[INFO] fetching crate ari 0.0.5...
[INFO] testing ari-0.0.5 against 1.54.0 for beta-1.55-1
[INFO] extracting crate ari 0.0.5 into /workspace/builds/worker-22/source
[INFO] validating manifest of crates.io crate ari 0.0.5 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ari 0.0.5
[INFO] finished tweaking crates.io crate ari 0.0.5
[INFO] tweaked toml for crates.io crate ari 0.0.5 written to /workspace/builds/worker-22/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "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-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4aca1be53d9c9f9c620f2887dd40494552096b9586667d6ff32e2cd97c8b385d
[INFO] running `Command { std: "docker" "start" "-a" "4aca1be53d9c9f9c620f2887dd40494552096b9586667d6ff32e2cd97c8b385d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4aca1be53d9c9f9c620f2887dd40494552096b9586667d6ff32e2cd97c8b385d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4aca1be53d9c9f9c620f2887dd40494552096b9586667d6ff32e2cd97c8b385d", kill_on_drop: false }`
[INFO] [stdout] 4aca1be53d9c9f9c620f2887dd40494552096b9586667d6ff32e2cd97c8b385d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] efd5be13929d832ed6abcb369527d57394be3c4f642fc61a37f8e1383854dbdd
[INFO] running `Command { std: "docker" "start" "-a" "efd5be13929d832ed6abcb369527d57394be3c4f642fc61a37f8e1383854dbdd", kill_on_drop: false }`
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling smallvec v1.6.1
[INFO] [stderr]    Compiling winapi v0.3.9
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling untrusted v0.7.1
[INFO] [stderr]    Compiling once_cell v1.8.0
[INFO] [stderr]    Compiling spin v0.5.2
[INFO] [stderr]    Compiling ari v0.0.5 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling unicode-width v0.1.8
[INFO] [stderr]    Compiling instant v0.1.10
[INFO] [stderr]    Compiling ring v0.16.20
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling lock_api v0.4.4
[INFO] [stderr]    Compiling parking_lot_core v0.8.3
[INFO] [stderr]    Compiling parking_lot v0.11.1
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     const_fn,
[INFO] [stdout]   |     ^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: split into finer-grained feature gates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | / #![feature(
[INFO] [stdout] 2 | |     box_syntax,
[INFO] [stdout] 3 | |     const_fn,
[INFO] [stdout] 4 | |     crate_visibility_modifier,
[INFO] [stdout] ... |
[INFO] [stdout] 8 | |     stmt_expr_attributes
[INFO] [stdout] 9 | | )]
[INFO] [stdout]   | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]  --> src/lib.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     specialization,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout]   = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]   = help: consider using `min_specialization` instead, which is more stable and complete
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0557.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ari`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "efd5be13929d832ed6abcb369527d57394be3c4f642fc61a37f8e1383854dbdd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "efd5be13929d832ed6abcb369527d57394be3c4f642fc61a37f8e1383854dbdd", kill_on_drop: false }`
[INFO] [stdout] efd5be13929d832ed6abcb369527d57394be3c4f642fc61a37f8e1383854dbdd
