[INFO] fetching crate pywavers 0.1.1...
[INFO] testing pywavers-0.1.1 against 1.91.0 for beta-1.92-2
[INFO] extracting crate pywavers 0.1.1 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate pywavers 0.1.1
[INFO] finished tweaking crates.io crate pywavers 0.1.1
[INFO] tweaked toml for crates.io crate pywavers 0.1.1 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate pywavers 0.1.1 on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "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" "+1.91.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 34 packages to latest compatible versions
[INFO] [stderr]       Adding ndarray v0.15.6 (available: v0.17.1)
[INFO] [stderr]       Adding numpy v0.18.0 (available: v0.27.0)
[INFO] [stderr]       Adding pyo3 v0.18.3 (available: v0.27.1)
[INFO] [stderr]       Adding wavers v0.1.1 (available: v1.5.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded pyo3-macros-backend v0.18.3
[INFO] [stderr]   Downloaded pyo3-macros v0.18.3
[INFO] [stderr]   Downloaded indoc v1.0.9
[INFO] [stderr]   Downloaded pyo3-build-config v0.18.3
[INFO] [stderr]   Downloaded numpy v0.18.0
[INFO] [stderr]   Downloaded pyo3-ffi v0.18.3
[INFO] [stderr]   Downloaded wavers v0.1.1
[INFO] [stderr]   Downloaded pyo3 v0.18.3
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 56b2d680d7b6698e35b12bacdd356f5a95e4c0c7553783d93c374a29e8bd1cbf
[INFO] running `Command { std: "docker" "start" "-a" "56b2d680d7b6698e35b12bacdd356f5a95e4c0c7553783d93c374a29e8bd1cbf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "56b2d680d7b6698e35b12bacdd356f5a95e4c0c7553783d93c374a29e8bd1cbf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "56b2d680d7b6698e35b12bacdd356f5a95e4c0c7553783d93c374a29e8bd1cbf", kill_on_drop: false }`
[INFO] [stdout] 56b2d680d7b6698e35b12bacdd356f5a95e4c0c7553783d93c374a29e8bd1cbf
[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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a458c7fab147c1c043b1c398d4bc0dd9763ef966725004e0eeee2d5a4277bf7b
[INFO] running `Command { std: "docker" "start" "-a" "a458c7fab147c1c043b1c398d4bc0dd9763ef966725004e0eeee2d5a4277bf7b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.103
[INFO] [stderr]    Compiling once_cell v1.21.3
[INFO] [stderr]    Compiling matrixmultiply v0.3.10
[INFO] [stderr]    Compiling memoffset v0.8.0
[INFO] [stderr]    Compiling indoc v1.0.9
[INFO] [stderr]    Compiling pyo3-build-config v0.18.3
[INFO] [stderr]    Compiling parking_lot_core v0.9.12
[INFO] [stderr]    Compiling num-complex v0.4.6
[INFO] [stderr]    Compiling num-integer v0.1.46
[INFO] [stderr]    Compiling parking_lot v0.12.5
[INFO] [stderr]    Compiling ndarray v0.15.6
[INFO] [stderr]    Compiling quote v1.0.41
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling pyo3-ffi v0.18.3
[INFO] [stderr]    Compiling pyo3 v0.18.3
[INFO] [stderr]    Compiling pyo3-macros-backend v0.18.3
[INFO] [stderr]    Compiling pyo3-macros v0.18.3
[INFO] [stderr]    Compiling numpy v0.18.0
[INFO] [stderr]    Compiling wavers v0.1.1
[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/wavers-0.1.1/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_as_chunks)]
[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 `wavers` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "a458c7fab147c1c043b1c398d4bc0dd9763ef966725004e0eeee2d5a4277bf7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a458c7fab147c1c043b1c398d4bc0dd9763ef966725004e0eeee2d5a4277bf7b", kill_on_drop: false }`
[INFO] [stdout] a458c7fab147c1c043b1c398d4bc0dd9763ef966725004e0eeee2d5a4277bf7b