[INFO] cloning repository https://github.com/fEyebrow/chat [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/fEyebrow/chat" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FfEyebrow%2Fchat", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FfEyebrow%2Fchat'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 0d1ad7d5fa3ce4ef3517e0e389e2b4689f9684e5 [INFO] testing fEyebrow/chat against beta-2022-04-10 for beta-1.61-1 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FfEyebrow%2Fchat" "/workspace/builds/worker-111/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-111/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/fEyebrow/chat on toolchain beta-2022-04-10 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/fEyebrow/chat [INFO] removed 0 missing examples [INFO] finished tweaking git repo https://github.com/fEyebrow/chat [INFO] tweaked toml for git repo https://github.com/fEyebrow/chat written to /workspace/builds/worker-111/source/Cargo.toml [INFO] crate git repo https://github.com/fEyebrow/chat already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-111/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-111/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 5e463c8129e4579c5198cc8cb70f3cba2ffd97c1c35e4617faba2a1ff243e729 [INFO] running `Command { std: "docker" "start" "-a" "5e463c8129e4579c5198cc8cb70f3cba2ffd97c1c35e4617faba2a1ff243e729", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "5e463c8129e4579c5198cc8cb70f3cba2ffd97c1c35e4617faba2a1ff243e729", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "5e463c8129e4579c5198cc8cb70f3cba2ffd97c1c35e4617faba2a1ff243e729", kill_on_drop: false }` [INFO] [stdout] 5e463c8129e4579c5198cc8cb70f3cba2ffd97c1c35e4617faba2a1ff243e729 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-111/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-111/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 89267af5d38e76c2f6a857037a4e290120f00e4c63522030ff7857268fad501d [INFO] running `Command { std: "docker" "start" "-a" "89267af5d38e76c2f6a857037a4e290120f00e4c63522030ff7857268fad501d", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Compiling libc v0.2.98 [INFO] [stderr] Compiling proc-macro2 v1.0.28 [INFO] [stderr] Compiling syn v1.0.74 [INFO] [stderr] Compiling once_cell v1.8.0 [INFO] [stderr] Compiling log v0.4.14 [INFO] [stderr] Compiling cc v1.0.69 [INFO] [stderr] Compiling pin-project-lite v0.2.7 [INFO] [stderr] Compiling memchr v2.4.0 [INFO] [stderr] Compiling futures-core v0.3.16 [INFO] [stderr] Compiling smallvec v1.6.1 [INFO] [stderr] Compiling typenum v1.13.0 [INFO] [stderr] Compiling version_check v0.9.3 [INFO] [stderr] Compiling bytes v1.0.1 [INFO] [stderr] Compiling futures-task v0.3.16 [INFO] [stderr] Compiling proc-macro-nested v0.1.7 [INFO] [stderr] Compiling futures-sink v0.3.16 [INFO] [stderr] Compiling futures-channel v0.3.16 [INFO] [stderr] Compiling slab v0.4.3 [INFO] [stderr] Compiling itoa v0.4.7 [INFO] [stderr] Compiling serde v1.0.126 [INFO] [stderr] Compiling futures-io v0.3.16 [INFO] [stderr] Compiling httparse v1.4.1 [INFO] [stderr] Compiling serde_json v1.0.64 [INFO] [stderr] Compiling openssl-probe v0.1.4 [INFO] [stderr] Compiling cpufeatures v0.1.5 [INFO] [stderr] Compiling unicode-segmentation v1.8.0 [INFO] [stderr] Compiling byteorder v1.4.3 [INFO] [stderr] Compiling argh_shared v0.1.5 [INFO] [stderr] Compiling utf-8 v0.7.6 [INFO] [stderr] Compiling instant v0.1.10 [INFO] [stderr] Compiling proc-macro-hack v0.5.19 [INFO] [stderr] Compiling futures-macro v0.3.16 [INFO] [stderr] Compiling lock_api v0.4.4 [INFO] [stderr] Compiling tokio v1.9.0 [INFO] [stderr] Compiling tinyvec v1.3.1 [INFO] [stderr] Compiling num-traits v0.2.14 [INFO] [stderr] Compiling futures-util v0.3.16 [INFO] [stderr] Compiling num-integer v0.1.44 [INFO] [stderr] Compiling unicode-bidi v0.3.5 [INFO] [stderr] Compiling tracing-core v0.1.18 [INFO] [stderr] Compiling ryu v1.0.5 [INFO] [stderr] Compiling form_urlencoded v1.0.1 [INFO] [stderr] Compiling regex-automata v0.1.10 [INFO] [stderr] Compiling sharded-slab v0.1.1 [INFO] [stderr] Compiling regex v1.5.4 [INFO] [stderr] Compiling thread_local v1.1.3 [INFO] [stderr] Compiling heck v0.3.3 [INFO] [stderr] Compiling ring v0.16.20 [INFO] [stderr] Compiling generic-array v0.14.4 [INFO] [stderr] Compiling http v0.2.4 [INFO] [stderr] Compiling matchers v0.0.1 [INFO] [stderr] Compiling unicode-normalization v0.1.19 [INFO] [stderr] Compiling tracing-log v0.1.2 [INFO] [stderr] Compiling num_cpus v1.13.0 [INFO] [stderr] Compiling parking_lot_core v0.8.3 [INFO] [stderr] Compiling signal-hook-registry v1.4.0 [INFO] [stderr] Compiling getrandom v0.2.3 [INFO] [stderr] Compiling mio v0.7.13 [INFO] [stderr] Compiling quote v1.0.9 [INFO] [stderr] Compiling rand_core v0.6.3 [INFO] [stderr] Compiling dashmap v4.0.2 [INFO] [stderr] Compiling tracing-serde v0.1.2 [INFO] [stderr] Compiling idna v0.2.3 [INFO] [stderr] Compiling parking_lot v0.11.1 [INFO] [stderr] Compiling rand_chacha v0.3.1 [INFO] [stderr] Compiling webpki v0.21.4 [INFO] [stderr] Compiling sct v0.6.1 [INFO] [stderr] Compiling chrono v0.4.19 [INFO] [stderr] Compiling digest v0.9.0 [INFO] [stderr] Compiling block-buffer v0.9.0 [INFO] [stderr] Compiling url v2.2.2 [INFO] [stderr] Compiling sha-1 v0.9.7 [INFO] [stderr] Compiling rand v0.8.4 [INFO] [stderr] Compiling rustls v0.19.1 [INFO] [stderr] Compiling webpki-roots v0.21.1 [INFO] [stderr] Compiling rustls-native-certs v0.5.0 [INFO] [stderr] Compiling tokio-macros v1.3.0 [INFO] [stderr] Compiling thiserror-impl v1.0.26 [INFO] [stderr] Compiling tracing-attributes v0.1.15 [INFO] [stderr] Compiling pin-project-internal v1.0.8 [INFO] [stderr] Compiling argh_derive v0.1.5 [INFO] [stderr] Compiling thiserror v1.0.26 [INFO] [stderr] Compiling pin-project v1.0.8 [INFO] [stderr] Compiling argh v0.1.5 [INFO] [stderr] Compiling tracing v0.1.26 [INFO] [stderr] Compiling tungstenite v0.14.0 [INFO] [stderr] Compiling tracing-subscriber v0.2.19 [INFO] [stderr] Compiling futures-executor v0.3.16 [INFO] [stderr] Compiling futures v0.3.16 [INFO] [stderr] Compiling tokio-rustls v0.22.0 [INFO] [stderr] Compiling tokio-util v0.6.7 [INFO] [stderr] Compiling tokio-stream v0.1.7 [INFO] [stderr] Compiling tokio-tungstenite v0.15.0 [INFO] [stderr] Compiling chat v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/lib.rs:111:9 [INFO] [stdout] | [INFO] [stdout] 111 | let mut stream = acceptor.accept(stream).await?; [INFO] [stdout] | ----^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::io::prelude` [INFO] [stdout] --> src/lib.rs:8:5 [INFO] [stdout] | [INFO] [stdout] 8 | use std::io::prelude::*; [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 2m 33s [INFO] running `Command { std: "docker" "inspect" "89267af5d38e76c2f6a857037a4e290120f00e4c63522030ff7857268fad501d", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "89267af5d38e76c2f6a857037a4e290120f00e4c63522030ff7857268fad501d", kill_on_drop: false }` [INFO] [stdout] 89267af5d38e76c2f6a857037a4e290120f00e4c63522030ff7857268fad501d [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-111/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-111/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] eff4c0a3153795463806c9d0d2ea36863871ed0184ba93db00f41687c0bef20b [INFO] running `Command { std: "docker" "start" "-a" "eff4c0a3153795463806c9d0d2ea36863871ed0184ba93db00f41687c0bef20b", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Compiling chat v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/lib.rs:111:9 [INFO] [stdout] | [INFO] [stdout] 111 | let mut stream = acceptor.accept(stream).await?; [INFO] [stdout] | ----^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::io::prelude` [INFO] [stdout] --> src/lib.rs:8:5 [INFO] [stdout] | [INFO] [stdout] 8 | use std::io::prelude::*; [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused imports: `future`, `pin_mut` [INFO] [stdout] --> examples/client.rs:2:20 [INFO] [stdout] | [INFO] [stdout] 2 | use futures_util::{future, pin_mut, StreamExt, SinkExt}; [INFO] [stdout] | ^^^^^^ ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `AsyncWriteExt` [INFO] [stdout] --> examples/client.rs:3:31 [INFO] [stdout] | [INFO] [stdout] 3 | use tokio::io::{AsyncReadExt, AsyncWriteExt}; [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> examples/client.rs:13:9 [INFO] [stdout] | [INFO] [stdout] 13 | let ( mut stdin_tx, mut stdin_rx ) = futures_channel::mpsc::unbounded(); [INFO] [stdout] | ----^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused `Result` that must be used [INFO] [stdout] --> examples/client.rs:48:5 [INFO] [stdout] | [INFO] [stdout] 48 | tx.unbounded_send(Message::Text(msg)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_must_use)]` on by default [INFO] [stdout] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/lib.rs:111:9 [INFO] [stdout] | [INFO] [stdout] 111 | let mut stream = acceptor.accept(stream).await?; [INFO] [stdout] | ----^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::io::prelude` [INFO] [stdout] --> src/lib.rs:8:5 [INFO] [stdout] | [INFO] [stdout] 8 | use std::io::prelude::*; [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 5.33s [INFO] [stderr] Executable unittests src/lib.rs (/opt/rustwide/target/debug/deps/chat-448d318871d3d77a) [INFO] [stderr] Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/chat-3555b11cbc9c3065) [INFO] running `Command { std: "docker" "inspect" "eff4c0a3153795463806c9d0d2ea36863871ed0184ba93db00f41687c0bef20b", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "eff4c0a3153795463806c9d0d2ea36863871ed0184ba93db00f41687c0bef20b", kill_on_drop: false }` [INFO] [stdout] eff4c0a3153795463806c9d0d2ea36863871ed0184ba93db00f41687c0bef20b [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-111/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-111/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] bd19bd674432047cf69bfd2c3ac6425be130222fcb0ff2c5ba8a222b1518864f [INFO] running `Command { std: "docker" "start" "-a" "bd19bd674432047cf69bfd2c3ac6425be130222fcb0ff2c5ba8a222b1518864f", kill_on_drop: false }` [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/lib.rs:111:9 [INFO] [stderr] | [INFO] [stderr] 111 | let mut stream = acceptor.accept(stream).await?; [INFO] [stderr] | ----^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_mut)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::io::prelude` [INFO] [stderr] --> src/lib.rs:8:5 [INFO] [stderr] | [INFO] [stderr] 8 | use std::io::prelude::*; [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_imports)]` on by default [INFO] [stderr] [INFO] [stderr] warning: `chat` (lib) generated 2 warnings [INFO] [stderr] warning: `chat` (lib test) generated 2 warnings (2 duplicates) [INFO] [stderr] warning: unused imports: `future`, `pin_mut` [INFO] [stderr] --> examples/client.rs:2:20 [INFO] [stderr] | [INFO] [stderr] 2 | use futures_util::{future, pin_mut, StreamExt, SinkExt}; [INFO] [stderr] | ^^^^^^ ^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_imports)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused import: `AsyncWriteExt` [INFO] [stderr] --> examples/client.rs:3:31 [INFO] [stderr] | [INFO] [stderr] 3 | use tokio::io::{AsyncReadExt, AsyncWriteExt}; [INFO] [stderr] | ^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> examples/client.rs:13:9 [INFO] [stderr] | [INFO] [stderr] 13 | let ( mut stdin_tx, mut stdin_rx ) = futures_channel::mpsc::unbounded(); [INFO] [stderr] | ----^^^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_mut)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused `Result` that must be used [INFO] [stderr] --> examples/client.rs:48:5 [INFO] [stderr] | [INFO] [stderr] 48 | tx.unbounded_send(Message::Text(msg)); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_must_use)]` on by default [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: `chat` (example "client") generated 4 warnings [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.18s [INFO] [stderr] Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/chat-448d318871d3d77a) [INFO] [stdout] [INFO] [stdout] running 0 tests [INFO] [stderr] Running unittests src/main.rs (/opt/rustwide/target/debug/deps/chat-3555b11cbc9c3065) [INFO] [stdout] [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.04s [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] running 0 tests [INFO] [stdout] [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] [stderr] Doc-tests chat [INFO] [stdout] [INFO] [stdout] running 0 tests [INFO] [stdout] [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] running `Command { std: "docker" "inspect" "bd19bd674432047cf69bfd2c3ac6425be130222fcb0ff2c5ba8a222b1518864f", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "bd19bd674432047cf69bfd2c3ac6425be130222fcb0ff2c5ba8a222b1518864f", kill_on_drop: false }` [INFO] [stdout] bd19bd674432047cf69bfd2c3ac6425be130222fcb0ff2c5ba8a222b1518864f