[INFO] fetching crate secp256kfun 0.6.2...
[INFO] testing secp256kfun-0.6.2 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate secp256kfun 0.6.2 into /workspace/builds/worker-59/source
[INFO] validating manifest of crates.io crate secp256kfun 0.6.2 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate secp256kfun 0.6.2
[INFO] finished tweaking crates.io crate secp256kfun 0.6.2
[INFO] tweaked toml for crates.io crate secp256kfun 0.6.2 written to /workspace/builds/worker-59/source/Cargo.toml
[INFO] crate crates.io crate secp256kfun 0.6.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "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-59/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-59/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" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5cfe34dda39452eb8b691deb506f2c6cc342ecfe920244a1d7c143283affd5f5
[INFO] running `Command { std: "docker" "start" "-a" "5cfe34dda39452eb8b691deb506f2c6cc342ecfe920244a1d7c143283affd5f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5cfe34dda39452eb8b691deb506f2c6cc342ecfe920244a1d7c143283affd5f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5cfe34dda39452eb8b691deb506f2c6cc342ecfe920244a1d7c143283affd5f5", kill_on_drop: false }`
[INFO] [stdout] 5cfe34dda39452eb8b691deb506f2c6cc342ecfe920244a1d7c143283affd5f5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-59/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-59/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" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c31ea1ba0925927754e02df3500dc968d4e73295b449efc3c2ce586c61d93ead
[INFO] running `Command { std: "docker" "start" "-a" "c31ea1ba0925927754e02df3500dc968d4e73295b449efc3c2ce586c61d93ead", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling typenum v1.13.0
[INFO] [stderr]    Compiling subtle-ng v2.4.1
[INFO] [stderr]    Compiling serde_derive v1.0.127
[INFO] [stderr]    Compiling serde v1.0.127
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]    Compiling secp256kfun_parity_backend v0.1.5
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling secp256kfun v0.6.2 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling digest v0.9.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:34
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![cfg_attr(feature = "nightly", feature(min_specialization, rustc_attrs))]
[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 `secp256kfun` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "c31ea1ba0925927754e02df3500dc968d4e73295b449efc3c2ce586c61d93ead", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c31ea1ba0925927754e02df3500dc968d4e73295b449efc3c2ce586c61d93ead", kill_on_drop: false }`
[INFO] [stdout] c31ea1ba0925927754e02df3500dc968d4e73295b449efc3c2ce586c61d93ead