[INFO] fetching crate learnerd 0.3.5...
[INFO] checking learnerd-0.3.5 against 1.95.0 for pr-155915
[INFO] extracting crate learnerd 0.3.5 into /workspace/builds/worker-3-tc1/source
[INFO] started tweaking crates.io crate learnerd 0.3.5
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate learnerd 0.3.5
[INFO] tweaked toml for crates.io crate learnerd 0.3.5 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate learnerd 0.3.5 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate learnerd 0.3.5 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" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3464c76c12caa78e6524fafd6b554b616c7d1ad93445d3f2bfb11c3587c8f296
[INFO] running `Command { std: "docker" "start" "-a" "3464c76c12caa78e6524fafd6b554b616c7d1ad93445d3f2bfb11c3587c8f296", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3464c76c12caa78e6524fafd6b554b616c7d1ad93445d3f2bfb11c3587c8f296", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3464c76c12caa78e6524fafd6b554b616c7d1ad93445d3f2bfb11c3587c8f296", kill_on_drop: false }`
[INFO] [stdout] 3464c76c12caa78e6524fafd6b554b616c7d1ad93445d3f2bfb11c3587c8f296
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3ec41b2610818eac89e49b240f3706604c7ed10c5de88276b1054d5ce00e19f1
[INFO] running `Command { std: "docker" "start" "-a" "3ec41b2610818eac89e49b240f3706604c7ed10c5de88276b1054d5ce00e19f1", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.92
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[INFO] [stderr]    Compiling thiserror-impl v1.0.69
[INFO] [stderr]    Compiling thiserror-impl v2.0.3
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[INFO] [stderr]     Checking futures-util v0.3.31
[INFO] [stderr]     Checking zerovec v0.10.4
[INFO] [stderr]     Checking tracing v0.1.40
[INFO] [stderr]    Compiling clap_derive v4.5.18
[INFO] [stderr]     Checking thiserror v1.0.69
[INFO] [stderr]     Checking tracing-subscriber v0.3.18
[INFO] [stderr]    Compiling async-trait v0.1.83
[INFO] [stderr]     Checking tinystr v0.7.6
[INFO] [stderr]     Checking icu_locid v1.5.0
[INFO] [stderr]     Checking icu_collections v1.5.0
[INFO] [stderr]     Checking icu_provider v1.5.0
[INFO] [stderr]     Checking dialoguer v0.11.0
[INFO] [stderr]     Checking icu_locid_transform v1.5.0
[INFO] [stderr]     Checking clap v4.5.21
[INFO] [stderr]    Compiling serial_test_derive v3.2.0
[INFO] [stderr]     Checking clap_complete v4.5.38
[INFO] [stderr]     Checking tracing-appender v0.2.3
[INFO] [stderr]     Checking icu_properties v1.5.1
[INFO] [stderr]     Checking futures-executor v0.3.31
[INFO] [stderr]     Checking http-body-util v0.1.2
[INFO] [stderr]     Checking futures v0.3.31
[INFO] [stderr]     Checking serial_test v3.2.0
[INFO] [stderr]     Checking icu_normalizer v1.5.0
[INFO] [stderr]     Checking idna_adapter v1.2.0
[INFO] [stderr]     Checking idna v1.0.3
[INFO] [stderr]     Checking hyper v1.5.1
[INFO] [stderr]     Checking tokio-rustls v0.26.0
[INFO] [stderr]     Checking url v2.5.4
[INFO] [stderr]     Checking chrono v0.4.38
[INFO] [stderr]     Checking toml_datetime v0.6.8
[INFO] [stderr]     Checking serde_spanned v0.6.8
[INFO] [stderr]     Checking serde_urlencoded v0.7.1
[INFO] [stderr]     Checking quick-xml v0.37.1
[INFO] [stderr]     Checking toml_edit v0.22.22
[INFO] [stderr]     Checking hyper-util v0.1.10
[INFO] [stderr]     Checking rusqlite v0.32.1
[INFO] [stderr]     Checking lopdf v0.34.0
[INFO] [stderr]     Checking hyper-rustls v0.27.3
[INFO] [stderr]     Checking reqwest v0.12.9
[INFO] [stderr]     Checking toml v0.8.19
[INFO] [stderr]     Checking tokio-rusqlite v0.6.0
[INFO] [stderr]     Checking learner v0.8.6
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/learner-0.8.6/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" "3ec41b2610818eac89e49b240f3706604c7ed10c5de88276b1054d5ce00e19f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3ec41b2610818eac89e49b240f3706604c7ed10c5de88276b1054d5ce00e19f1", kill_on_drop: false }`
[INFO] [stdout] 3ec41b2610818eac89e49b240f3706604c7ed10c5de88276b1054d5ce00e19f1