[INFO] fetching crate grades 0.2.0...
[INFO] documenting grades-0.2.0 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate grades 0.2.0 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate grades 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 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-1-tc1/source/Cargo.toml
[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" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded xdg v2.5.0
[INFO] [stderr]   Downloaded serde_yaml v0.9.21
[INFO] [stderr]   Downloaded pretty_assertions v1.3.0
[INFO] [stderr]   Downloaded unsafe-libyaml v0.2.8
[INFO] [stderr]   Downloaded serde_derive v1.0.162
[INFO] [stderr]   Downloaded fraction v0.13.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 89b17f888ce5f8d7050870380f1ee794b7b2caca4c2dcbd62997452d9c753a04
[INFO] running `Command { std: "docker" "start" "-a" "89b17f888ce5f8d7050870380f1ee794b7b2caca4c2dcbd62997452d9c753a04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "89b17f888ce5f8d7050870380f1ee794b7b2caca4c2dcbd62997452d9c753a04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "89b17f888ce5f8d7050870380f1ee794b7b2caca4c2dcbd62997452d9c753a04", kill_on_drop: false }`
[INFO] [stdout] 89b17f888ce5f8d7050870380f1ee794b7b2caca4c2dcbd62997452d9c753a04
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 632c6a9a5e785dbab5e99a506bee1e7d2591e713faca1ea146b4fd4acaa095e3
[INFO] running `Command { std: "docker" "start" "-a" "632c6a9a5e785dbab5e99a506bee1e7d2591e713faca1ea146b4fd4acaa095e3", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.56
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling quote v1.0.27
[INFO] [stderr]    Compiling libc v0.2.144
[INFO] [stderr]    Compiling num-integer v0.1.45
[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]     Checking linux-raw-sys v0.3.7
[INFO] [stderr]    Compiling serde_derive v1.0.162
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]    Compiling num-rational v0.4.1
[INFO] [stderr]     Checking utf8parse v0.2.1
[INFO] [stderr]    Compiling serde v1.0.162
[INFO] [stderr]     Checking anstyle-parse v0.2.0
[INFO] [stderr]     Checking anstyle v1.0.0
[INFO] [stderr]     Checking colorchoice v1.0.0
[INFO] [stderr]     Checking anstyle-query v1.0.0
[INFO] [stderr]     Checking clap_lex v0.4.1
[INFO] [stderr]    Compiling heck v0.4.1
[INFO] [stderr]     Checking indexmap v1.9.3
[INFO] [stderr]     Checking diff v0.1.13
[INFO] [stderr]    Compiling syn v2.0.15
[INFO] [stderr]     Checking ryu v1.0.13
[INFO] [stderr]     Checking yansi v0.5.1
[INFO] [stderr]     Checking itoa v1.0.6
[INFO] [stderr]     Checking num-complex v0.4.3
[INFO] [stderr]     Checking home v0.5.5
[INFO] [stderr]     Checking unsafe-libyaml v0.2.8
[INFO] [stderr]     Checking pretty_assertions v1.3.0
[INFO] [stderr]     Checking xdg v2.5.0
[INFO] [stderr]     Checking is-terminal v0.4.7
[INFO] [stderr]     Checking anstream v0.3.2
[INFO] [stderr]     Checking num v0.4.0
[INFO] [stderr]     Checking clap_builder v4.2.7
[INFO] [stderr]     Checking fraction v0.13.1
[INFO] [stderr]    Compiling clap_derive v4.2.0
[INFO] [stderr]     Checking clap v4.2.7
[INFO] [stderr]     Checking serde_yaml v0.9.21
[INFO] [stderr]     Checking ron v0.8.0
[INFO] [stderr]  Documenting grades v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_group_by)]
[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 document `grades`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/bin/rustdoc --edition=2021 --crate-type bin --crate-name grades src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=abc96938a41a2793 -L dependency=/opt/rustwide/target/debug/deps --extern clap=/opt/rustwide/target/debug/deps/libclap-fd7e5f44a0ca8e6f.rmeta --extern fraction=/opt/rustwide/target/debug/deps/libfraction-9561ea27b44f57ab.rmeta --extern pretty_assertions=/opt/rustwide/target/debug/deps/libpretty_assertions-d29f17d9b87d0a08.rmeta --extern ron=/opt/rustwide/target/debug/deps/libron-901a3d6f3a6c13b7.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-3b37224075759014.rmeta --extern serde_yaml=/opt/rustwide/target/debug/deps/libserde_yaml-cfd39f89c34622ae.rmeta --extern xdg=/opt/rustwide/target/debug/deps/libxdg-e0f781afc2eb5e31.rmeta --cap-lints=warn --crate-version 0.2.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "632c6a9a5e785dbab5e99a506bee1e7d2591e713faca1ea146b4fd4acaa095e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "632c6a9a5e785dbab5e99a506bee1e7d2591e713faca1ea146b4fd4acaa095e3", kill_on_drop: false }`
[INFO] [stdout] 632c6a9a5e785dbab5e99a506bee1e7d2591e713faca1ea146b4fd4acaa095e3
[INFO] documenting grades-0.2.0 against beta-2023-12-22 for beta-1.76-rustdoc-1
[INFO] extracting crate grades 0.2.0 into /workspace/builds/worker-1-tc2/source
[INFO] validating manifest of crates.io crate grades 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 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-1-tc2/source/Cargo.toml
[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-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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 8b0235e1e4feacbd68c6e17598d9e503633088f3d901890dcff749ffe40db710
[INFO] running `Command { std: "docker" "start" "-a" "8b0235e1e4feacbd68c6e17598d9e503633088f3d901890dcff749ffe40db710", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8b0235e1e4feacbd68c6e17598d9e503633088f3d901890dcff749ffe40db710", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b0235e1e4feacbd68c6e17598d9e503633088f3d901890dcff749ffe40db710", kill_on_drop: false }`
[INFO] [stdout] 8b0235e1e4feacbd68c6e17598d9e503633088f3d901890dcff749ffe40db710
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4c8d74795b59117e6ffcecf6c447b9b2ebdc6520b28abd1047294b386526a3f0
[INFO] running `Command { std: "docker" "start" "-a" "4c8d74795b59117e6ffcecf6c447b9b2ebdc6520b28abd1047294b386526a3f0", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.56
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling quote v1.0.27
[INFO] [stderr]    Compiling libc v0.2.144
[INFO] [stderr]    Compiling num-integer v0.1.45
[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]     Checking linux-raw-sys v0.3.7
[INFO] [stderr]    Compiling serde_derive v1.0.162
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]    Compiling num-rational v0.4.1
[INFO] [stderr]     Checking utf8parse v0.2.1
[INFO] [stderr]    Compiling serde v1.0.162
[INFO] [stderr]     Checking anstyle-parse v0.2.0
[INFO] [stderr]     Checking anstyle-query v1.0.0
[INFO] [stderr]     Checking anstyle v1.0.0
[INFO] [stderr]     Checking colorchoice v1.0.0
[INFO] [stderr]     Checking clap_lex v0.4.1
[INFO] [stderr]    Compiling heck v0.4.1
[INFO] [stderr]     Checking indexmap v1.9.3
[INFO] [stderr]     Checking ryu v1.0.13
[INFO] [stderr]     Checking diff v0.1.13
[INFO] [stderr]     Checking home v0.5.5
[INFO] [stderr]     Checking yansi v0.5.1
[INFO] [stderr]     Checking unsafe-libyaml v0.2.8
[INFO] [stderr]    Compiling syn v2.0.15
[INFO] [stderr]     Checking itoa v1.0.6
[INFO] [stderr]     Checking pretty_assertions v1.3.0
[INFO] [stderr]     Checking xdg v2.5.0
[INFO] [stderr]     Checking num-complex v0.4.3
[INFO] [stderr]     Checking is-terminal v0.4.7
[INFO] [stderr]     Checking anstream v0.3.2
[INFO] [stderr]     Checking num v0.4.0
[INFO] [stderr]     Checking clap_builder v4.2.7
[INFO] [stderr]     Checking fraction v0.13.1
[INFO] [stderr]    Compiling clap_derive v4.2.0
[INFO] [stderr]     Checking clap v4.2.7
[INFO] [stderr]     Checking serde_yaml v0.9.21
[INFO] [stderr]     Checking ron v0.8.0
[INFO] [stderr]  Documenting 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:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_group_by)]
[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 document `grades`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/beta-2023-12-22-x86_64-unknown-linux-gnu/bin/rustdoc --edition=2021 --crate-type bin --crate-name grades src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=7a1216f3728c278d -L dependency=/opt/rustwide/target/debug/deps --extern clap=/opt/rustwide/target/debug/deps/libclap-5b226e287c1e1b54.rmeta --extern fraction=/opt/rustwide/target/debug/deps/libfraction-0100f3f75e303d01.rmeta --extern pretty_assertions=/opt/rustwide/target/debug/deps/libpretty_assertions-37799873a07a49c4.rmeta --extern ron=/opt/rustwide/target/debug/deps/libron-44ed8a7084affa01.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-f3d40aa4152bab2d.rmeta --extern serde_yaml=/opt/rustwide/target/debug/deps/libserde_yaml-2e9a50e2a3e19f2f.rmeta --extern xdg=/opt/rustwide/target/debug/deps/libxdg-74ebdc1cfc5d3fc4.rmeta --cap-lints=warn --crate-version 0.2.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "4c8d74795b59117e6ffcecf6c447b9b2ebdc6520b28abd1047294b386526a3f0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c8d74795b59117e6ffcecf6c447b9b2ebdc6520b28abd1047294b386526a3f0", kill_on_drop: false }`
[INFO] [stdout] 4c8d74795b59117e6ffcecf6c447b9b2ebdc6520b28abd1047294b386526a3f0
