[INFO] cloning repository https://github.com/fangerm/cloxrs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/fangerm/cloxrs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffangerm%2Fcloxrs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffangerm%2Fcloxrs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e725ab89207596457d06b94cd8fc83c84521bde6
[INFO] testing fangerm/cloxrs against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffangerm%2Fcloxrs" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/fangerm/cloxrs on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/fangerm/cloxrs
[INFO] finished tweaking git repo https://github.com/fangerm/cloxrs
[INFO] tweaked toml for git repo https://github.com/fangerm/cloxrs written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/fangerm/cloxrs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded string-interner v0.12.1
[INFO] [stderr]   Downloaded plain_enum v0.7.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a50f40fadfcd840c222ab0d31ca0e64f637bebcbf354a517655bc6b07efd0fc2
[INFO] running `Command { std: "docker" "start" "-a" "a50f40fadfcd840c222ab0d31ca0e64f637bebcbf354a517655bc6b07efd0fc2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a50f40fadfcd840c222ab0d31ca0e64f637bebcbf354a517655bc6b07efd0fc2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a50f40fadfcd840c222ab0d31ca0e64f637bebcbf354a517655bc6b07efd0fc2", kill_on_drop: false }`
[INFO] [stdout] a50f40fadfcd840c222ab0d31ca0e64f637bebcbf354a517655bc6b07efd0fc2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fddebfb7a5002ba3d685b9c160deacac1ce5de49e02dda7cab8a40bcf621178a
[INFO] running `Command { std: "docker" "start" "-a" "fddebfb7a5002ba3d685b9c160deacac1ce5de49e02dda7cab8a40bcf621178a", kill_on_drop: false }`
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling serde v1.0.118
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling plain_enum v0.7.0
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling smallvec v1.6.1
[INFO] [stderr]    Compiling smol_str v0.1.17
[INFO] [stderr]    Compiling rustc-hash v1.1.0
[INFO] [stderr]    Compiling hashbrown v0.9.1
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]    Compiling enum-methods v0.0.8
[INFO] [stderr]    Compiling string-interner v0.12.1
[INFO] [stderr]    Compiling cloxrs v1.0.0 (/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(const_mut_refs)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(const_fn_fn_ptr_basics)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cloxrs` due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "fddebfb7a5002ba3d685b9c160deacac1ce5de49e02dda7cab8a40bcf621178a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fddebfb7a5002ba3d685b9c160deacac1ce5de49e02dda7cab8a40bcf621178a", kill_on_drop: false }`
[INFO] [stdout] fddebfb7a5002ba3d685b9c160deacac1ce5de49e02dda7cab8a40bcf621178a