[INFO] fetching crate i3-back 0.3.2...
[INFO] testing i3-back-0.3.2 against 1.69.0 for beta-1.70-1
[INFO] extracting crate i3-back 0.3.2 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate i3-back 0.3.2 on toolchain 1.69.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.69.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate i3-back 0.3.2
[INFO] finished tweaking crates.io crate i3-back 0.3.2
[INFO] tweaked toml for crates.io crate i3-back 0.3.2 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate crates.io crate i3-back 0.3.2 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" "+1.69.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded i3ipc v0.10.1
[INFO] [stderr]   Downloaded clap v4.1.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f3cf6c2ae0188fd53876cd4b180c62b58687c106952d6a16ec675535c5a5e6f9
[INFO] running `Command { std: "docker" "start" "-a" "f3cf6c2ae0188fd53876cd4b180c62b58687c106952d6a16ec675535c5a5e6f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f3cf6c2ae0188fd53876cd4b180c62b58687c106952d6a16ec675535c5a5e6f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f3cf6c2ae0188fd53876cd4b180c62b58687c106952d6a16ec675535c5a5e6f9", kill_on_drop: false }`
[INFO] [stdout] f3cf6c2ae0188fd53876cd4b180c62b58687c106952d6a16ec675535c5a5e6f9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4faae8ae9f831a4a016eb3d6195d7e208a0b76ccdfdede8b42f54f32ff2a34a5
[INFO] running `Command { std: "docker" "start" "-a" "4faae8ae9f831a4a016eb3d6195d7e208a0b76ccdfdede8b42f54f32ff2a34a5", kill_on_drop: false }`
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling proc-macro2 v1.0.51
[INFO] [stderr]    Compiling unicode-ident v1.0.6
[INFO] [stderr]    Compiling quote v1.0.23
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling bitflags v1.3.2
[INFO] [stderr]    Compiling io-lifetimes v1.0.5
[INFO] [stderr]    Compiling rustix v0.36.8
[INFO] [stderr]    Compiling serde v1.0.152
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling linux-raw-sys v0.1.4
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling serde_json v1.0.93
[INFO] [stderr]    Compiling ryu v1.0.12
[INFO] [stderr]    Compiling static_assertions v1.1.0
[INFO] [stderr]    Compiling anyhow v1.0.69
[INFO] [stderr]    Compiling itoa v1.0.5
[INFO] [stderr]    Compiling heck v0.4.1
[INFO] [stderr]    Compiling os_str_bytes v6.4.1
[INFO] [stderr]    Compiling clap_lex v0.3.2
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling once_cell v1.17.1
[INFO] [stderr]    Compiling termcolor v1.2.0
[INFO] [stderr]    Compiling strsim v0.10.0
[INFO] [stderr]    Compiling nix v0.26.2
[INFO] [stderr]    Compiling ctrlc v3.2.5
[INFO] [stderr]    Compiling is-terminal v0.4.4
[INFO] [stderr]    Compiling clap_derive v4.1.0
[INFO] [stderr]    Compiling i3ipc v0.10.1
[INFO] [stderr]    Compiling clap v4.1.6
[INFO] [stderr]    Compiling i3-back v0.3.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(let_chains)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `i3-back` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "4faae8ae9f831a4a016eb3d6195d7e208a0b76ccdfdede8b42f54f32ff2a34a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4faae8ae9f831a4a016eb3d6195d7e208a0b76ccdfdede8b42f54f32ff2a34a5", kill_on_drop: false }`
[INFO] [stdout] 4faae8ae9f831a4a016eb3d6195d7e208a0b76ccdfdede8b42f54f32ff2a34a5
