[INFO] fetching crate serial-rs 0.2.1...
[INFO] checking serial-rs-0.2.1 against master#8c32e313cccf7df531e2d49ffb8227bb92304aee for pr-145608-1
[INFO] extracting crate serial-rs 0.2.1 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate serial-rs 0.2.1
[INFO] finished tweaking crates.io crate serial-rs 0.2.1
[INFO] tweaked toml for crates.io crate serial-rs 0.2.1 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate serial-rs 0.2.1 on toolchain 8c32e313cccf7df531e2d49ffb8227bb92304aee
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate serial-rs 0.2.1 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" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded autocfg v1.1.0
[INFO] [stderr]   Downloaded memoffset v0.6.5
[INFO] [stderr]   Downloaded bitflags v1.3.2
[INFO] [stderr]   Downloaded glob v0.3.0
[INFO] [stderr]   Downloaded cc v1.0.73
[INFO] [stderr]   Downloaded memchr v2.4.1
[INFO] [stderr]   Downloaded aho-corasick v0.7.18
[INFO] [stderr]   Downloaded regex v1.5.4
[INFO] [stderr]   Downloaded nix v0.23.1
[INFO] [stderr]   Downloaded regex-syntax v0.6.25
[INFO] [stderr]   Downloaded libc v0.2.119
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 283a602a09dfe170d4a713a92c40ebf65c7782dfc9b61c9aaffed0098d1a7bdb
[INFO] running `Command { std: "docker" "start" "-a" "283a602a09dfe170d4a713a92c40ebf65c7782dfc9b61c9aaffed0098d1a7bdb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "283a602a09dfe170d4a713a92c40ebf65c7782dfc9b61c9aaffed0098d1a7bdb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "283a602a09dfe170d4a713a92c40ebf65c7782dfc9b61c9aaffed0098d1a7bdb", kill_on_drop: false }`
[INFO] [stdout] 283a602a09dfe170d4a713a92c40ebf65c7782dfc9b61c9aaffed0098d1a7bdb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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" "-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3eb47e3b32a96803faa9b382d9c65d147e4c142c9088c0a6ec7458a47979079b
[INFO] running `Command { std: "docker" "start" "-a" "3eb47e3b32a96803faa9b382d9c65d147e4c142c9088c0a6ec7458a47979079b", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling libc v0.2.119
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking glob v0.3.0
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking nix v0.23.1
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking serial-rs v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Result`
[INFO] [stdout]  --> src/posix/ioctl.rs:4:99
[INFO] [stdout]   |
[INFO] [stdout] 4 | use nix::{ioctl_none_bad, libc, ioctl_read_bad, ioctl_write_ptr_bad, ioctl_read, ioctl_write_ptr, Result};
[INFO] [stdout]   |                                                                                                   ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Result`
[INFO] [stdout]  --> src/posix/ioctl.rs:4:99
[INFO] [stdout]   |
[INFO] [stdout] 4 | use nix::{ioctl_none_bad, libc, ioctl_read_bad, ioctl_write_ptr_bad, ioctl_read, ioctl_write_ptr, Result};
[INFO] [stdout]   |                                                                                                   ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/posix/port_lister.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |         let mut pat: Vec<PathBuf> = get_paths("/dev/ttyS*").into_iter()
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/posix/port_lister.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |         let mut pat: Vec<PathBuf> = get_paths("/dev/ttyS*").into_iter()
[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]   --> src/posix/port_lister.rs:52:21
[INFO] [stdout]    |
[INFO] [stdout] 52 |                     f.read_to_string(&mut s);
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 52 |                     let _ = f.read_to_string(&mut s);
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/posix/port_lister.rs:52:21
[INFO] [stdout]    |
[INFO] [stdout] 52 |                     f.read_to_string(&mut s);
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 52 |                     let _ = f.read_to_string(&mut s);
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `BufWriter` and `Read`
[INFO] [stdout]  --> examples/port_list.rs:1:15
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::io::{Read, BufReader, BufRead, Write, BufWriter};
[INFO] [stdout]   |               ^^^^                             ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.90s
[INFO] running `Command { std: "docker" "inspect" "3eb47e3b32a96803faa9b382d9c65d147e4c142c9088c0a6ec7458a47979079b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3eb47e3b32a96803faa9b382d9c65d147e4c142c9088c0a6ec7458a47979079b", kill_on_drop: false }`
[INFO] [stdout] 3eb47e3b32a96803faa9b382d9c65d147e4c142c9088c0a6ec7458a47979079b