[INFO] fetching crate magc 0.1.1...
[INFO] documenting magc-0.1.1 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate magc 0.1.1 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate magc 0.1.1 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 magc 0.1.1
[INFO] finished tweaking crates.io crate magc 0.1.1
[INFO] tweaked toml for crates.io crate magc 0.1.1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[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]  Downloading crates ...
[INFO] [stderr]   Downloaded mortal v0.2.4
[INFO] [stderr]   Downloaded strontium v0.6.0
[INFO] [stderr]   Downloaded smallstr v0.2.0
[INFO] [stderr]   Downloaded linefeed v0.6.0
[INFO] [stderr]   Downloaded terminfo v0.8.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 3153544575f2056237d15525f5bbf5d987a694fbce030be492b11972b70d3cce
[INFO] running `Command { std: "docker" "start" "-a" "3153544575f2056237d15525f5bbf5d987a694fbce030be492b11972b70d3cce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3153544575f2056237d15525f5bbf5d987a694fbce030be492b11972b70d3cce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3153544575f2056237d15525f5bbf5d987a694fbce030be492b11972b70d3cce", kill_on_drop: false }`
[INFO] [stdout] 3153544575f2056237d15525f5bbf5d987a694fbce030be492b11972b70d3cce
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] fcc730545ab9616e2bd38c2a77005cae8a534e9e98235ad480920a770feb5ba7
[INFO] running `Command { std: "docker" "start" "-a" "fcc730545ab9616e2bd38c2a77005cae8a534e9e98235ad480920a770feb5ba7", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.76
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling siphasher v0.3.11
[INFO] [stderr]    Compiling thiserror v1.0.56
[INFO] [stderr]     Checking dirs-sys v0.3.7
[INFO] [stderr]     Checking minimal-lexical v0.2.1
[INFO] [stderr]    Compiling rustix v0.38.28
[INFO] [stderr]     Checking dirs v4.0.0
[INFO] [stderr]     Checking smallstr v0.2.0
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]     Checking nix v0.26.4
[INFO] [stderr]     Checking phf_shared v0.11.2
[INFO] [stderr]     Checking nom v7.1.3
[INFO] [stderr]    Compiling num-traits v0.2.17
[INFO] [stderr]     Checking phf v0.11.2
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]     Checking aho-corasick v1.1.2
[INFO] [stderr]     Checking unicode-width v0.1.11
[INFO] [stderr]     Checking linux-raw-sys v0.4.12
[INFO] [stderr]     Checking regex-syntax v0.8.2
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]    Compiling phf_generator v0.11.2
[INFO] [stderr]    Compiling phf_codegen v0.11.2
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling terminfo v0.8.0
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking dirs v1.0.5
[INFO] [stderr]     Checking ucd-trie v0.1.6
[INFO] [stderr]     Checking os_str_bytes v6.6.1
[INFO] [stderr]     Checking termcolor v1.4.0
[INFO] [stderr]     Checking regex-automata v0.4.3
[INFO] [stderr]     Checking clap_lex v0.2.4
[INFO] [stderr]     Checking is-terminal v0.4.10
[INFO] [stderr]     Checking colored v2.1.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking log v0.4.20
[INFO] [stderr]     Checking textwrap v0.16.0
[INFO] [stderr]     Checking hex v0.3.2
[INFO] [stderr]     Checking humantime v2.1.0
[INFO] [stderr]     Checking unicode-segmentation v1.10.1
[INFO] [stderr]    Compiling thiserror-impl v1.0.56
[INFO] [stderr]    Compiling serde_derive v1.0.195
[INFO] [stderr]    Compiling num-derive v0.4.1
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking regex v1.10.2
[INFO] [stderr]     Checking env_logger v0.10.1
[INFO] [stderr]    Compiling pest v2.7.6
[INFO] [stderr]     Checking mortal v0.2.4
[INFO] [stderr]    Compiling clap_derive v3.2.25
[INFO] [stderr]    Compiling pest_meta v2.7.6
[INFO] [stderr]     Checking linefeed v0.6.0
[INFO] [stderr]     Checking serde v1.0.195
[INFO] [stderr]    Compiling pest_generator v2.7.6
[INFO] [stderr]    Compiling pest_derive v2.7.6
[INFO] [stderr]     Checking clap v3.2.25
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking strontium v0.6.0
[INFO] [stderr]  Documenting magc v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:76:1
[INFO] [stdout]    |
[INFO] [stdout] 76 | #![feature(type_ascription)]
[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 `magc`
[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 lib --crate-name magc src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=945c679f56834f98 -L dependency=/opt/rustwide/target/debug/deps --extern clap=/opt/rustwide/target/debug/deps/libclap-9841cf3774771e69.rmeta --extern env_logger=/opt/rustwide/target/debug/deps/libenv_logger-ce7f1e7a4bd981d4.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-adcbaf8a98132d5a.rmeta --extern strontium=/opt/rustwide/target/debug/deps/libstrontium-cdb28f74e86ef976.rmeta --extern unicode_segmentation=/opt/rustwide/target/debug/deps/libunicode_segmentation-2dd8e02529dfdc3b.rmeta --cap-lints=warn --crate-version 0.1.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "fcc730545ab9616e2bd38c2a77005cae8a534e9e98235ad480920a770feb5ba7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fcc730545ab9616e2bd38c2a77005cae8a534e9e98235ad480920a770feb5ba7", kill_on_drop: false }`
[INFO] [stdout] fcc730545ab9616e2bd38c2a77005cae8a534e9e98235ad480920a770feb5ba7
