[INFO] fetching crate hypermangle-py 0.2.0...
[INFO] testing hypermangle-py-0.2.0 against 1.75.0 for beta-1.76-1
[INFO] extracting crate hypermangle-py 0.2.0 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate hypermangle-py 0.2.0 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate hypermangle-py 0.2.0
[INFO] finished tweaking crates.io crate hypermangle-py 0.2.0
[INFO] tweaked toml for crates.io crate hypermangle-py 0.2.0 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded pyo3-macros v0.19.2
[INFO] [stderr]   Downloaded axum-macros v0.3.8
[INFO] [stderr]   Downloaded pyo3-asyncio-macros v0.19.0
[INFO] [stderr]   Downloaded pyo3-macros-backend v0.19.2
[INFO] [stderr]   Downloaded pyo3-build-config v0.19.2
[INFO] [stderr]   Downloaded pyo3 v0.19.2
[INFO] [stderr]   Downloaded pyo3-ffi v0.19.2
[INFO] [stderr]   Downloaded pyo3-asyncio v0.19.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 530ba4f91239d6f3e06a5a3e3bfc2608d1c11f5a9a998955c14bf37ada0636d2
[INFO] running `Command { std: "docker" "start" "-a" "530ba4f91239d6f3e06a5a3e3bfc2608d1c11f5a9a998955c14bf37ada0636d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "530ba4f91239d6f3e06a5a3e3bfc2608d1c11f5a9a998955c14bf37ada0636d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "530ba4f91239d6f3e06a5a3e3bfc2608d1c11f5a9a998955c14bf37ada0636d2", kill_on_drop: false }`
[INFO] [stdout] 530ba4f91239d6f3e06a5a3e3bfc2608d1c11f5a9a998955c14bf37ada0636d2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 81271aa0e86993b658a441d53cb6f4d41099177ef41caa90c8f11fd70ce0a606
[INFO] running `Command { std: "docker" "start" "-a" "81271aa0e86993b658a441d53cb6f4d41099177ef41caa90c8f11fd70ce0a606", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.75
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling once_cell v1.19.0
[INFO] [stderr]    Compiling pin-project-lite v0.2.13
[INFO] [stderr]    Compiling target-lexicon v0.12.13
[INFO] [stderr]    Compiling futures-sink v0.3.30
[INFO] [stderr]    Compiling itoa v1.0.10
[INFO] [stderr]    Compiling bytes v1.5.0
[INFO] [stderr]    Compiling futures-core v0.3.30
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling futures-task v0.3.30
[INFO] [stderr]    Compiling futures-io v0.3.30
[INFO] [stderr]    Compiling slab v0.4.9
[INFO] [stderr]    Compiling memchr v2.7.1
[INFO] [stderr]    Compiling rustversion v1.0.14
[INFO] [stderr]    Compiling getrandom v0.2.11
[INFO] [stderr]    Compiling futures-channel v0.3.30
[INFO] [stderr]    Compiling socket2 v0.5.5
[INFO] [stderr]    Compiling mio v0.8.10
[INFO] [stderr]    Compiling log v0.4.20
[INFO] [stderr]    Compiling percent-encoding v2.3.1
[INFO] [stderr]    Compiling serde v1.0.194
[INFO] [stderr]    Compiling form_urlencoded v1.2.1
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling unicode-normalization v0.1.22
[INFO] [stderr]    Compiling http v0.2.11
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]    Compiling lock_api v0.4.11
[INFO] [stderr]    Compiling tokio v1.30.0
[INFO] [stderr]    Compiling unicode-bidi v0.3.14
[INFO] [stderr]    Compiling parking_lot_core v0.9.9
[INFO] [stderr]    Compiling thiserror v1.0.56
[INFO] [stderr]    Compiling ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling tracing-core v0.1.32
[INFO] [stderr]    Compiling memoffset v0.9.0
[INFO] [stderr]    Compiling async-trait v0.1.77
[INFO] [stderr]    Compiling pyo3-build-config v0.19.2
[INFO] [stderr]    Compiling scopeguard v1.2.0
[INFO] [stderr]    Compiling cpufeatures v0.2.12
[INFO] [stderr]    Compiling idna v0.5.0
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]    Compiling smallvec v1.11.2
[INFO] [stderr]    Compiling http-body v0.4.6
[INFO] [stderr]    Compiling tracing v0.1.40
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling axum-core v0.3.4
[INFO] [stderr]    Compiling try-lock v0.2.5
[INFO] [stderr]    Compiling byteorder v1.5.0
[INFO] [stderr]    Compiling url v2.5.0
[INFO] [stderr]    Compiling utf-8 v0.7.6
[INFO] [stderr]    Compiling tower-layer v0.3.2
[INFO] [stderr]    Compiling ryu v1.0.16
[INFO] [stderr]    Compiling data-encoding v2.5.0
[INFO] [stderr]    Compiling serde_json v1.0.111
[INFO] [stderr]    Compiling parking_lot v0.12.1
[INFO] [stderr]    Compiling block-buffer v0.10.4
[INFO] [stderr]    Compiling crypto-common v0.1.6
[INFO] [stderr]    Compiling want v0.3.1
[INFO] [stderr]    Compiling digest v0.10.7
[INFO] [stderr]    Compiling axum v0.6.20
[INFO] [stderr]    Compiling httpdate v1.0.3
[INFO] [stderr]    Compiling indoc v1.0.9
[INFO] [stderr]    Compiling unindent v0.1.11
[INFO] [stderr]    Compiling matchit v0.7.3
[INFO] [stderr]    Compiling base64 v0.21.5
[INFO] [stderr]    Compiling sha1 v0.10.6
[INFO] [stderr]    Compiling sync_wrapper v0.1.2
[INFO] [stderr]    Compiling pyo3-ffi v0.19.2
[INFO] [stderr]    Compiling pyo3 v0.19.2
[INFO] [stderr]    Compiling serde_path_to_error v0.1.15
[INFO] [stderr]    Compiling serde_urlencoded v0.7.1
[INFO] [stderr]    Compiling pyo3-macros-backend v0.19.2
[INFO] [stderr]    Compiling pyo3-asyncio-macros v0.19.0
[INFO] [stderr]    Compiling futures-macro v0.3.30
[INFO] [stderr]    Compiling thiserror-impl v1.0.56
[INFO] [stderr]    Compiling pin-project-internal v1.1.3
[INFO] [stderr]    Compiling axum-macros v0.3.8
[INFO] [stderr]    Compiling pyo3-macros v0.19.2
[INFO] [stderr]    Compiling futures-util v0.3.30
[INFO] [stderr]    Compiling tungstenite v0.20.1
[INFO] [stderr]    Compiling pin-project v1.1.3
[INFO] [stderr]    Compiling futures-executor v0.3.30
[INFO] [stderr]    Compiling tokio-tungstenite v0.20.1
[INFO] [stderr]    Compiling hyper v0.14.28
[INFO] [stderr]    Compiling tower v0.4.13
[INFO] [stderr]    Compiling futures v0.3.30
[INFO] [stderr]    Compiling pyo3-asyncio v0.19.0
[INFO] [stderr]    Compiling hypermangle-py v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(exclusive_wrapper)]
[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 `hypermangle-py` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "81271aa0e86993b658a441d53cb6f4d41099177ef41caa90c8f11fd70ce0a606", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "81271aa0e86993b658a441d53cb6f4d41099177ef41caa90c8f11fd70ce0a606", kill_on_drop: false }`
[INFO] [stdout] 81271aa0e86993b658a441d53cb6f4d41099177ef41caa90c8f11fd70ce0a606
[INFO] testing hypermangle-py-0.2.0 against beta-2023-12-22 for beta-1.76-1
[INFO] extracting crate hypermangle-py 0.2.0 into /workspace/builds/worker-5-tc2/source
[INFO] validating manifest of crates.io crate hypermangle-py 0.2.0 on toolchain beta-2023-12-22
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-12-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate hypermangle-py 0.2.0
[INFO] finished tweaking crates.io crate hypermangle-py 0.2.0
[INFO] tweaked toml for crates.io crate hypermangle-py 0.2.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-12-22" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-12-22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-12-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b935ca3cca437be90575bcd538e6ca8ac247a1c86b4a0574a3c08e26adc9e862
[INFO] running `Command { std: "docker" "start" "-a" "b935ca3cca437be90575bcd538e6ca8ac247a1c86b4a0574a3c08e26adc9e862", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b935ca3cca437be90575bcd538e6ca8ac247a1c86b4a0574a3c08e26adc9e862", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b935ca3cca437be90575bcd538e6ca8ac247a1c86b4a0574a3c08e26adc9e862", kill_on_drop: false }`
[INFO] [stdout] b935ca3cca437be90575bcd538e6ca8ac247a1c86b4a0574a3c08e26adc9e862
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-12-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 64bd564269f4f2a61dda6e5c7b32b946bdc457baa97e38965cc32c1db7fde985
[INFO] running `Command { std: "docker" "start" "-a" "64bd564269f4f2a61dda6e5c7b32b946bdc457baa97e38965cc32c1db7fde985", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.75
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling once_cell v1.19.0
[INFO] [stderr]    Compiling pin-project-lite v0.2.13
[INFO] [stderr]    Compiling target-lexicon v0.12.13
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]    Compiling itoa v1.0.10
[INFO] [stderr]    Compiling bytes v1.5.0
[INFO] [stderr]    Compiling futures-sink v0.3.30
[INFO] [stderr]    Compiling futures-core v0.3.30
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling memchr v2.7.1
[INFO] [stderr]    Compiling futures-io v0.3.30
[INFO] [stderr]    Compiling slab v0.4.9
[INFO] [stderr]    Compiling futures-task v0.3.30
[INFO] [stderr]    Compiling rustversion v1.0.14
[INFO] [stderr]    Compiling getrandom v0.2.11
[INFO] [stderr]    Compiling mio v0.8.10
[INFO] [stderr]    Compiling socket2 v0.5.5
[INFO] [stderr]    Compiling futures-channel v0.3.30
[INFO] [stderr]    Compiling percent-encoding v2.3.1
[INFO] [stderr]    Compiling serde v1.0.194
[INFO] [stderr]    Compiling log v0.4.20
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling unicode-normalization v0.1.22
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]    Compiling http v0.2.11
[INFO] [stderr]    Compiling tokio v1.30.0
[INFO] [stderr]    Compiling form_urlencoded v1.2.1
[INFO] [stderr]    Compiling lock_api v0.4.11
[INFO] [stderr]    Compiling parking_lot_core v0.9.9
[INFO] [stderr]    Compiling thiserror v1.0.56
[INFO] [stderr]    Compiling unicode-bidi v0.3.14
[INFO] [stderr]    Compiling ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling tracing-core v0.1.32
[INFO] [stderr]    Compiling memoffset v0.9.0
[INFO] [stderr]    Compiling async-trait v0.1.77
[INFO] [stderr]    Compiling cpufeatures v0.2.12
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling smallvec v1.11.2
[INFO] [stderr]    Compiling pyo3-build-config v0.19.2
[INFO] [stderr]    Compiling scopeguard v1.2.0
[INFO] [stderr]    Compiling idna v0.5.0
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling tracing v0.1.40
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling axum-core v0.3.4
[INFO] [stderr]    Compiling http-body v0.4.6
[INFO] [stderr]    Compiling url v2.5.0
[INFO] [stderr]    Compiling try-lock v0.2.5
[INFO] [stderr]    Compiling tower-layer v0.3.2
[INFO] [stderr]    Compiling ryu v1.0.16
[INFO] [stderr]    Compiling data-encoding v2.5.0
[INFO] [stderr]    Compiling utf-8 v0.7.6
[INFO] [stderr]    Compiling serde_json v1.0.111
[INFO] [stderr]    Compiling crypto-common v0.1.6
[INFO] [stderr]    Compiling block-buffer v0.10.4
[INFO] [stderr]    Compiling byteorder v1.5.0
[INFO] [stderr]    Compiling digest v0.10.7
[INFO] [stderr]    Compiling want v0.3.1
[INFO] [stderr]    Compiling parking_lot v0.12.1
[INFO] [stderr]    Compiling axum v0.6.20
[INFO] [stderr]    Compiling indoc v1.0.9
[INFO] [stderr]    Compiling httpdate v1.0.3
[INFO] [stderr]    Compiling unindent v0.1.11
[INFO] [stderr]    Compiling base64 v0.21.5
[INFO] [stderr]    Compiling sha1 v0.10.6
[INFO] [stderr]    Compiling matchit v0.7.3
[INFO] [stderr]    Compiling sync_wrapper v0.1.2
[INFO] [stderr]    Compiling pyo3-ffi v0.19.2
[INFO] [stderr]    Compiling pyo3 v0.19.2
[INFO] [stderr]    Compiling serde_urlencoded v0.7.1
[INFO] [stderr]    Compiling serde_path_to_error v0.1.15
[INFO] [stderr]    Compiling pyo3-macros-backend v0.19.2
[INFO] [stderr]    Compiling futures-macro v0.3.30
[INFO] [stderr]    Compiling thiserror-impl v1.0.56
[INFO] [stderr]    Compiling pin-project-internal v1.1.3
[INFO] [stderr]    Compiling axum-macros v0.3.8
[INFO] [stderr]    Compiling pyo3-asyncio-macros v0.19.0
[INFO] [stderr]    Compiling futures-util v0.3.30
[INFO] [stderr]    Compiling pin-project v1.1.3
[INFO] [stderr]    Compiling tungstenite v0.20.1
[INFO] [stderr]    Compiling pyo3-macros v0.19.2
[INFO] [stderr]    Compiling futures-executor v0.3.30
[INFO] [stderr]    Compiling hyper v0.14.28
[INFO] [stderr]    Compiling tower v0.4.13
[INFO] [stderr]    Compiling tokio-tungstenite v0.20.1
[INFO] [stderr]    Compiling futures v0.3.30
[INFO] [stderr]    Compiling pyo3-asyncio v0.19.0
[INFO] [stderr]    Compiling hypermangle-py v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(exclusive_wrapper)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 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 `hypermangle-py` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "64bd564269f4f2a61dda6e5c7b32b946bdc457baa97e38965cc32c1db7fde985", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "64bd564269f4f2a61dda6e5c7b32b946bdc457baa97e38965cc32c1db7fde985", kill_on_drop: false }`
[INFO] [stdout] 64bd564269f4f2a61dda6e5c7b32b946bdc457baa97e38965cc32c1db7fde985
