[INFO] fetching crate i3ctl 0.1.0...
[INFO] checking i3ctl-0.1.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate i3ctl 0.1.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate i3ctl 0.1.0
[INFO] finished tweaking crates.io crate i3ctl 0.1.0
[INFO] tweaked toml for crates.io crate i3ctl 0.1.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate i3ctl 0.1.0 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 100 packages to latest compatible versions
[INFO] [stderr]       Adding clap-verbosity-flag v0.2.0 (available: v3.0.4)
[INFO] [stderr]       Adding config v0.9.3 (available: v0.15.19)
[INFO] [stderr]       Adding directories v1.0.2 (available: v6.0.0)
[INFO] [stderr]       Adding pretty_env_logger v0.3.1 (available: v0.5.0)
[INFO] [stderr]       Adding structopt v0.2.18 (available: v0.3.26)
[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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] c4d60f17f6b2697f4555f92cce7c75cbde9b3c6b5d2ec0fc25b97a066771967f
[INFO] running `Command { std: "docker" "start" "-a" "c4d60f17f6b2697f4555f92cce7c75cbde9b3c6b5d2ec0fc25b97a066771967f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c4d60f17f6b2697f4555f92cce7c75cbde9b3c6b5d2ec0fc25b97a066771967f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c4d60f17f6b2697f4555f92cce7c75cbde9b3c6b5d2ec0fc25b97a066771967f", kill_on_drop: false }`
[INFO] [stdout] c4d60f17f6b2697f4555f92cce7c75cbde9b3c6b5d2ec0fc25b97a066771967f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 41be634a3a382015cf3ea77b6d231f47e457cb87396142e7ef8899752975b4f9
[INFO] running `Command { std: "docker" "start" "-a" "41be634a3a382015cf3ea77b6d231f47e457cb87396142e7ef8899752975b4f9", kill_on_drop: false }`
[INFO] [stderr]     Checking memchr v2.7.6
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]     Checking serde v0.8.23
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking lazy_static v0.2.11
[INFO] [stderr]     Checking toml v0.4.10
[INFO] [stderr]     Checking rust-ini v0.13.0
[INFO] [stderr]     Checking directories v1.0.2
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]     Checking aho-corasick v1.1.4
[INFO] [stderr]     Checking object v0.37.3
[INFO] [stderr]     Checking serde_json v1.0.145
[INFO] [stderr]     Checking i3ipc v0.10.1
[INFO] [stderr]     Checking regex-automata v0.4.13
[INFO] [stderr]     Checking serde_test v0.8.23
[INFO] [stderr]     Checking linked-hash-map v0.3.0
[INFO] [stderr]    Compiling structopt-derive v0.2.18
[INFO] [stderr]     Checking structopt v0.2.18
[INFO] [stderr]     Checking regex v1.12.2
[INFO] [stderr]     Checking env_logger v0.6.2
[INFO] [stderr]     Checking serde-hjson v0.8.2
[INFO] [stderr]     Checking env_logger v0.5.13
[INFO] [stderr]     Checking pretty_env_logger v0.3.1
[INFO] [stderr]     Checking backtrace v0.3.76
[INFO] [stderr]     Checking config v0.9.3
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking clap-verbosity-flag v0.2.0
[INFO] [stderr]     Checking i3ctl v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: enum `LoadSettingsError` is never used
[INFO] [stdout]    --> src/settings.rs:144:10
[INFO] [stdout]     |
[INFO] [stdout] 144 | pub enum LoadSettingsError {
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `TemplateError` is never used
[INFO] [stdout]    --> src/settings.rs:171:10
[INFO] [stdout]     |
[INFO] [stdout] 171 | pub enum TemplateError {
[INFO] [stdout]     |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/settings.rs:38:48
[INFO] [stdout]    |
[INFO] [stdout] 38 | #[derive(Debug, Clone, Serialize, Deserialize, StructOpt)]
[INFO] [stdout]    |                                                ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]    = note: this error originates in the derive macro `StructOpt` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `i3ctl` (bin "i3ctl" test) due to 1 previous error; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: enum `LoadSettingsError` is never used
[INFO] [stdout]    --> src/settings.rs:144:10
[INFO] [stdout]     |
[INFO] [stdout] 144 | pub enum LoadSettingsError {
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `TemplateError` is never used
[INFO] [stdout]    --> src/settings.rs:171:10
[INFO] [stdout]     |
[INFO] [stdout] 171 | pub enum TemplateError {
[INFO] [stdout]     |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/settings.rs:38:48
[INFO] [stdout]    |
[INFO] [stdout] 38 | #[derive(Debug, Clone, Serialize, Deserialize, StructOpt)]
[INFO] [stdout]    |                                                ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]    = note: this error originates in the derive macro `StructOpt` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `i3ctl` (bin "i3ctl") due to 1 previous error; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "41be634a3a382015cf3ea77b6d231f47e457cb87396142e7ef8899752975b4f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "41be634a3a382015cf3ea77b6d231f47e457cb87396142e7ef8899752975b4f9", kill_on_drop: false }`
[INFO] [stdout] 41be634a3a382015cf3ea77b6d231f47e457cb87396142e7ef8899752975b4f9