[INFO] fetching crate bls12_381_ietf 0.1.3...
[INFO] testing bls12_381_ietf-0.1.3 against 1.60.0 for beta-1.61-1
[INFO] extracting crate bls12_381_ietf 0.1.3 into /workspace/builds/worker-54/source
[INFO] validating manifest of crates.io crate bls12_381_ietf 0.1.3 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 crates.io crate bls12_381_ietf 0.1.3
[INFO] finished tweaking crates.io crate bls12_381_ietf 0.1.3
[INFO] tweaked toml for crates.io crate bls12_381_ietf 0.1.3 written to /workspace/builds/worker-54/source/Cargo.toml
[INFO] crate crates.io crate bls12_381_ietf 0.1.3 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 sha2 v0.8.1
[INFO] [stderr]   Downloaded ff_derive_ce v0.7.0
[INFO] [stderr]   Downloaded ff_ce v0.9.0
[INFO] [stderr]   Downloaded pairing_ce v0.20.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/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] 4cb268035710becbe64c857d5d71da0df37990b151710d0dce76855844410be8
[INFO] running `Command { std: "docker" "start" "-a" "4cb268035710becbe64c857d5d71da0df37990b151710d0dce76855844410be8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4cb268035710becbe64c857d5d71da0df37990b151710d0dce76855844410be8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4cb268035710becbe64c857d5d71da0df37990b151710d0dce76855844410be8", kill_on_drop: false }`
[INFO] [stdout] 4cb268035710becbe64c857d5d71da0df37990b151710d0dce76855844410be8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/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] cc5c8d84080b3822d1fcb8f09b89379d464391b43e9506a2fcfaf1f5a79c6423
[INFO] running `Command { std: "docker" "start" "-a" "cc5c8d84080b3822d1fcb8f09b89379d464391b43e9506a2fcfaf1f5a79c6423", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling typenum v1.11.2
[INFO] [stderr]    Compiling proc-macro2 v1.0.10
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling libc v0.2.68
[INFO] [stderr]    Compiling syn v1.0.17
[INFO] [stderr]    Compiling subtle v1.0.0
[INFO] [stderr]    Compiling byte-tools v0.3.1
[INFO] [stderr]    Compiling hex v0.4.2
[INFO] [stderr]    Compiling opaque-debug v0.2.3
[INFO] [stderr]    Compiling fake-simd v0.1.2
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling block-padding v0.1.5
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]    Compiling generic-array v0.12.3
[INFO] [stderr]    Compiling digest v0.8.1
[INFO] [stderr]    Compiling crypto-mac v0.7.0
[INFO] [stderr]    Compiling block-buffer v0.7.3
[INFO] [stderr]    Compiling hmac v0.7.1
[INFO] [stderr]    Compiling sha2 v0.8.1
[INFO] [stderr]    Compiling hkdf v0.8.0
[INFO] [stderr]    Compiling ff_derive_ce v0.7.0
[INFO] [stderr]    Compiling ff_ce v0.9.0
[INFO] [stderr]    Compiling pairing_ce v0.20.0
[INFO] [stderr]    Compiling bls12_381_ietf v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[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 `bls12_381_ietf` 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" "cc5c8d84080b3822d1fcb8f09b89379d464391b43e9506a2fcfaf1f5a79c6423", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cc5c8d84080b3822d1fcb8f09b89379d464391b43e9506a2fcfaf1f5a79c6423", kill_on_drop: false }`
[INFO] [stdout] cc5c8d84080b3822d1fcb8f09b89379d464391b43e9506a2fcfaf1f5a79c6423