[INFO] updating cached repository https://github.com/Vlad-Shcherbina/rusty_sand
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d7cd7bea636748d68b9505c9c2df38d7b61aa261
[INFO] testing Vlad-Shcherbina/rusty_sand against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FVlad-Shcherbina%2Frusty_sand" "/workspace/builds/worker-60/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-60/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Vlad-Shcherbina/rusty_sand on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Vlad-Shcherbina/rusty_sand
[INFO] finished tweaking git repo https://github.com/Vlad-Shcherbina/rusty_sand
[INFO] tweaked toml for git repo https://github.com/Vlad-Shcherbina/rusty_sand written to /workspace/builds/worker-60/source/Cargo.toml
[INFO] crate git repo https://github.com/Vlad-Shcherbina/rusty_sand already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/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" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0b552bd95b0cdfe9d9daa7c5af03735df0677b2224c5b7251553461b4ce1b76f
[INFO] running `Command { std: "docker" "start" "-a" "0b552bd95b0cdfe9d9daa7c5af03735df0677b2224c5b7251553461b4ce1b76f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0b552bd95b0cdfe9d9daa7c5af03735df0677b2224c5b7251553461b4ce1b76f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b552bd95b0cdfe9d9daa7c5af03735df0677b2224c5b7251553461b4ce1b76f", kill_on_drop: false }`
[INFO] [stdout] 0b552bd95b0cdfe9d9daa7c5af03735df0677b2224c5b7251553461b4ce1b76f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/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" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c4d891e77f776af3cc791c5e96d5a41a2f3534c7edcfa45b176e2bf51fb87ee8
[INFO] running `Command { std: "docker" "start" "-a" "c4d891e77f776af3cc791c5e96d5a41a2f3534c7edcfa45b176e2bf51fb87ee8", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.99
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling amd64_gen v0.1.0 (/opt/rustwide/workdir/amd64_gen)
[INFO] [stderr]    Compiling remove_dir_all v0.5.3
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling exe_buf v0.1.0 (/opt/rustwide/workdir/exe_buf)
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rusty_sand v0.1.0 (/opt/rustwide/workdir/rusty_sand)
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> rusty_sand/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(asm)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> rusty_sand/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(llvm_asm)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> rusty_sand/src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(naked_functions)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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 `rusty_sand` due to 4 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "c4d891e77f776af3cc791c5e96d5a41a2f3534c7edcfa45b176e2bf51fb87ee8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c4d891e77f776af3cc791c5e96d5a41a2f3534c7edcfa45b176e2bf51fb87ee8", kill_on_drop: false }`
[INFO] [stdout] c4d891e77f776af3cc791c5e96d5a41a2f3534c7edcfa45b176e2bf51fb87ee8