[INFO] fetching crate sfynx 0.1.0...
[INFO] testing sfynx-0.1.0 against 1.59.0 for beta-1.60-1
[INFO] extracting crate sfynx 0.1.0 into /workspace/builds/worker-20/source
[INFO] validating manifest of crates.io crate sfynx 0.1.0 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate sfynx 0.1.0
[INFO] finished tweaking crates.io crate sfynx 0.1.0
[INFO] tweaked toml for crates.io crate sfynx 0.1.0 written to /workspace/builds/worker-20/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "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" "+1.59.0" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded merlin v3.0.0
[INFO] [stderr]   Downloaded curve25519-dalek-ng v4.1.1
[INFO] [stderr]   Downloaded unicode-normalization v0.1.9
[INFO] [stderr]   Downloaded bip39 v1.0.1
[INFO] [stderr]   Downloaded cryptraits-macros v0.1.0
[INFO] [stderr]   Downloaded bitcoin_hashes v0.9.7
[INFO] [stderr]   Downloaded schnorrkel v0.10.2
[INFO] [stderr]   Downloaded subtle-ng v2.5.0
[INFO] [stderr]   Downloaded cryptraits v0.9.1
[INFO] [stderr]   Downloaded serde_bytes v0.11.5
[INFO] [stderr]   Downloaded cryptimitives v0.14.7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 384340278f59c195cffbecb2ca8a8899e6b744a4498af7a4014f424e40265a44
[INFO] running `Command { std: "docker" "start" "-a" "384340278f59c195cffbecb2ca8a8899e6b744a4498af7a4014f424e40265a44", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "384340278f59c195cffbecb2ca8a8899e6b744a4498af7a4014f424e40265a44", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "384340278f59c195cffbecb2ca8a8899e6b744a4498af7a4014f424e40265a44", kill_on_drop: false }`
[INFO] [stdout] 384340278f59c195cffbecb2ca8a8899e6b744a4498af7a4014f424e40265a44
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9dfe8b97b111d9ba3947b30c8184dec5ce2d4ad59786842e2361215a74c07c4f
[INFO] running `Command { std: "docker" "start" "-a" "9dfe8b97b111d9ba3947b30c8184dec5ce2d4ad59786842e2361215a74c07c4f", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.15.0
[INFO] [stderr]    Compiling libc v0.2.119
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]    Compiling cpufeatures v0.2.1
[INFO] [stderr]    Compiling subtle v2.4.1
[INFO] [stderr]    Compiling opaque-debug v0.3.0
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling keccak v0.1.0
[INFO] [stderr]    Compiling subtle-ng v2.5.0
[INFO] [stderr]    Compiling bitcoin_hashes v0.9.7
[INFO] [stderr]    Compiling arrayvec v0.7.2
[INFO] [stderr]    Compiling arrayref v0.3.6
[INFO] [stderr]    Compiling generic-array v0.14.5
[INFO] [stderr]    Compiling autocfg v0.1.8
[INFO] [stderr]    Compiling smallvec v0.6.14
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling unicode-normalization v0.1.9
[INFO] [stderr]    Compiling getrandom v0.2.5
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling block-buffer v0.10.2
[INFO] [stderr]    Compiling cipher v0.3.0
[INFO] [stderr]    Compiling crypto-common v0.1.3
[INFO] [stderr]    Compiling digest v0.9.0
[INFO] [stderr]    Compiling universal-hash v0.4.1
[INFO] [stderr]    Compiling block-buffer v0.9.0
[INFO] [stderr]    Compiling aead v0.4.3
[INFO] [stderr]    Compiling polyval v0.5.3
[INFO] [stderr]    Compiling digest v0.10.3
[INFO] [stderr]    Compiling sha2 v0.9.9
[INFO] [stderr]    Compiling aes v0.7.5
[INFO] [stderr]    Compiling ctr v0.8.0
[INFO] [stderr]    Compiling chacha20 v0.8.1
[INFO] [stderr]    Compiling ghash v0.4.4
[INFO] [stderr]    Compiling hmac v0.12.1
[INFO] [stderr]    Compiling sha2 v0.10.2
[INFO] [stderr]    Compiling hkdf v0.12.3
[INFO] [stderr]    Compiling aes-gcm v0.9.4
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling serde_bytes v0.11.5
[INFO] [stderr]    Compiling bip39 v1.0.1
[INFO] [stderr]    Compiling zeroize_derive v1.3.2
[INFO] [stderr]    Compiling cryptraits-macros v0.1.0
[INFO] [stderr]    Compiling zeroize v1.5.3
[INFO] [stderr]    Compiling curve25519-dalek-ng v4.1.1
[INFO] [stderr]    Compiling merlin v3.0.0
[INFO] [stderr]    Compiling cryptraits v0.9.1
[INFO] [stderr]    Compiling schnorrkel v0.10.2
[INFO] [stderr]    Compiling cryptimitives v0.14.7
[INFO] [stderr]    Compiling sfynx v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(explicit_generic_args_with_impl_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `sfynx` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "9dfe8b97b111d9ba3947b30c8184dec5ce2d4ad59786842e2361215a74c07c4f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9dfe8b97b111d9ba3947b30c8184dec5ce2d4ad59786842e2361215a74c07c4f", kill_on_drop: false }`
[INFO] [stdout] 9dfe8b97b111d9ba3947b30c8184dec5ce2d4ad59786842e2361215a74c07c4f