[INFO] fetching crate writedown-html 0.1.0...
[INFO] testing writedown-html-0.1.0 against 1.60.0 for beta-1.61-1
[INFO] extracting crate writedown-html 0.1.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate writedown-html 0.1.0 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate writedown-html 0.1.0
[INFO] finished tweaking crates.io crate writedown-html 0.1.0
[INFO] tweaked toml for crates.io crate writedown-html 0.1.0 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate crates.io crate writedown-html 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded libc v0.2.90
[INFO] [stderr]   Downloaded writedown v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f04f99e7a4bc5dfaab57e4756e97f9ded9b3d2f97a58f432169fa70c84ffe3cb
[INFO] running `Command { std: "docker" "start" "-a" "f04f99e7a4bc5dfaab57e4756e97f9ded9b3d2f97a58f432169fa70c84ffe3cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f04f99e7a4bc5dfaab57e4756e97f9ded9b3d2f97a58f432169fa70c84ffe3cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f04f99e7a4bc5dfaab57e4756e97f9ded9b3d2f97a58f432169fa70c84ffe3cb", kill_on_drop: false }`
[INFO] [stdout] f04f99e7a4bc5dfaab57e4756e97f9ded9b3d2f97a58f432169fa70c84ffe3cb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ed078e0eba66c4553d0329d9b84873c3601059656e69cb46a5408cfa2b5f2c36
[INFO] running `Command { std: "docker" "start" "-a" "ed078e0eba66c4553d0329d9b84873c3601059656e69cb46a5408cfa2b5f2c36", kill_on_drop: false }`
[INFO] [stderr]    Compiling writedown 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/github.com-1ecc6299db9ec823/writedown-0.1.0/src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(assert_matches)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `writedown` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "ed078e0eba66c4553d0329d9b84873c3601059656e69cb46a5408cfa2b5f2c36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ed078e0eba66c4553d0329d9b84873c3601059656e69cb46a5408cfa2b5f2c36", kill_on_drop: false }`
[INFO] [stdout] ed078e0eba66c4553d0329d9b84873c3601059656e69cb46a5408cfa2b5f2c36