[INFO] fetching crate sylvan_number 0.1.5...
[INFO] testing sylvan_number-0.1.5 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate sylvan_number 0.1.5 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate sylvan_number 0.1.5
[INFO] finished tweaking crates.io crate sylvan_number 0.1.5
[INFO] tweaked toml for crates.io crate sylvan_number 0.1.5 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate sylvan_number 0.1.5 on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "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-2025-09-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 23 packages to latest compatible versions
[INFO] [stderr]       Adding rand v0.8.5 (available: v0.9.2)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6823f9fcea90384d30e13695ce1f525f3a127e3c0174a09d3965688d225eb4ea
[INFO] running `Command { std: "docker" "start" "-a" "6823f9fcea90384d30e13695ce1f525f3a127e3c0174a09d3965688d225eb4ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6823f9fcea90384d30e13695ce1f525f3a127e3c0174a09d3965688d225eb4ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6823f9fcea90384d30e13695ce1f525f3a127e3c0174a09d3965688d225eb4ea", kill_on_drop: false }`
[INFO] [stdout] 6823f9fcea90384d30e13695ce1f525f3a127e3c0174a09d3965688d225eb4ea
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ea363592c91217bd84f03f16fe86fad2fc75adf7a0d81186b1f98a566b00be0f
[INFO] running `Command { std: "docker" "start" "-a" "ea363592c91217bd84f03f16fe86fad2fc75adf7a0d81186b1f98a566b00be0f", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling getrandom v0.2.16
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling num-integer v0.1.46
[INFO] [stderr]    Compiling num-complex v0.4.6
[INFO] [stderr]    Compiling num-bigint v0.4.6
[INFO] [stderr]    Compiling num-iter v0.1.45
[INFO] [stderr]    Compiling num-rational v0.4.2
[INFO] [stderr]    Compiling num v0.4.3
[INFO] [stderr]    Compiling algebra_kit v0.1.15
[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/algebra_kit-0.1.15/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(min_specialization)]
[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 `algebra_kit` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "ea363592c91217bd84f03f16fe86fad2fc75adf7a0d81186b1f98a566b00be0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ea363592c91217bd84f03f16fe86fad2fc75adf7a0d81186b1f98a566b00be0f", kill_on_drop: false }`
[INFO] [stdout] ea363592c91217bd84f03f16fe86fad2fc75adf7a0d81186b1f98a566b00be0f