[INFO] fetching crate r3_port_riscv 0.3.1...
[INFO] testing r3_port_riscv-0.3.1 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate r3_port_riscv 0.3.1 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate r3_port_riscv 0.3.1
[INFO] finished tweaking crates.io crate r3_port_riscv 0.3.1
[INFO] tweaked toml for crates.io crate r3_port_riscv 0.3.1 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate r3_port_riscv 0.3.1 on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "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" "+beta-2026-04-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 107 packages to latest compatible versions
[INFO] [stderr]       Adding riscv v0.7.0 (available: v0.16.0)
[INFO] [stderr]       Adding riscv-rt v0.8.1 (available: v0.17.1)
[INFO] [stderr]       Adding svgbob v0.6.6 (available: v0.6.7)
[INFO] [stderr]       Adding tock-registers v0.7.0 (available: v0.10.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3d91107cc621eb460e41048f297697a16e508a677d02719a24f1debaa8ef3acd
[INFO] running `Command { std: "docker" "start" "-a" "3d91107cc621eb460e41048f297697a16e508a677d02719a24f1debaa8ef3acd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3d91107cc621eb460e41048f297697a16e508a677d02719a24f1debaa8ef3acd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3d91107cc621eb460e41048f297697a16e508a677d02719a24f1debaa8ef3acd", kill_on_drop: false }`
[INFO] [stdout] 3d91107cc621eb460e41048f297697a16e508a677d02719a24f1debaa8ef3acd
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 950930d7da8a1f39e0df4b79d5b712564133e4955a23135170db6320b9dccc41
[INFO] running `Command { std: "docker" "start" "-a" "950930d7da8a1f39e0df4b79d5b712564133e4955a23135170db6320b9dccc41", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling regex-syntax v0.8.10
[INFO] [stderr]    Compiling unicode-width v0.1.14
[INFO] [stderr]    Compiling base64 v0.13.1
[INFO] [stderr]    Compiling elain v0.3.1
[INFO] [stderr]    Compiling aho-corasick v1.1.4
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling bare-metal v1.0.0
[INFO] [stderr]    Compiling tokenlock v0.3.8
[INFO] [stderr]    Compiling macro_find_and_replace v1.0.0
[INFO] [stderr]    Compiling tock-registers v0.7.0
[INFO] [stderr]    Compiling unstringify v0.1.4
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]    Compiling num-integer v0.1.46
[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/tock-registers-0.7.0/src/lib.rs:56:1
[INFO] [stdout]    |
[INFO] [stdout] 56 | #![feature(const_fn_trait_bound)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]    |
[INFO] [stdout]    = help: the feature `const_fn_trait_bound` has been stable since `1.61.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tock-registers` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "950930d7da8a1f39e0df4b79d5b712564133e4955a23135170db6320b9dccc41", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "950930d7da8a1f39e0df4b79d5b712564133e4955a23135170db6320b9dccc41", kill_on_drop: false }`
[INFO] [stdout] 950930d7da8a1f39e0df4b79d5b712564133e4955a23135170db6320b9dccc41
