[INFO] fetching crate serial-console 1.0.1...
[INFO] checking serial-console-1.0.1 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate serial-console 1.0.1 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate serial-console 1.0.1
[INFO] finished tweaking crates.io crate serial-console 1.0.1
[INFO] tweaked toml for crates.io crate serial-console 1.0.1 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate serial-console 1.0.1 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 serial-console 1.0.1 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-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] d0b4fd5b1d1ce813ffb5b3de18a6cddee61ce75a11f6bac5f96872b4872cc7c0
[INFO] running `Command { std: "docker" "start" "-a" "d0b4fd5b1d1ce813ffb5b3de18a6cddee61ce75a11f6bac5f96872b4872cc7c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d0b4fd5b1d1ce813ffb5b3de18a6cddee61ce75a11f6bac5f96872b4872cc7c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d0b4fd5b1d1ce813ffb5b3de18a6cddee61ce75a11f6bac5f96872b4872cc7c0", kill_on_drop: false }`
[INFO] [stdout] d0b4fd5b1d1ce813ffb5b3de18a6cddee61ce75a11f6bac5f96872b4872cc7c0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 6fb3cf5c4516da22e1f2c046a9fb94d9ceb35190af6d3a25bb748c22a1aa6bdd
[INFO] running `Command { std: "docker" "start" "-a" "6fb3cf5c4516da22e1f2c046a9fb94d9ceb35190af6d3a25bb748c22a1aa6bdd", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.113
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]    Compiling pkg-config v0.3.24
[INFO] [stderr]    Compiling nix v0.16.1
[INFO] [stderr]    Compiling indexmap v1.8.0
[INFO] [stderr]     Checking numtoa v0.1.0
[INFO] [stderr]    Compiling libudev-sys v0.1.4
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking termion v1.5.6
[INFO] [stderr]     Checking libudev v0.2.0
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling clap_derive v3.0.6
[INFO] [stderr]     Checking serialport v4.0.1
[INFO] [stderr]     Checking clap v3.0.10
[INFO] [stderr]     Checking serial-console v1.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:49:5
[INFO] [stdout]    |
[INFO] [stdout] 49 | /     /// Set the parity checking mode
[INFO] [stdout] 50 | |     #[clap(
[INFO] [stdout] 51 | |         name = "parity",
[INFO] [stdout] 52 | |         default_value = "N",
[INFO] [stdout] ...  |
[INFO] [stdout] 62 | |     )]
[INFO] [stdout] 63 | |     parity: 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<String, Infallible>
[INFO] [stdout]   --> src/main.rs:71:5
[INFO] [stdout]    |
[INFO] [stdout] 71 | /     /// Set the flow control mode
[INFO] [stdout] 72 | |     #[clap(
[INFO] [stdout] 73 | |         name = "flow control",
[INFO] [stdout] 74 | |         default_value = "N",
[INFO] [stdout] ...  |
[INFO] [stdout] 84 | |     )]
[INFO] [stdout] 85 | |     flow_control: String,
[INFO] [stdout]    | |________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `serial-console` (bin "scip" test) due to 2 previous errors
[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]   --> src/main.rs:49:5
[INFO] [stdout]    |
[INFO] [stdout] 49 | /     /// Set the parity checking mode
[INFO] [stdout] 50 | |     #[clap(
[INFO] [stdout] 51 | |         name = "parity",
[INFO] [stdout] 52 | |         default_value = "N",
[INFO] [stdout] ...  |
[INFO] [stdout] 62 | |     )]
[INFO] [stdout] 63 | |     parity: 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<String, Infallible>
[INFO] [stdout]   --> src/main.rs:71:5
[INFO] [stdout]    |
[INFO] [stdout] 71 | /     /// Set the flow control mode
[INFO] [stdout] 72 | |     #[clap(
[INFO] [stdout] 73 | |         name = "flow control",
[INFO] [stdout] 74 | |         default_value = "N",
[INFO] [stdout] ...  |
[INFO] [stdout] 84 | |     )]
[INFO] [stdout] 85 | |     flow_control: String,
[INFO] [stdout]    | |________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `serial-console` (bin "scip") due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "6fb3cf5c4516da22e1f2c046a9fb94d9ceb35190af6d3a25bb748c22a1aa6bdd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6fb3cf5c4516da22e1f2c046a9fb94d9ceb35190af6d3a25bb748c22a1aa6bdd", kill_on_drop: false }`
[INFO] [stdout] 6fb3cf5c4516da22e1f2c046a9fb94d9ceb35190af6d3a25bb748c22a1aa6bdd