[INFO] fetching crate prefixes 0.1.0...
[INFO] testing prefixes-0.1.0 against 1.91.0 for beta-1.92-2
[INFO] extracting crate prefixes 0.1.0 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate prefixes 0.1.0
[INFO] finished tweaking crates.io crate prefixes 0.1.0
[INFO] tweaked toml for crates.io crate prefixes 0.1.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate prefixes 0.1.0 on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 18 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded prefixes-p v0.1.0
[INFO] [stderr]   Downloaded prefixes-re v0.1.0
[INFO] [stderr]   Downloaded prefixes-ms v0.1.0
[INFO] [stderr]   Downloaded prefixes-os v0.1.0
[INFO] [stderr]   Downloaded prefixes-uppercase-re v0.1.0
[INFO] [stderr]   Downloaded prefixes-s v0.1.0
[INFO] [stderr]   Downloaded prefixes-f v0.1.0
[INFO] [stderr]   Downloaded prefixes-uppercase-p v0.1.0
[INFO] [stderr]   Downloaded prefixes-uppercase-os v0.1.0
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3c3490bc687c334217f3edcf59e4b64e8f0865f097ee35ada09b1347f46dfcca
[INFO] running `Command { std: "docker" "start" "-a" "3c3490bc687c334217f3edcf59e4b64e8f0865f097ee35ada09b1347f46dfcca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3c3490bc687c334217f3edcf59e4b64e8f0865f097ee35ada09b1347f46dfcca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c3490bc687c334217f3edcf59e4b64e8f0865f097ee35ada09b1347f46dfcca", kill_on_drop: false }`
[INFO] [stdout] 3c3490bc687c334217f3edcf59e4b64e8f0865f097ee35ada09b1347f46dfcca
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9846737232f1959a0af2c9ed81f92d9a4e748a1137a25294cb59d9b52848850b
[INFO] running `Command { std: "docker" "start" "-a" "9846737232f1959a0af2c9ed81f92d9a4e748a1137a25294cb59d9b52848850b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.103
[INFO] [stderr]    Compiling quote v1.0.41
[INFO] [stderr]    Compiling syn v2.0.108
[INFO] [stderr]    Compiling prefixes-f v0.1.0
[INFO] [stderr]    Compiling prefixes-uppercase-os v0.1.0
[INFO] [stderr]    Compiling prefixes-uppercase-re v0.1.0
[INFO] [stderr]    Compiling prefixes-ms v0.1.0
[INFO] [stderr]    Compiling prefixes-os v0.1.0
[INFO] [stderr]    Compiling prefixes-p v0.1.0
[INFO] [stderr]    Compiling prefixes-re v0.1.0
[INFO] [stderr]    Compiling prefixes-uppercase-p v0.1.0
[INFO] [stderr]    Compiling prefixes-s v0.1.0
[INFO] [stderr]    Compiling prefixes v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_hygiene)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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(stmt_expr_attributes)]
[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 `prefixes` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "9846737232f1959a0af2c9ed81f92d9a4e748a1137a25294cb59d9b52848850b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9846737232f1959a0af2c9ed81f92d9a4e748a1137a25294cb59d9b52848850b", kill_on_drop: false }`
[INFO] [stdout] 9846737232f1959a0af2c9ed81f92d9a4e748a1137a25294cb59d9b52848850b