[INFO] fetching crate lexerus 0.1.8...
[INFO] testing lexerus-0.1.8 against 1.90.0 for beta-1.91-3
[INFO] extracting crate lexerus 0.1.8 into /workspace/builds/worker-5-tc1/source
[INFO] removed /workspace/builds/worker-5-tc1/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate lexerus 0.1.8
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate lexerus 0.1.8
[INFO] tweaked toml for crates.io crate lexerus 0.1.8 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate lexerus 0.1.8 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 lexerus 0.1.8 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 lexerus_derive v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] de8435ec11a9c2f8eaa20f9c7f60627a2b6390395586fb6ed8726c96ff599eb1
[INFO] running `Command { std: "docker" "start" "-a" "de8435ec11a9c2f8eaa20f9c7f60627a2b6390395586fb6ed8726c96ff599eb1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "de8435ec11a9c2f8eaa20f9c7f60627a2b6390395586fb6ed8726c96ff599eb1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de8435ec11a9c2f8eaa20f9c7f60627a2b6390395586fb6ed8726c96ff599eb1", kill_on_drop: false }`
[INFO] [stdout] de8435ec11a9c2f8eaa20f9c7f60627a2b6390395586fb6ed8726c96ff599eb1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] bdc58225b69ed870d99b15ac98a368f8d1e6e3cf598fcc03ac0ef188b4bc301b
[INFO] running `Command { std: "docker" "start" "-a" "bdc58225b69ed870d99b15ac98a368f8d1e6e3cf598fcc03ac0ef188b4bc301b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.86
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling quote v1.0.36
[INFO] [stderr]    Compiling syn v2.0.75
[INFO] [stderr]    Compiling lexerus_derive v0.1.0
[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/lexerus_derive-0.1.0/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(iter_intersperse)]
[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 `lexerus_derive` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "bdc58225b69ed870d99b15ac98a368f8d1e6e3cf598fcc03ac0ef188b4bc301b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bdc58225b69ed870d99b15ac98a368f8d1e6e3cf598fcc03ac0ef188b4bc301b", kill_on_drop: false }`
[INFO] [stdout] bdc58225b69ed870d99b15ac98a368f8d1e6e3cf598fcc03ac0ef188b4bc301b