[INFO] fetching crate radix50-cli 0.2.1...
[INFO] testing radix50-cli-0.2.1 against 1.90.0 for beta-1.91-3
[INFO] extracting crate radix50-cli 0.2.1 into /workspace/builds/worker-5-tc1/source
[INFO] started tweaking crates.io crate radix50-cli 0.2.1
[INFO] finished tweaking crates.io crate radix50-cli 0.2.1
[INFO] tweaked toml for crates.io crate radix50-cli 0.2.1 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate radix50-cli 0.2.1 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 radix50-cli 0.2.1 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 assert_cmd v2.0.14
[INFO] [stderr]   Downloaded const_for v0.1.2
[INFO] [stderr]   Downloaded predicates v3.1.0
[INFO] [stderr]   Downloaded radix50 v0.2.1
[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] 2844d4d5ba7454802e770d290a93df96fff5c29a2812c616b7a717b401d9da14
[INFO] running `Command { std: "docker" "start" "-a" "2844d4d5ba7454802e770d290a93df96fff5c29a2812c616b7a717b401d9da14", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2844d4d5ba7454802e770d290a93df96fff5c29a2812c616b7a717b401d9da14", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2844d4d5ba7454802e770d290a93df96fff5c29a2812c616b7a717b401d9da14", kill_on_drop: false }`
[INFO] [stdout] 2844d4d5ba7454802e770d290a93df96fff5c29a2812c616b7a717b401d9da14
[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] 03ee0162be8e0b407a1bdea01bca02c7d79fb19fc85b08ad298bba7064f0e13d
[INFO] running `Command { std: "docker" "start" "-a" "03ee0162be8e0b407a1bdea01bca02c7d79fb19fc85b08ad298bba7064f0e13d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.67
[INFO] [stderr]    Compiling serde v1.0.188
[INFO] [stderr]    Compiling regex-syntax v0.7.5
[INFO] [stderr]    Compiling const_for v0.1.2
[INFO] [stderr]    Compiling radix50 v0.2.1
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]    Compiling syn v2.0.37
[INFO] [stderr]    Compiling regex-automata v0.3.8
[INFO] [stderr]    Compiling serde_derive v1.0.188
[INFO] [stderr]    Compiling regex v1.9.5
[INFO] [stderr]    Compiling docopt v1.1.1
[INFO] [stderr]    Compiling radix50-cli v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> radix50-cli.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![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 `radix50-cli` (bin "radix50") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "03ee0162be8e0b407a1bdea01bca02c7d79fb19fc85b08ad298bba7064f0e13d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "03ee0162be8e0b407a1bdea01bca02c7d79fb19fc85b08ad298bba7064f0e13d", kill_on_drop: false }`
[INFO] [stdout] 03ee0162be8e0b407a1bdea01bca02c7d79fb19fc85b08ad298bba7064f0e13d
