[INFO] fetching crate grades 0.2.0...
[INFO] testing grades-0.2.0 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate grades 0.2.0 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate grades 0.2.0
[INFO] finished tweaking crates.io crate grades 0.2.0
[INFO] tweaked toml for crates.io crate grades 0.2.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate grades 0.2.0 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] crate crates.io crate grades 0.2.0 already has a lockfile, it will not be regenerated
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 553ca15c6938c218cb2972d6d2d4bd9151e8de1caae0e4fbcbfba8f4477fabc0
[INFO] running `Command { std: "docker" "start" "-a" "553ca15c6938c218cb2972d6d2d4bd9151e8de1caae0e4fbcbfba8f4477fabc0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "553ca15c6938c218cb2972d6d2d4bd9151e8de1caae0e4fbcbfba8f4477fabc0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "553ca15c6938c218cb2972d6d2d4bd9151e8de1caae0e4fbcbfba8f4477fabc0", kill_on_drop: false }`
[INFO] [stdout] 553ca15c6938c218cb2972d6d2d4bd9151e8de1caae0e4fbcbfba8f4477fabc0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 99d003a33c273818b801fc96305d1b4700683bf0b3b9f289cdcf883977d927ad
[INFO] running `Command { std: "docker" "start" "-a" "99d003a33c273818b801fc96305d1b4700683bf0b3b9f289cdcf883977d927ad", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.56
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling unicode-ident v1.0.8
[INFO] [stderr]    Compiling quote v1.0.27
[INFO] [stderr]    Compiling libc v0.2.144
[INFO] [stderr]    Compiling io-lifetimes v1.0.10
[INFO] [stderr]    Compiling rustix v0.37.19
[INFO] [stderr]    Compiling num-bigint v0.4.3
[INFO] [stderr]    Compiling linux-raw-sys v0.3.7
[INFO] [stderr]    Compiling serde_derive v1.0.162
[INFO] [stderr]    Compiling serde v1.0.162
[INFO] [stderr]    Compiling anstyle-parse v0.2.0
[INFO] [stderr]    Compiling anstyle v1.0.0
[INFO] [stderr]    Compiling clap_lex v0.4.1
[INFO] [stderr]    Compiling home v0.5.5
[INFO] [stderr]    Compiling itoa v1.0.6
[INFO] [stderr]    Compiling ryu v1.0.13
[INFO] [stderr]    Compiling yansi v0.5.1
[INFO] [stderr]    Compiling once_cell v1.17.1
[INFO] [stderr]    Compiling unsafe-libyaml v0.2.8
[INFO] [stderr]    Compiling xdg v2.5.0
[INFO] [stderr]    Compiling pretty_assertions v1.3.0
[INFO] [stderr]    Compiling syn v2.0.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling num-complex v0.4.3
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]    Compiling num-rational v0.4.1
[INFO] [stderr]    Compiling num v0.4.0
[INFO] [stderr]    Compiling fraction v0.13.1
[INFO] [stderr]    Compiling is-terminal v0.4.7
[INFO] [stderr]    Compiling anstream v0.3.2
[INFO] [stderr]    Compiling clap_builder v4.2.7
[INFO] [stderr]    Compiling clap_derive v4.2.0
[INFO] [stderr]    Compiling clap v4.2.7
[INFO] [stderr]    Compiling serde_yaml v0.9.21
[INFO] [stderr]    Compiling ron v0.8.0
[INFO] [stderr]    Compiling grades v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_group_by)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `slice_group_by` has been stable since 1.77.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_group_by)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `group_by` found for slice `[GradeAverage]` in the current scope
[INFO] [stdout]    --> src/subcommands/list/average.rs:105:14
[INFO] [stdout]     |
[INFO] [stdout] 104 | /         averages[..]
[INFO] [stdout] 105 | |             .group_by(|x, y| x.grade_type.group == y.grade_type.group)
[INFO] [stdout]     | |             -^^^^^^^^ method not found in `[GradeAverage]`
[INFO] [stdout]     | |_____________|
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `group_by` found for slice `[&Grade]` in the current scope
[INFO] [stdout]    --> src/subcommands/list.rs:185:10
[INFO] [stdout]     |
[INFO] [stdout] 184 |       match all_grades[..]
[INFO] [stdout]     |  ___________-
[INFO] [stdout] 185 | |         .group_by(|grade1, grade2| grade1.value == grade2.value)
[INFO] [stdout]     | |         -^^^^^^^^ method not found in `[&Grade]`
[INFO] [stdout]     | |_________|
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `grades` (bin "grades") due to 3 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "99d003a33c273818b801fc96305d1b4700683bf0b3b9f289cdcf883977d927ad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "99d003a33c273818b801fc96305d1b4700683bf0b3b9f289cdcf883977d927ad", kill_on_drop: false }`
[INFO] [stdout] 99d003a33c273818b801fc96305d1b4700683bf0b3b9f289cdcf883977d927ad