[INFO] fetching crate gm 0.1.0...
[INFO] testing gm-0.1.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate gm 0.1.0 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate gm 0.1.0
[INFO] finished tweaking crates.io crate gm 0.1.0
[INFO] tweaked toml for crates.io crate gm 0.1.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate gm 0.1.0 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate gm 0.1.0 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" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 40e9cbb8aa0da45cf2028adf6ed325dacb5cecb12683c1d532986c943c7cb2e2
[INFO] running `Command { std: "docker" "start" "-a" "40e9cbb8aa0da45cf2028adf6ed325dacb5cecb12683c1d532986c943c7cb2e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "40e9cbb8aa0da45cf2028adf6ed325dacb5cecb12683c1d532986c943c7cb2e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "40e9cbb8aa0da45cf2028adf6ed325dacb5cecb12683c1d532986c943c7cb2e2", kill_on_drop: false }`
[INFO] [stdout] 40e9cbb8aa0da45cf2028adf6ed325dacb5cecb12683c1d532986c943c7cb2e2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ef6e64f9b193122a794977893a33ae1826a12def0bc8b4f575f9c1797a208d65
[INFO] running `Command { std: "docker" "start" "-a" "ef6e64f9b193122a794977893a33ae1826a12def0bc8b4f575f9c1797a208d65", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.87
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[INFO] [stderr]    Compiling gix-refspec v0.25.0
[INFO] [stderr]    Compiling gix-archive v0.15.0
[INFO] [stderr]    Compiling gix-discover v0.35.0
[INFO] [stderr]    Compiling gix-config v0.40.0
[INFO] [stderr]    Compiling gix-odb v0.63.0
[INFO] [stderr]    Compiling gix-worktree v0.36.0
[INFO] [stderr]    Compiling gix-diff v0.46.0
[INFO] [stderr]    Compiling gix-dir v0.8.0
[INFO] [stderr]    Compiling gix-worktree-state v0.13.0
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[INFO] [stderr]    Compiling gix-submodule v0.14.0
[INFO] [stderr]    Compiling gix v0.66.0
[INFO] [stderr]    Compiling gm v0.1.0 (/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(slice_split_once)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `gm` (bin "gm") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "ef6e64f9b193122a794977893a33ae1826a12def0bc8b4f575f9c1797a208d65", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef6e64f9b193122a794977893a33ae1826a12def0bc8b4f575f9c1797a208d65", kill_on_drop: false }`
[INFO] [stdout] ef6e64f9b193122a794977893a33ae1826a12def0bc8b4f575f9c1797a208d65