[INFO] fetching crate tuxmux 0.2.3...
[INFO] checking tuxmux-0.2.3 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate tuxmux 0.2.3 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate tuxmux 0.2.3
[INFO] finished tweaking crates.io crate tuxmux 0.2.3
[INFO] tweaked toml for crates.io crate tuxmux 0.2.3 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate tuxmux 0.2.3 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 tuxmux 0.2.3 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] c99aee46a55a989809207827526e5d087baaab1f89b475f0cabe926afdb79ef7
[INFO] running `Command { std: "docker" "start" "-a" "c99aee46a55a989809207827526e5d087baaab1f89b475f0cabe926afdb79ef7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c99aee46a55a989809207827526e5d087baaab1f89b475f0cabe926afdb79ef7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c99aee46a55a989809207827526e5d087baaab1f89b475f0cabe926afdb79ef7", kill_on_drop: false }`
[INFO] [stdout] c99aee46a55a989809207827526e5d087baaab1f89b475f0cabe926afdb79ef7
[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] 509b0edf92a0c5a94f77904716fcaeb9802c7bc570cb69f5cadbc88d42417a0f
[INFO] running `Command { std: "docker" "start" "-a" "509b0edf92a0c5a94f77904716fcaeb9802c7bc570cb69f5cadbc88d42417a0f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.155
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[INFO] [stderr]    Compiling time-macros v0.2.18
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[INFO] [stderr]     Checking bstr v1.9.1
[INFO] [stderr]     Checking tmux_interface v0.3.2
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[INFO] [stderr]     Checking tuxmux v0.2.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `src` is never read
[INFO] [stdout]   --> src/config/error.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     pub src: Source,
[INFO] [stdout]    |         ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `kind` is never read
[INFO] [stdout]   --> src/config/error.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub kind: ParseError,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `src` is never read
[INFO] [stdout]   --> src/config/error.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     pub src: Source,
[INFO] [stdout]    |         ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `kind` is never read
[INFO] [stdout]   --> src/config/error.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub kind: ParseError,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ConfigError` is never constructed
[INFO] [stdout]  --> src/config/error.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub struct ConfigError {
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/cmd/attach.rs:77:22
[INFO] [stdout]    |
[INFO] [stdout] 77 |                     &PathBuf::from_str(matches.first().expect("Matches length is checked to be 1"))
[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<PathBuf, Infallible>
[INFO] [stdout]   --> src/util/mod.rs:23:23
[INFO] [stdout]    |
[INFO] [stdout] 23 |         (Ok(p), _) => PathBuf::from_str(&p).unwrap(),
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/util/mod.rs:24:23
[INFO] [stdout]    |
[INFO] [stdout] 24 |         (_, Ok(p)) => PathBuf::from_str(&p).unwrap().join("tuxmux"),
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/util/mod.rs:41:23
[INFO] [stdout]    |
[INFO] [stdout] 41 |         (Ok(p), _) => PathBuf::from_str(&p).unwrap(),
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/util/mod.rs:42:23
[INFO] [stdout]    |
[INFO] [stdout] 42 |         (_, Ok(p)) => PathBuf::from_str(&p).unwrap().join("tuxmux"),
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ConfigError` is never constructed
[INFO] [stdout]  --> src/config/error.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub struct ConfigError {
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/cmd/attach.rs:77:22
[INFO] [stdout]    |
[INFO] [stdout] 77 |                     &PathBuf::from_str(matches.first().expect("Matches length is checked to be 1"))
[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 `tuxmux` (lib test) due to 5 previous errors; 3 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/util/mod.rs:23:23
[INFO] [stdout]    |
[INFO] [stdout] 23 |         (Ok(p), _) => PathBuf::from_str(&p).unwrap(),
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/util/mod.rs:24:23
[INFO] [stdout]    |
[INFO] [stdout] 24 |         (_, Ok(p)) => PathBuf::from_str(&p).unwrap().join("tuxmux"),
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/util/mod.rs:41:23
[INFO] [stdout]    |
[INFO] [stdout] 41 |         (Ok(p), _) => PathBuf::from_str(&p).unwrap(),
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/util/mod.rs:42:23
[INFO] [stdout]    |
[INFO] [stdout] 42 |         (_, Ok(p)) => PathBuf::from_str(&p).unwrap().join("tuxmux"),
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tuxmux` (lib) due to 5 previous errors; 3 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "509b0edf92a0c5a94f77904716fcaeb9802c7bc570cb69f5cadbc88d42417a0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "509b0edf92a0c5a94f77904716fcaeb9802c7bc570cb69f5cadbc88d42417a0f", kill_on_drop: false }`
[INFO] [stdout] 509b0edf92a0c5a94f77904716fcaeb9802c7bc570cb69f5cadbc88d42417a0f