[INFO] fetching crate aces 0.0.13...
[INFO] checking aces-0.0.13 against 1.55.0 for beta-1.56-3
[INFO] extracting crate aces 0.0.13 into /workspace/builds/worker-103/source
[INFO] validating manifest of crates.io crate aces 0.0.13 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 crates.io crate aces 0.0.13
[INFO] finished tweaking crates.io crate aces 0.0.13
[INFO] tweaked toml for crates.io crate aces 0.0.13 written to /workspace/builds/worker-103/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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" "+1.55.0" "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-103/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-103/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] c46cffb9ac9bb1708a0ae1bceb2dd1dbe2bb2a2b9d8b4e205e357cb6c6568d13
[INFO] running `Command { std: "docker" "start" "-a" "c46cffb9ac9bb1708a0ae1bceb2dd1dbe2bb2a2b9d8b4e205e357cb6c6568d13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c46cffb9ac9bb1708a0ae1bceb2dd1dbe2bb2a2b9d8b4e205e357cb6c6568d13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c46cffb9ac9bb1708a0ae1bceb2dd1dbe2bb2a2b9d8b4e205e357cb6c6568d13", kill_on_drop: false }`
[INFO] [stdout] c46cffb9ac9bb1708a0ae1bceb2dd1dbe2bb2a2b9d8b4e205e357cb6c6568d13
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-103/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-103/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" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4051449f6f5393b0242c4f8dec2c697aa8b873fadda31a86fb5d27aaacc49cbd
[INFO] running `Command { std: "docker" "start" "-a" "4051449f6f5393b0242c4f8dec2c697aa8b873fadda31a86fb5d27aaacc49cbd", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]    Compiling anyhow v1.0.44
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking varisat-formula v0.2.2
[INFO] [stderr]    Compiling regex-syntax v0.6.25
[INFO] [stderr]     Checking rustc-hash v1.1.0
[INFO] [stderr]     Checking siphasher v0.3.7
[INFO] [stderr]     Checking vec_mut_scan v0.3.0
[INFO] [stderr]     Checking new_debug_unreachable v1.0.4
[INFO] [stderr]     Checking leb128 v0.2.5
[INFO] [stderr]     Checking precomputed-hash v0.1.1
[INFO] [stderr]     Checking bit-vec v0.6.3
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]     Checking yaml-rust v0.4.5
[INFO] [stderr]     Checking getrandom v0.1.16
[INFO] [stderr]     Checking parking_lot_core v0.8.5
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking colored v1.9.3
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking parking_lot v0.11.2
[INFO] [stderr]     Checking phf_shared v0.8.0
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]    Compiling aho-corasick v0.7.18
[INFO] [stderr]     Checking fern v0.6.0
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking varisat-internal-proof v0.2.2
[INFO] [stderr]    Compiling varisat v0.2.2
[INFO] [stderr]     Checking ordered-float v2.8.0
[INFO] [stderr]    Compiling regex v1.5.4
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]    Compiling partial_ref_derive v0.3.3
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]     Checking partial_ref v0.3.3
[INFO] [stderr]    Compiling varisat-internal-macros v0.2.2
[INFO] [stderr]     Checking thiserror v1.0.30
[INFO] [stderr]     Checking varisat-dimacs v0.2.2
[INFO] [stderr]     Checking varisat-checker v0.2.2
[INFO] [stderr]     Checking serde v1.0.130
[INFO] [stderr]     Checking string_cache v0.8.2
[INFO] [stderr]     Checking aces v0.0.13 (/opt/rustwide/workdir)
[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(bool_to_option)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[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(bool_to_option)]
[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] [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 `aces` 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" "4051449f6f5393b0242c4f8dec2c697aa8b873fadda31a86fb5d27aaacc49cbd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4051449f6f5393b0242c4f8dec2c697aa8b873fadda31a86fb5d27aaacc49cbd", kill_on_drop: false }`
[INFO] [stdout] 4051449f6f5393b0242c4f8dec2c697aa8b873fadda31a86fb5d27aaacc49cbd
