[INFO] fetching crate i3-focus-last 0.5.4...
[INFO] checking i3-focus-last-0.5.4 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate i3-focus-last 0.5.4 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate i3-focus-last 0.5.4
[INFO] finished tweaking crates.io crate i3-focus-last 0.5.4
[INFO] tweaked toml for crates.io crate i3-focus-last 0.5.4 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate i3-focus-last 0.5.4 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 i3-focus-last 0.5.4 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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 0a7a5eaecd31cb84d0aa891f224cfa9ae35420d65945f20e12415c2df04c999e
[INFO] running `Command { std: "docker" "start" "-a" "0a7a5eaecd31cb84d0aa891f224cfa9ae35420d65945f20e12415c2df04c999e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0a7a5eaecd31cb84d0aa891f224cfa9ae35420d65945f20e12415c2df04c999e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0a7a5eaecd31cb84d0aa891f224cfa9ae35420d65945f20e12415c2df04c999e", kill_on_drop: false }`
[INFO] [stdout] 0a7a5eaecd31cb84d0aa891f224cfa9ae35420d65945f20e12415c2df04c999e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 923bb6bd626d7235daee123deac8d2cf353279ed09f753d48a6f1dc9095a5748
[INFO] running `Command { std: "docker" "start" "-a" "923bb6bd626d7235daee123deac8d2cf353279ed09f753d48a6f1dc9095a5748", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.43
[INFO] [stderr]    Compiling syn v1.0.99
[INFO] [stderr]    Compiling serde_derive v1.0.143
[INFO] [stderr]    Compiling serde v1.0.143
[INFO] [stderr]    Compiling serde_json v1.0.83
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling thiserror-impl v1.0.32
[INFO] [stderr]    Compiling gumdrop_derive v0.8.1
[INFO] [stderr]     Checking gumdrop v0.8.1
[INFO] [stderr]     Checking thiserror v1.0.32
[INFO] [stderr]     Checking swayipc-types v1.1.0
[INFO] [stderr]     Checking swayipc v3.0.0
[INFO] [stderr]     Checking i3-focus-last v0.5.4 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]    --> src/main.rs:381:17
[INFO] [stdout]     |
[INFO] [stdout] 381 | #[derive(Debug, Options)]
[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 `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `i3-focus-last` (bin "i3-focus-last" test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]    --> src/main.rs:381:17
[INFO] [stdout]     |
[INFO] [stdout] 381 | #[derive(Debug, Options)]
[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 `Options` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `i3-focus-last` (bin "i3-focus-last") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "923bb6bd626d7235daee123deac8d2cf353279ed09f753d48a6f1dc9095a5748", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "923bb6bd626d7235daee123deac8d2cf353279ed09f753d48a6f1dc9095a5748", kill_on_drop: false }`
[INFO] [stdout] 923bb6bd626d7235daee123deac8d2cf353279ed09f753d48a6f1dc9095a5748