[INFO] fetching crate hid-io-protocol 0.1.6...
[INFO] testing hid-io-protocol-0.1.6 against 1.99.0-beta.8+cargoflags=--release for beta-release-1.100-2
[INFO] extracting crate hid-io-protocol 0.1.6 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate hid-io-protocol 0.1.6
[INFO] finished tweaking crates.io crate hid-io-protocol 0.1.6
[INFO] tweaked toml for crates.io crate hid-io-protocol 0.1.6 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate hid-io-protocol 0.1.6 on toolchain 1.99.0-beta.8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "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" "+1.99.0-beta.8" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 86 packages to highest compatible versions
[INFO] [stderr]       Adding defmt v0.3.101 (available: v1.2.0)
[INFO] [stderr]       Adding flexi_logger v0.25.6 (available: v0.31.10)
[INFO] [stderr]       Adding heapless v0.7.17 (available: v0.9.3)
[INFO] [stderr]       Adding num_enum v0.5.11 (available: v0.7.6)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded kll-core v0.1.8
[INFO] [stderr]   Downloaded kll-hid v0.1.2
[INFO] [stderr]   Downloaded kll-macros v0.1.2
[INFO] [stderr]   Downloaded defmt v0.3.101
[INFO] [stderr]   Downloaded defmt v1.2.0
[INFO] [stderr]   Downloaded enum-primitive-derive v0.2.2
[INFO] [stderr]   Downloaded defmt-parser v1.1.0
[INFO] [stderr]   Downloaded nu-ansi-term v0.49.0
[INFO] [stderr]   Downloaded defmt-macros v1.2.0
[INFO] [stderr]   Downloaded flexi_logger v0.25.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:77db811e55d90add9212f6832c23229e3de5f1c1f9905e8cb07319ea15df73ac" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] a40e9b72006f2dfd2a91884b1cf9d5074f46a397d1404a3cf81641192a34fbf0
[INFO] running `Command { std: "docker" "start" "a40e9b72006f2dfd2a91884b1cf9d5074f46a397d1404a3cf81641192a34fbf0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a40e9b72006f2dfd2a91884b1cf9d5074f46a397d1404a3cf81641192a34fbf0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "a40e9b72006f2dfd2a91884b1cf9d5074f46a397d1404a3cf81641192a34fbf0" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a40e9b72006f2dfd2a91884b1cf9d5074f46a397d1404a3cf81641192a34fbf0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "a40e9b72006f2dfd2a91884b1cf9d5074f46a397d1404a3cf81641192a34fbf0" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "build" "--frozen" "--message-format=json" "--release", kill_on_drop: false }`
[INFO] [stderr]    Compiling kll-macros v0.1.2
[INFO] [stderr]    Compiling kll-hid v0.1.2
[INFO] [stderr]    Compiling hash32 v0.2.1
[INFO] [stderr]    Compiling heapless v0.7.17
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling spin v0.9.9
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling enum-primitive-derive v0.2.2
[INFO] [stderr]    Compiling num_enum_derive v0.5.11
[INFO] [stderr]    Compiling kll-core v0.1.8
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/kll-core-0.1.8/src/layout/mod.rs:322:79
[INFO] [stdout]     |
[INFO] [stdout] 322 |         let layer_guides = if capability_state != CapabilityEvent::Initial && let Some((layer, _layer_state)) = cache_hit {
[INFO] [stdout]     |                                                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/kll-core-0.1.8/src/lib.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | #![feature(let_chains)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `let_chains` has been stable since `1.88.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling num_enum v0.5.11
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `kll-core` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "a40e9b72006f2dfd2a91884b1cf9d5074f46a397d1404a3cf81641192a34fbf0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a40e9b72006f2dfd2a91884b1cf9d5074f46a397d1404a3cf81641192a34fbf0", kill_on_drop: false }`
[INFO] [stdout] a40e9b72006f2dfd2a91884b1cf9d5074f46a397d1404a3cf81641192a34fbf0
