[INFO] fetching crate rpni 0.1.1...
[INFO] testing rpni-0.1.1 against 1.90.0 for beta-1.91-3
[INFO] extracting crate rpni 0.1.1 into /workspace/builds/worker-6-tc1/source
[INFO] removed /workspace/builds/worker-6-tc1/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate rpni 0.1.1
[INFO] finished tweaking crates.io crate rpni 0.1.1
[INFO] tweaked toml for crates.io crate rpni 0.1.1 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate rpni 0.1.1 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 rpni 0.1.1 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 utf8-chars v1.0.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] c2e9eca03c70471962ef299300d08a33c04e767b2df42e4af1e19ebb81bcc397
[INFO] running `Command { std: "docker" "start" "-a" "c2e9eca03c70471962ef299300d08a33c04e767b2df42e4af1e19ebb81bcc397", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c2e9eca03c70471962ef299300d08a33c04e767b2df42e4af1e19ebb81bcc397", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c2e9eca03c70471962ef299300d08a33c04e767b2df42e4af1e19ebb81bcc397", kill_on_drop: false }`
[INFO] [stdout] c2e9eca03c70471962ef299300d08a33c04e767b2df42e4af1e19ebb81bcc397
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] f1c9b2b42c99c99eb6c8a510f67a5f3e0b0f0bda4522c6c038e5fef1b8e9d43e
[INFO] running `Command { std: "docker" "start" "-a" "f1c9b2b42c99c99eb6c8a510f67a5f3e0b0f0bda4522c6c038e5fef1b8e9d43e", kill_on_drop: false }`
[INFO] [stderr]    Compiling anyhow v1.0.53
[INFO] [stderr]    Compiling arrayvec v0.5.2
[INFO] [stderr]    Compiling utf8-chars v1.0.2
[INFO] [stderr]    Compiling rpni v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.50s
[INFO] running `Command { std: "docker" "inspect" "f1c9b2b42c99c99eb6c8a510f67a5f3e0b0f0bda4522c6c038e5fef1b8e9d43e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f1c9b2b42c99c99eb6c8a510f67a5f3e0b0f0bda4522c6c038e5fef1b8e9d43e", kill_on_drop: false }`
[INFO] [stdout] f1c9b2b42c99c99eb6c8a510f67a5f3e0b0f0bda4522c6c038e5fef1b8e9d43e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bda1f6c9ce15c398a1e0ca95c70a282b05d9442b994f0e2bd11f395ae89ab5f3
[INFO] running `Command { std: "docker" "start" "-a" "bda1f6c9ce15c398a1e0ca95c70a282b05d9442b994f0e2bd11f395ae89ab5f3", kill_on_drop: false }`
[INFO] [stderr]    Compiling rpni v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:19
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(test, feature(assert_matches))]
[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 `rpni` (bin "rpni" test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "bda1f6c9ce15c398a1e0ca95c70a282b05d9442b994f0e2bd11f395ae89ab5f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bda1f6c9ce15c398a1e0ca95c70a282b05d9442b994f0e2bd11f395ae89ab5f3", kill_on_drop: false }`
[INFO] [stdout] bda1f6c9ce15c398a1e0ca95c70a282b05d9442b994f0e2bd11f395ae89ab5f3