[INFO] fetching crate learner 0.9.0...
[INFO] testing learner-0.9.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate learner 0.9.0 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate learner 0.9.0
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate learner 0.9.0
[INFO] tweaked toml for crates.io crate learner 0.9.0 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate learner 0.9.0 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate learner 0.9.0 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" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tracing-test v0.2.5
[INFO] [stderr]   Downloaded tracing-test-macro v0.2.5
[INFO] [stderr]   Downloaded rustc-hash v2.0.0
[INFO] [stderr]   Downloaded async-trait v0.1.83
[INFO] [stderr]   Downloaded anyhow v1.0.93
[INFO] [stderr]   Downloaded rangemap v1.5.1
[INFO] [stderr]   Downloaded quinn v0.11.6
[INFO] [stderr]   Downloaded tinyvec v1.8.0
[INFO] [stderr]   Downloaded cc v1.2.1
[INFO] [stderr]   Downloaded serde_json v1.0.133
[INFO] [stderr]   Downloaded hyper v1.5.1
[INFO] [stderr]   Downloaded winnow v0.6.20
[INFO] [stderr]   Downloaded quick-xml v0.37.1
[INFO] [stderr]   Downloaded quinn-proto v0.11.9
[INFO] [stderr]   Downloaded hashbrown v0.15.1
[INFO] [stderr]   Downloaded quinn-udp v0.5.7
[INFO] [stderr]   Downloaded webpki-roots v0.26.7
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[INFO] [stderr]   Downloaded tokio v1.41.1
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[INFO] [stderr]   Downloaded lopdf v0.34.0
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dfd45de411a9288bd09de4ff8ab520e60164a505fbd14f9207a2859e86c4e32e
[INFO] running `Command { std: "docker" "start" "-a" "dfd45de411a9288bd09de4ff8ab520e60164a505fbd14f9207a2859e86c4e32e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dfd45de411a9288bd09de4ff8ab520e60164a505fbd14f9207a2859e86c4e32e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dfd45de411a9288bd09de4ff8ab520e60164a505fbd14f9207a2859e86c4e32e", kill_on_drop: false }`
[INFO] [stdout] dfd45de411a9288bd09de4ff8ab520e60164a505fbd14f9207a2859e86c4e32e
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fa6062972acea2660209aaa5925e19debeba1d15ff7ae60ef7b3ff1f3d611ac3
[INFO] running `Command { std: "docker" "start" "-a" "fa6062972acea2660209aaa5925e19debeba1d15ff7ae60ef7b3ff1f3d611ac3", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.92
[INFO] [stderr]    Compiling unicode-ident v1.0.14
[INFO] [stderr]    Compiling libc v0.2.164
[INFO] [stderr]    Compiling cc v1.2.1
[INFO] [stderr]    Compiling serde v1.0.215
[INFO] [stderr]    Compiling pin-project-lite v0.2.15
[INFO] [stderr]    Compiling itoa v1.0.13
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[INFO] [stderr]    Compiling crossbeam-utils v0.8.20
[INFO] [stderr]    Compiling futures-channel v0.3.31
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]    Compiling rustls-pki-types v1.10.0
[INFO] [stderr]    Compiling icu_locid_transform_data v1.5.0
[INFO] [stderr]    Compiling ahash v0.8.11
[INFO] [stderr]    Compiling icu_properties_data v1.5.0
[INFO] [stderr]    Compiling http v1.1.0
[INFO] [stderr]    Compiling httparse v1.9.5
[INFO] [stderr]    Compiling spin v0.9.8
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]    Compiling icu_normalizer_data v1.5.0
[INFO] [stderr]    Compiling syn v2.0.89
[INFO] [stderr]    Compiling signal-hook-registry v1.4.2
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[INFO] [stderr]    Compiling socket2 v0.5.7
[INFO] [stderr]    Compiling getrandom v0.2.15
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[INFO] [stderr]    Compiling ring v0.17.8
[INFO] [stderr]    Compiling http-body v1.0.1
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]    Compiling libsqlite3-sys v0.30.1
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[INFO] [stderr]    Compiling zeroize v1.8.1
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[INFO] [stderr]    Compiling equivalent v1.0.1
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[INFO] [stderr]    Compiling regex v1.11.1
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[INFO] [stderr]    Compiling serde_derive v1.0.215
[INFO] [stderr]    Compiling zerovec-derive v0.10.3
[INFO] [stderr]    Compiling displaydoc v0.2.5
[INFO] [stderr]    Compiling zerofrom v0.1.5
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[INFO] [stderr]    Compiling futures-macro v0.3.31
[INFO] [stderr]    Compiling tokio-macros v2.4.0
[INFO] [stderr]    Compiling tracing-attributes v0.1.27
[INFO] [stderr]    Compiling zerovec v0.10.4
[INFO] [stderr]    Compiling thiserror-impl v2.0.3
[INFO] [stderr]    Compiling tokio v1.41.1
[INFO] [stderr]    Compiling futures-util v0.3.31
[INFO] [stderr]    Compiling tinystr v0.7.6
[INFO] [stderr]    Compiling icu_locid v1.5.0
[INFO] [stderr]    Compiling icu_collections v1.5.0
[INFO] [stderr]    Compiling tracing v0.1.40
[INFO] [stderr]    Compiling async-trait v0.1.83
[INFO] [stderr]    Compiling icu_provider v1.5.0
[INFO] [stderr]    Compiling icu_locid_transform v1.5.0
[INFO] [stderr]    Compiling icu_properties v1.5.1
[INFO] [stderr]    Compiling futures-executor v0.3.31
[INFO] [stderr]    Compiling http-body-util v0.1.2
[INFO] [stderr]    Compiling futures v0.3.31
[INFO] [stderr]    Compiling hyper v1.5.1
[INFO] [stderr]    Compiling tokio-rustls v0.26.0
[INFO] [stderr]    Compiling chrono v0.4.38
[INFO] [stderr]    Compiling serde_spanned v0.6.8
[INFO] [stderr]    Compiling icu_normalizer v1.5.0
[INFO] [stderr]    Compiling toml_datetime v0.6.8
[INFO] [stderr]    Compiling serde_urlencoded v0.7.1
[INFO] [stderr]    Compiling toml_edit v0.22.22
[INFO] [stderr]    Compiling idna_adapter v1.2.0
[INFO] [stderr]    Compiling idna v1.0.3
[INFO] [stderr]    Compiling hyper-util v0.1.10
[INFO] [stderr]    Compiling quick-xml v0.37.1
[INFO] [stderr]    Compiling rusqlite v0.32.1
[INFO] [stderr]    Compiling hyper-rustls v0.27.3
[INFO] [stderr]    Compiling url v2.5.4
[INFO] [stderr]    Compiling lopdf v0.34.0
[INFO] [stderr]    Compiling tokio-rusqlite v0.6.0
[INFO] [stderr]    Compiling reqwest v0.12.9
[INFO] [stderr]    Compiling toml v0.8.19
[INFO] [stderr]    Compiling learner v0.9.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:148:1
[INFO] [stdout]     |
[INFO] [stdout] 148 | #![feature(str_from_utf16_endian)]
[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 `learner` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "fa6062972acea2660209aaa5925e19debeba1d15ff7ae60ef7b3ff1f3d611ac3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa6062972acea2660209aaa5925e19debeba1d15ff7ae60ef7b3ff1f3d611ac3", kill_on_drop: false }`
[INFO] [stdout] fa6062972acea2660209aaa5925e19debeba1d15ff7ae60ef7b3ff1f3d611ac3
