[INFO] fetching crate serialport 4.8.1...
[INFO] checking serialport-4.8.1 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate serialport 4.8.1 into /workspace/builds/worker-6-tc2/source
[INFO] removed /workspace/builds/worker-6-tc2/source/.cargo/config.toml
[INFO] started tweaking crates.io crate serialport 4.8.1
[INFO] removed 0 missing examples
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate serialport 4.8.1
[INFO] tweaked toml for crates.io crate serialport 4.8.1 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate serialport 4.8.1 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 serialport 4.8.1 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-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 440a408c1baffab9631c9a6aadcbead03b477f71c2017da3d0efe7189cee7362
[INFO] running `Command { std: "docker" "start" "-a" "440a408c1baffab9631c9a6aadcbead03b477f71c2017da3d0efe7189cee7362", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "440a408c1baffab9631c9a6aadcbead03b477f71c2017da3d0efe7189cee7362", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "440a408c1baffab9631c9a6aadcbead03b477f71c2017da3d0efe7189cee7362", kill_on_drop: false }`
[INFO] [stdout] 440a408c1baffab9631c9a6aadcbead03b477f71c2017da3d0efe7189cee7362
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 412169f30a584a67a5dba2e79d0810ed85058e3ace4ca6513321f55109fc23b1
[INFO] running `Command { std: "docker" "start" "-a" "412169f30a584a67a5dba2e79d0810ed85058e3ace4ca6513321f55109fc23b1", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.163
[INFO] [stderr]    Compiling proc-macro2 v1.0.101
[INFO] [stderr]    Compiling thiserror v1.0.65
[INFO] [stderr]     Checking regex-syntax v0.6.29
[INFO] [stderr]    Compiling zerocopy v0.8.27
[INFO] [stderr]    Compiling libudev-sys v0.1.4
[INFO] [stderr]     Checking unicode-ident v1.0.19
[INFO] [stderr]    Compiling syn v2.0.56
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking aho-corasick v0.7.20
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]     Checking os_str_bytes v6.5.1
[INFO] [stderr]    Compiling rstest v0.12.0
[INFO] [stderr]    Compiling rstest_reuse v0.6.0
[INFO] [stderr]     Checking once_cell v1.17.2
[INFO] [stderr]     Checking textwrap v0.16.2
[INFO] [stderr]     Checking assert_hex v0.4.1
[INFO] [stderr]     Checking clap_lex v0.2.4
[INFO] [stderr]     Checking regex v1.7.3
[INFO] [stderr]    Compiling getrandom v0.2.16
[INFO] [stderr]     Checking quote v1.0.40
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking nix v0.26.4
[INFO] [stderr]     Checking libudev v0.3.0
[INFO] [stderr]    Compiling ppv-lite86 v0.2.21
[INFO] [stderr]     Checking env_logger v0.8.4
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]     Checking quickcheck v1.0.3
[INFO] [stderr]    Compiling thiserror-impl v1.0.65
[INFO] [stderr]    Compiling quickcheck_macros v1.1.0
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking unescaper v0.1.5
[INFO] [stderr]     Checking serialport v4.8.1 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling clap_derive v3.2.25
[INFO] [stderr]    Compiling envconfig_derive v0.10.0
[INFO] [stderr]     Checking envconfig v0.10.0
[INFO] [stderr]     Checking clap v3.2.25
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> examples/loopback.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 |     port: 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 `serialport` (example "loopback") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "412169f30a584a67a5dba2e79d0810ed85058e3ace4ca6513321f55109fc23b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "412169f30a584a67a5dba2e79d0810ed85058e3ace4ca6513321f55109fc23b1", kill_on_drop: false }`
[INFO] [stdout] 412169f30a584a67a5dba2e79d0810ed85058e3ace4ca6513321f55109fc23b1
