[INFO] fetching crate mqtt-async-client 0.3.1...
[INFO] checking mqtt-async-client-0.3.1 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate mqtt-async-client 0.3.1 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate mqtt-async-client 0.3.1
[INFO] finished tweaking crates.io crate mqtt-async-client 0.3.1
[INFO] tweaked toml for crates.io crate mqtt-async-client 0.3.1 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate mqtt-async-client 0.3.1 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 crates.io crate mqtt-async-client 0.3.1 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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 6f37f4b8b687073076e4f50581c41ab0cccaf072fe8f478b0c0d16a8a4e855be
[INFO] running `Command { std: "docker" "start" "-a" "6f37f4b8b687073076e4f50581c41ab0cccaf072fe8f478b0c0d16a8a4e855be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6f37f4b8b687073076e4f50581c41ab0cccaf072fe8f478b0c0d16a8a4e855be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6f37f4b8b687073076e4f50581c41ab0cccaf072fe8f478b0c0d16a8a4e855be", kill_on_drop: false }`
[INFO] [stdout] 6f37f4b8b687073076e4f50581c41ab0cccaf072fe8f478b0c0d16a8a4e855be
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 199ddcdc1b9e067fac8af91c01c8045f29db7b5517d59fcebddd78c5ef7829c4
[INFO] running `Command { std: "docker" "start" "-a" "199ddcdc1b9e067fac8af91c01c8045f29db7b5517d59fcebddd78c5ef7829c4", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling version_check v0.9.3
[INFO] [stderr]     Checking untrusted v0.7.1
[INFO] [stderr]     Checking once_cell v1.8.0
[INFO] [stderr]     Checking spin v0.5.2
[INFO] [stderr]     Checking matches v0.1.8
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]     Checking tinyvec_macros v0.1.0
[INFO] [stderr]    Compiling ring v0.16.20
[INFO] [stderr]    Compiling futures-macro v0.3.16
[INFO] [stderr]    Compiling tokio v1.9.0
[INFO] [stderr]     Checking pin-project-lite v0.2.7
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling proc-macro-nested v0.1.7
[INFO] [stderr]    Compiling futures-core v0.3.16
[INFO] [stderr]    Compiling futures-task v0.3.16
[INFO] [stderr]     Checking unicode-bidi v0.3.5
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking tinyvec v1.3.1
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]    Compiling futures-util v0.3.16
[INFO] [stderr]     Checking bytes v1.0.1
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]     Checking percent-encoding v2.1.0
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking form_urlencoded v1.0.1
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking slab v0.4.3
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking mio v0.7.13
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking unicode-normalization v0.1.19
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking mqttrs v0.2.0
[INFO] [stderr]     Checking idna v0.2.3
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking url v2.2.2
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking webpki v0.21.4
[INFO] [stderr]     Checking sct v0.6.1
[INFO] [stderr]     Checking rustls v0.19.1
[INFO] [stderr]     Checking webpki-roots v0.18.0
[INFO] [stderr]    Compiling tokio-macros v1.3.0
[INFO] [stderr]    Compiling structopt-derive v0.4.15
[INFO] [stderr]     Checking structopt v0.3.22
[INFO] [stderr]     Checking tokio-rustls v0.22.0
[INFO] [stderr]     Checking mqtt-async-client v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> examples/mqttc.rs:39:5
[INFO] [stdout]    |
[INFO] [stdout] 39 | /     /// Username to authenticate with, optional.
[INFO] [stdout] 40 | |     #[structopt(long)]
[INFO] [stdout] 41 | |     username: Option<String>,
[INFO] [stdout]    | |____________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> examples/mqttc.rs:43:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | /     /// Password to authenticate with, optional.
[INFO] [stdout] 44 | |     #[structopt(long)]
[INFO] [stdout] 45 | |     password: Option<String>,
[INFO] [stdout]    | |____________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> examples/mqttc.rs:47:5
[INFO] [stdout]    |
[INFO] [stdout] 47 | /     /// Host to connect to, REQUIRED.
[INFO] [stdout] 48 | |     #[structopt(long)]
[INFO] [stdout] 49 | |     url: String,
[INFO] [stdout]    | |_______________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> examples/mqttc.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 | /     /// Client ID to identify as, optional.
[INFO] [stdout] 52 | |     #[structopt(long)]
[INFO] [stdout] 53 | |     client_id: Option<String>,
[INFO] [stdout]    | |_____________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> examples/mqttc.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 55 | /     /// Enable TLS and set the path to a PEM file containing the
[INFO] [stdout] 56 | |     /// CA certificate that signs the remote server's certificate.
[INFO] [stdout] 57 | |     #[structopt(long)]
[INFO] [stdout] 58 | |     tls_server_ca_file: Option<String>,
[INFO] [stdout]    | |______________________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> examples/mqttc.rs:65:5
[INFO] [stdout]    |
[INFO] [stdout] 65 | /     /// Enable TLS and set the path to a PEM file containing the
[INFO] [stdout] 66 | |     /// client certificate for client authentication.
[INFO] [stdout] 67 | |     #[structopt(long)]
[INFO] [stdout] 68 | |     tls_client_crt_file: Option<String>,
[INFO] [stdout]    | |_______________________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> examples/mqttc.rs:70:5
[INFO] [stdout]    |
[INFO] [stdout] 70 | /     /// Enable TLS and set the path to a PEM file containing the
[INFO] [stdout] 71 | |     /// client rsa key for client authentication.
[INFO] [stdout] 72 | |     #[structopt(long)]
[INFO] [stdout] 73 | |     tls_client_rsa_key_file: Option<String>,
[INFO] [stdout]    | |___________________________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> examples/mqttc.rs:83:5
[INFO] [stdout]    |
[INFO] [stdout] 83 | /     #[structopt(long, default_value("true"), possible_values(&["true", "false"]))]
[INFO] [stdout] 84 | |     auto_connect: String,
[INFO] [stdout]    | |________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> examples/mqttc.rs:95:5
[INFO] [stdout]    |
[INFO] [stdout] 95 | /     /// Topic name to publish to. REQUIRED
[INFO] [stdout] 96 | |     topic: String,
[INFO] [stdout]    | |_________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> examples/mqttc.rs:98:5
[INFO] [stdout]    |
[INFO] [stdout] 98 | /     /// Message payload to publish. REQUIRED.
[INFO] [stdout] 99 | |     message: String,
[INFO] [stdout]    | |___________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]    --> examples/mqttc.rs:118:5
[INFO] [stdout]     |
[INFO] [stdout] 118 | /     /// Topic names to subscribe to. REQUIRED
[INFO] [stdout] 119 | |     topic: Vec<String>,
[INFO] [stdout]     | |______________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mqtt-async-client` (example "mqttc") due to 11 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "199ddcdc1b9e067fac8af91c01c8045f29db7b5517d59fcebddd78c5ef7829c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "199ddcdc1b9e067fac8af91c01c8045f29db7b5517d59fcebddd78c5ef7829c4", kill_on_drop: false }`
[INFO] [stdout] 199ddcdc1b9e067fac8af91c01c8045f29db7b5517d59fcebddd78c5ef7829c4
