[INFO] fetching crate chomsky-concretize 0.0.1...
[INFO] checking chomsky-concretize-0.0.1 against 1.95.0 for pr-155915
[INFO] extracting crate chomsky-concretize 0.0.1 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate chomsky-concretize 0.0.1
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate chomsky-concretize 0.0.1
[INFO] tweaked toml for crates.io crate chomsky-concretize 0.0.1 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate chomsky-concretize 0.0.1 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate chomsky-concretize 0.0.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded oak-core v0.0.4
[INFO] [stderr]   Downloaded chomsky-rule-engine v0.0.1
[INFO] [stderr]   Downloaded chomsky-uir v0.0.1
[INFO] [stderr]   Downloaded chomsky-types v0.0.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4a6c7c03b4fe3961b9a92831e87f5347f4c289d5c3807665bddb83ac398a307b
[INFO] running `Command { std: "docker" "start" "-a" "4a6c7c03b4fe3961b9a92831e87f5347f4c289d5c3807665bddb83ac398a307b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4a6c7c03b4fe3961b9a92831e87f5347f4c289d5c3807665bddb83ac398a307b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4a6c7c03b4fe3961b9a92831e87f5347f4c289d5c3807665bddb83ac398a307b", kill_on_drop: false }`
[INFO] [stdout] 4a6c7c03b4fe3961b9a92831e87f5347f4c289d5c3807665bddb83ac398a307b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 50ec9a9e783dcbae4a947223b526b092062242a4620367e3fa370ca47ae42e41
[INFO] running `Command { std: "docker" "start" "-a" "50ec9a9e783dcbae4a947223b526b092062242a4620367e3fa370ca47ae42e41", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]     Checking parking_lot_core v0.9.12
[INFO] [stderr]     Checking dashmap v6.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling tracing-attributes v0.1.31
[INFO] [stderr]     Checking tracing v0.1.44
[INFO] [stderr]     Checking serde v1.0.228
[INFO] [stderr]     Checking triomphe v0.1.15
[INFO] [stderr]     Checking chomsky-types v0.0.1
[INFO] [stderr]     Checking oak-core v0.0.4
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/oak-core-0.0.4/src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(allocator_api)] // Required for custom arena allocation and manual memory management
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `oak-core` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "50ec9a9e783dcbae4a947223b526b092062242a4620367e3fa370ca47ae42e41", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "50ec9a9e783dcbae4a947223b526b092062242a4620367e3fa370ca47ae42e41", kill_on_drop: false }`
[INFO] [stdout] 50ec9a9e783dcbae4a947223b526b092062242a4620367e3fa370ca47ae42e41