[INFO] fetching crate writedown-html 0.1.0...
[INFO] testing writedown-html-0.1.0 against 1.91.0 for beta-1.92-2
[INFO] extracting crate writedown-html 0.1.0 into /workspace/builds/worker-1-tc1/source
[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-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate writedown-html 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] crate crates.io crate writedown-html 0.1.0 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" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded writedown v0.1.0
[INFO] [stderr]   Downloaded libc v0.2.90
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 74dae0bbd410227fc49ed0dcb712ca63697fa7a54e4dbdd130c9871cbafc774d
[INFO] running `Command { std: "docker" "start" "-a" "74dae0bbd410227fc49ed0dcb712ca63697fa7a54e4dbdd130c9871cbafc774d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "74dae0bbd410227fc49ed0dcb712ca63697fa7a54e4dbdd130c9871cbafc774d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "74dae0bbd410227fc49ed0dcb712ca63697fa7a54e4dbdd130c9871cbafc774d", kill_on_drop: false }`
[INFO] [stdout] 74dae0bbd410227fc49ed0dcb712ca63697fa7a54e4dbdd130c9871cbafc774d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] b9551fd6e75e99eda4a6150029e8c00bfbba5f50d4daf6bb7e1495fe75910779
[INFO] running `Command { std: "docker" "start" "-a" "b9551fd6e75e99eda4a6150029e8c00bfbba5f50d4daf6bb7e1495fe75910779", 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/index.crates.io-1949cf8c6b5b557f/writedown-0.1.0/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![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 `writedown` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "b9551fd6e75e99eda4a6150029e8c00bfbba5f50d4daf6bb7e1495fe75910779", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b9551fd6e75e99eda4a6150029e8c00bfbba5f50d4daf6bb7e1495fe75910779", kill_on_drop: false }`
[INFO] [stdout] b9551fd6e75e99eda4a6150029e8c00bfbba5f50d4daf6bb7e1495fe75910779