/builds/worker-3-tc2/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/su225/rust-async-workshop
[INFO] finished tweaking git repo https://github.com/su225/rust-async-workshop
[INFO] tweaked toml for git repo https://github.com/su225/rust-async-workshop written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/su225/rust-async-workshop on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/su225/rust-async-workshop 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6e9d78536f59ab074639f4b85755c01e3c76343ca824011ca4545d546095f783
[INFO] running `Command { std: "docker" "start" "-a" "6e9d78536f59ab074639f4b85755c01e3c76343ca824011ca4545d546095f783", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6e9d78536f59ab074639f4b85755c01e3c76343ca824011ca4545d546095f783", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6e9d78536f59ab074639f4b85755c01e3c76343ca824011ca4545d546095f783", kill_on_drop: false }`
[INFO] [stdout] 6e9d78536f59ab074639f4b85755c01e3c76343ca824011ca4545d546095f783
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6eb6b87f40f707f28b01b8ad82c0e6d9fa8c724a48c7e5c0812e87d923dbd491
[INFO] running `Command { std: "docker" "start" "-a" "6eb6b87f40f707f28b01b8ad82c0e6d9fa8c724a48c7e5c0812e87d923dbd491", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]    Compiling autocfg v0.1.6
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.3
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling memoffset v0.5.1
[INFO] [stderr]     Checking smallvec v0.6.10
[INFO] [stderr]     Checking log v0.4.8
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling arrayvec v0.4.11
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.18
[INFO] [stderr]     Checking nodrop v0.1.13
[INFO] [stderr]     Checking pin-utils v0.1.0-alpha.4
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.18
[INFO] [stderr]     Checking futures-io-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking crossbeam-queue v0.1.2
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.18
[INFO] [stderr]     Checking tracing-core v0.1.6
[INFO] [stderr]    Compiling pin-project-internal v0.4.0-alpha.11
[INFO] [stderr]     Checking tokio-executor v0.1.8
[INFO] [stderr]     Checking crossbeam-epoch v0.7.2
[INFO] [stderr]     Checking stable_deref_trait v1.1.1
[INFO] [stderr]     Checking owning_ref v0.4.0
[INFO] [stderr]    Compiling parking_lot_core v0.4.0
[INFO] [stderr]     Checking crossbeam-channel v0.3.9
[INFO] [stderr]     Checking scopeguard v0.3.3
[INFO] [stderr]     Checking tokio-sync v0.1.6
[INFO] [stderr]     Checking lock_api v0.3.1
[INFO] [stderr]     Checking lock_api v0.1.5
[INFO] [stderr]     Checking crossbeam-deque v0.7.1
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking num_cpus v1.10.1
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking parking_lot_core v0.6.2
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]     Checking mio v0.6.19
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]     Checking parking_lot v0.9.0
[INFO] [stderr]     Checking tokio-io v0.1.12
[INFO] [stderr]     Checking unicode-width v0.1.6
[INFO] [stderr]    Compiling unicode-segmentation v1.3.0
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking atty v0.2.13
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]     Checking regex-syntax v0.6.12
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking tokio-codec v0.1.1
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking utf8-ranges v1.0.4
[INFO] [stderr]     Checking time v0.1.42
[INFO] [stderr]     Checking tokio-threadpool v0.1.15
[INFO] [stderr]     Checking tokio-timer v0.2.11
[INFO] [stderr]     Checking parking_lot v0.7.1
[INFO] [stderr]     Checking tokio-reactor v0.1.9
[INFO] [stderr]     Checking tokio-current-thread v0.1.6
[INFO] [stderr]     Checking tokio-fs v0.1.6
[INFO] [stderr]     Checking tokio-sync v0.2.0-alpha.5
[INFO] [stderr]     Checking futures-executor-preview v0.3.0-alpha.18
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking futures-preview v0.3.0-alpha.18
[INFO] [stderr]     Checking tokio-tcp v0.1.3
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[INFO] [stderr]     Checking matchers v0.0.1
[INFO] [stderr]     Checking tracing-subscriber v0.1.3
[INFO] [stderr]    Compiling proc-macro-error v0.2.6
[INFO] [stderr]    Compiling tracing-attributes v0.1.3
[INFO] [stderr]    Compiling tokio-macros v0.2.0-alpha.5
[INFO] [stderr]    Compiling structopt-derive v0.3.2
[INFO] [stderr]     Checking tracing v0.1.9
[INFO] [stderr]     Checking tokio-executor v0.2.0-alpha.5
[INFO] [stderr]     Checking structopt v0.3.2
[INFO] [stderr]     Checking pin-project v0.4.0-alpha.11
[INFO] [stderr]     Checking tokio-io v0.2.0-alpha.5
[INFO] [stderr]     Checking tokio-codec v0.2.0-alpha.5
[INFO] [stderr]     Checking tokio-net v0.2.0-alpha.5
[INFO] [stderr]     Checking tokio-timer v0.3.0-alpha.5
[INFO] [stderr]     Checking tokio-fs v0.2.0-alpha.5
[INFO] [stderr]     Checking tokio v0.2.0-alpha.5
[INFO] [stderr]     Checking tracing-futures v0.0.1-alpha.2 (https://github.com/tokio-rs/tracing?rev=9f1126a00d105ff85f5b65fc6457699430b1bed4#9f1126a0)
[INFO] [stderr]     Checking client v0.0.0 (/opt/rustwide/workdir/client)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> client/src/../solutions/client.rs:10:39
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub async fn run_client(user: String, mut stream: TcpStream) -> Result<(), Error> {
[INFO] [stdout]    |                                       ----^^^^^^
[INFO] [stdout]    |                                       |
[INFO] [stdout]    |                                       help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking server v0.0.0 (/opt/rustwide/workdir/server)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> client/src/../solutions/client.rs:10:39
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub async fn run_client(user: String, mut stream: TcpStream) -> Result<(), Error> {
[INFO] [stdout]    |                                       ----^^^^^^
[INFO] [stdout]    |                                       |
[INFO] [stdout]    |                                       help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> client/src/main.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | /     /// The username to connect as.
[INFO] [stdout] 18 | |     #[structopt()]
[INFO] [stdout] 19 | |     user: String,
[INFO] [stdout]    | |________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `client` (bin "client") due to 1 previous error; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> client/src/main.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | /     /// The username to connect as.
[INFO] [stdout] 18 | |     #[structopt()]
[INFO] [stdout] 19 | |     user: String,
[INFO] [stdout]    | |________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `client` (bin "client" test) due to 1 previous error; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "6eb6b87f40f707f28b01b8ad82c0e6d9fa8c724a48c7e5c0812e87d923dbd491", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6eb6b87f40f707f28b01b8ad82c0e6d9fa8c724a48c7e5c0812e87d923dbd491", kill_on_drop: false }`
[INFO] [stdout] 6eb6b87f40f707f28b01b8ad82c0e6d9fa8c724a48c7e5c0812e87d923dbd491
