[INFO] cloning repository https://github.com/Sleepy-Kitten/mutator
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Sleepy-Kitten/mutator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSleepy-Kitten%2Fmutator", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSleepy-Kitten%2Fmutator'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 08b60b11aba1acd90de1f1f77af097bdc47b8a87
[INFO] checking Sleepy-Kitten/mutator against beta-2021-10-15 for beta-1.56-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSleepy-Kitten%2Fmutator" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Sleepy-Kitten/mutator on toolchain beta-2021-10-15
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-10-15" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Sleepy-Kitten/mutator
[INFO] finished tweaking git repo https://github.com/Sleepy-Kitten/mutator
[INFO] tweaked toml for git repo https://github.com/Sleepy-Kitten/mutator written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/Sleepy-Kitten/mutator already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-10-15" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded evalexpr v6.5.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-10-15" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a3e541750543ae8f3929d39a7226968760a6297d23858da74eeb81adf45412b5
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "a3e541750543ae8f3929d39a7226968760a6297d23858da74eeb81adf45412b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a3e541750543ae8f3929d39a7226968760a6297d23858da74eeb81adf45412b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a3e541750543ae8f3929d39a7226968760a6297d23858da74eeb81adf45412b5", kill_on_drop: false }`
[INFO] [stdout] a3e541750543ae8f3929d39a7226968760a6297d23858da74eeb81adf45412b5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-10-15" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] e7366f3d9a89d1de44350164dc4b7f26ef2017c46abc668ef6c9236f50cddad9
[INFO] running `Command { std: "docker" "start" "-a" "e7366f3d9a89d1de44350164dc4b7f26ef2017c46abc668ef6c9236f50cddad9", kill_on_drop: false }`
[INFO] [stderr]    Compiling futures-core v0.3.17
[INFO] [stderr]     Checking futures-sink v0.3.17
[INFO] [stderr]     Checking evalexpr v6.5.0
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]    Compiling futures-macro v0.3.17
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking futures-channel v0.3.17
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking csv v1.1.6
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking futures-util v0.3.17
[INFO] [stderr]     Checking futures-executor v0.3.17
[INFO] [stderr]     Checking futures v0.3.17
[INFO] [stderr]     Checking mutator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(available_concurrency)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable call
[INFO] [stdout]    --> src/tweak.rs:146:5
[INFO] [stdout]     |
[INFO] [stdout] 146 |     tweak(&input, todo!())
[INFO] [stdout]     |     ^^^^^         ------- any code following this expression is unreachable
[INFO] [stdout]     |     |
[INFO] [stdout]     |     unreachable call
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(available_concurrency)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable call
[INFO] [stdout]    --> src/tweak.rs:146:5
[INFO] [stdout]     |
[INFO] [stdout] 146 |     tweak(&input, todo!())
[INFO] [stdout]     |     ^^^^^         ------- any code following this expression is unreachable
[INFO] [stdout]     |     |
[INFO] [stdout]     |     unreachable call
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mutator` due to 2 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "e7366f3d9a89d1de44350164dc4b7f26ef2017c46abc668ef6c9236f50cddad9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e7366f3d9a89d1de44350164dc4b7f26ef2017c46abc668ef6c9236f50cddad9", kill_on_drop: false }`
[INFO] [stdout] e7366f3d9a89d1de44350164dc4b7f26ef2017c46abc668ef6c9236f50cddad9
