[INFO] cloning repository https://github.com/ProgramCrafter/dequemap
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ProgramCrafter/dequemap" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FProgramCrafter%2Fdequemap", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FProgramCrafter%2Fdequemap'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4f19807f4d50e0efee6b3c1aa693718e0ff4beaa
[INFO] testing ProgramCrafter/dequemap against 1.86.0 for beta-1.87-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FProgramCrafter%2Fdequemap" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ProgramCrafter/dequemap on toolchain 1.86.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.86.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ProgramCrafter/dequemap
[INFO] finished tweaking git repo https://github.com/ProgramCrafter/dequemap
[INFO] tweaked toml for git repo https://github.com/ProgramCrafter/dequemap written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/ProgramCrafter/dequemap 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" "+1.86.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ftree v1.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+1.86.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 13cd408b2b03160e8cf839af3257cef8ea5f9e1d1438b1d6f920acacb5423c85
[INFO] running `Command { std: "docker" "start" "-a" "13cd408b2b03160e8cf839af3257cef8ea5f9e1d1438b1d6f920acacb5423c85", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "13cd408b2b03160e8cf839af3257cef8ea5f9e1d1438b1d6f920acacb5423c85", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "13cd408b2b03160e8cf839af3257cef8ea5f9e1d1438b1d6f920acacb5423c85", kill_on_drop: false }`
[INFO] [stdout] 13cd408b2b03160e8cf839af3257cef8ea5f9e1d1438b1d6f920acacb5423c85
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+1.86.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5cd09746c51b7f40ad4ada3925f4de7b177c3957c13c7b7e8ab25cb795d5a55e
[INFO] running `Command { std: "docker" "start" "-a" "5cd09746c51b7f40ad4ada3925f4de7b177c3957c13c7b7e8ab25cb795d5a55e", kill_on_drop: false }`
[INFO] [stderr]    Compiling ftree v1.2.0
[INFO] [stderr]    Compiling liquemap v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0658]: use of unstable library feature `extract_if`: recently added
[INFO] [stdout]    --> src/grok.rs:277:45
[INFO] [stdout]     |
[INFO] [stdout] 277 |         self.sublists.extend(other.sublists.extract_if(.., |sl| !sl.is_empty()));
[INFO] [stdout]     |                                             ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #43244 <https://github.com/rust-lang/rust/issues/43244> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0658`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `liquemap` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "5cd09746c51b7f40ad4ada3925f4de7b177c3957c13c7b7e8ab25cb795d5a55e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5cd09746c51b7f40ad4ada3925f4de7b177c3957c13c7b7e8ab25cb795d5a55e", kill_on_drop: false }`
[INFO] [stdout] 5cd09746c51b7f40ad4ada3925f4de7b177c3957c13c7b7e8ab25cb795d5a55e