[INFO] fetching crate confer 0.1.12...
[INFO] testing confer-0.1.12 against 1.90.0 for beta-1.91-3
[INFO] extracting crate confer 0.1.12 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate confer 0.1.12
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate confer 0.1.12
[INFO] tweaked toml for crates.io crate confer 0.1.12 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate confer 0.1.12 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 confer 0.1.12 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 static_init_macro v1.0.4
[INFO] [stderr]   Downloaded loginit v0.1.18
[INFO] [stderr]   Downloaded const-str-proc-macro v0.7.0
[INFO] [stderr]   Downloaded const-str v0.7.0
[INFO] [stderr]   Downloaded aok v0.1.17
[INFO] [stderr]   Downloaded static_init v1.0.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] e9151d2e9a2a603ab425d487c9ddc74d5c8192354273a8088be07f5629f1d614
[INFO] running `Command { std: "docker" "start" "-a" "e9151d2e9a2a603ab425d487c9ddc74d5c8192354273a8088be07f5629f1d614", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e9151d2e9a2a603ab425d487c9ddc74d5c8192354273a8088be07f5629f1d614", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e9151d2e9a2a603ab425d487c9ddc74d5c8192354273a8088be07f5629f1d614", kill_on_drop: false }`
[INFO] [stdout] e9151d2e9a2a603ab425d487c9ddc74d5c8192354273a8088be07f5629f1d614
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] b61b8cfa4c42621b68aa45a87c252bd7f220b16a56979629c0f072e1a902a5d8
[INFO] running `Command { std: "docker" "start" "-a" "b61b8cfa4c42621b68aa45a87c252bd7f220b16a56979629c0f072e1a902a5d8", kill_on_drop: false }`
[INFO] [stderr]    Compiling quote v1.0.41
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling tracing-attributes v0.1.30
[INFO] [stderr]    Compiling tracing v0.1.41
[INFO] [stderr]    Compiling confer v0.1.12 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(doc_cfg)]
[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 `confer` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "b61b8cfa4c42621b68aa45a87c252bd7f220b16a56979629c0f072e1a902a5d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b61b8cfa4c42621b68aa45a87c252bd7f220b16a56979629c0f072e1a902a5d8", kill_on_drop: false }`
[INFO] [stdout] b61b8cfa4c42621b68aa45a87c252bd7f220b16a56979629c0f072e1a902a5d8