[INFO] fetching crate mech-utilities 0.2.2...
[INFO] checking mech-utilities-0.2.2 against 1.95.0 for pr-155915
[INFO] extracting crate mech-utilities 0.2.2 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate mech-utilities 0.2.2
[INFO] finished tweaking crates.io crate mech-utilities 0.2.2
[INFO] tweaked toml for crates.io crate mech-utilities 0.2.2 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate mech-utilities 0.2.2 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 139 packages to latest compatible versions
[INFO] [stderr]       Adding hashbrown v0.14.5 (available: v0.17.1)
[INFO] [stderr]       Adding mech-core v0.2.75 (available: v0.3.5)
[INFO] [stderr]       Adding wasi v0.10.0+wasi-snapshot-preview1 (available: v0.10.2+wasi-snapshot-preview1)
[INFO] [stderr]       Adding websocket v0.26.5 (available: v0.27.1)
[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]  Downloading crates ...
[INFO] [stderr]   Downloaded typeable v0.1.2
[INFO] [stderr]   Downloaded traitobject v0.1.1
[INFO] [stderr]   Downloaded websocket v0.26.5
[INFO] [stderr]   Downloaded websocket-base v0.26.5
[INFO] [stderr]   Downloaded hyper v0.10.16
[INFO] [stderr]   Downloaded mech-core v0.2.75
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 7cf0c133b7af59e3fcf3b7d5d5a548572ef8b8f189105e0ce45db00d7e024acb
[INFO] running `Command { std: "docker" "start" "-a" "7cf0c133b7af59e3fcf3b7d5d5a548572ef8b8f189105e0ce45db00d7e024acb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7cf0c133b7af59e3fcf3b7d5d5a548572ef8b8f189105e0ce45db00d7e024acb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7cf0c133b7af59e3fcf3b7d5d5a548572ef8b8f189105e0ce45db00d7e024acb", kill_on_drop: false }`
[INFO] [stdout] 7cf0c133b7af59e3fcf3b7d5d5a548572ef8b8f189105e0ce45db00d7e024acb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 8abde6773ff654227e33c12cfb1a21ac778f7f53a7135c01106688d1ce672b6d
[INFO] running `Command { std: "docker" "start" "-a" "8abde6773ff654227e33c12cfb1a21ac778f7f53a7135c01106688d1ce672b6d", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v0.1.8
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]     Checking typenum v1.20.0
[INFO] [stderr]     Checking tinyvec v1.11.0
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]     Checking byte-tools v0.3.1
[INFO] [stderr]     Checking bytemuck v1.25.0
[INFO] [stderr]    Compiling unicase v1.4.2
[INFO] [stderr]     Checking block-padding v0.1.5
[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]     Checking rand_core v0.3.1
[INFO] [stderr]    Compiling proc-macro-error-attr2 v2.0.0
[INFO] [stderr]     Checking num-integer v0.1.46
[INFO] [stderr]     Checking safe_arch v0.7.4
[INFO] [stderr]    Compiling matrixmultiply v0.3.10
[INFO] [stderr]     Checking matches v0.1.10
[INFO] [stderr]     Checking unicode-bidi v0.3.18
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]     Checking alloc-no-stdlib v2.0.4
[INFO] [stderr]     Checking unicode-normalization v0.1.25
[INFO] [stderr]     Checking num-bigint v0.4.6
[INFO] [stderr]     Checking alloc-stdlib v0.2.2
[INFO] [stderr]    Compiling ahash v0.8.12
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]     Checking wide v0.7.33
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_jitter v0.1.4
[INFO] [stderr]     Checking idna v0.1.5
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking approx v0.5.1
[INFO] [stderr]    Compiling virtue v0.0.18
[INFO] [stderr]    Compiling crossbeam-utils v0.8.21
[INFO] [stderr]     Checking bytecount v0.6.9
[INFO] [stderr]     Checking generic-array v0.12.4
[INFO] [stderr]     Checking fake-simd v0.1.2
[INFO] [stderr]     Checking digest v0.8.1
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking percent-encoding v1.0.1
[INFO] [stderr]     Checking safemem v0.3.3
[INFO] [stderr]     Checking rawpointer v0.2.1
[INFO] [stderr]     Checking opaque-debug v0.2.3
[INFO] [stderr]     Checking base64 v0.9.3
[INFO] [stderr]     Checking sha-1 v0.8.2
[INFO] [stderr]     Checking papergrid v0.17.0
[INFO] [stderr]     Checking url v1.7.2
[INFO] [stderr]     Checking mime v0.2.6
[INFO] [stderr]     Checking brotli-decompressor v5.0.0
[INFO] [stderr]    Compiling bincode_derive v2.0.1
[INFO] [stderr]     Checking num-rational v0.4.2
[INFO] [stderr]     Checking testing_table v0.3.0
[INFO] [stderr]     Checking num_cpus v1.17.0
[INFO] [stderr]     Checking time v0.1.45
[INFO] [stderr]     Checking base64 v0.10.1
[INFO] [stderr]     Checking typeable v0.1.2
[INFO] [stderr]     Checking hashbrown v0.17.1
[INFO] [stderr]     Checking traitobject v0.1.1
[INFO] [stderr]     Checking once_cell v1.21.4
[INFO] [stderr]     Checking simba v0.9.1
[INFO] [stderr]     Checking unty v0.0.4
[INFO] [stderr]     Checking memchr v2.8.0
[INFO] [stderr]     Checking language-tags v0.2.2
[INFO] [stderr]     Checking brotli v8.0.2
[INFO] [stderr]     Checking websocket-base v0.26.5
[INFO] [stderr]     Checking hyper v0.10.16
[INFO] [stderr]     Checking serde_json v1.0.149
[INFO] [stderr]     Checking seahash v4.1.0
[INFO] [stderr]     Checking hashbrown v0.14.5
[INFO] [stderr]     Checking indexmap v2.14.0
[INFO] [stderr]     Checking crossbeam-channel v0.5.15
[INFO] [stderr]     Checking websocket v0.26.5
[INFO] [stderr]    Compiling proc-macro-error2 v2.0.1
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling nalgebra-macros v0.3.0
[INFO] [stderr]    Compiling tabled_derive v0.11.0
[INFO] [stderr]     Checking tabled v0.20.0
[INFO] [stderr]     Checking nalgebra v0.34.2
[INFO] [stderr]     Checking bincode v2.0.1
[INFO] [stderr]     Checking mech-core v0.2.75
[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/mech-core-0.2.75/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(get_mut_unchecked)]
[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 `mech-core` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "8abde6773ff654227e33c12cfb1a21ac778f7f53a7135c01106688d1ce672b6d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8abde6773ff654227e33c12cfb1a21ac778f7f53a7135c01106688d1ce672b6d", kill_on_drop: false }`
[INFO] [stdout] 8abde6773ff654227e33c12cfb1a21ac778f7f53a7135c01106688d1ce672b6d