[INFO] fetching crate exprz-core 0.0.6...
[INFO] testing exprz-core-0.0.6 against 1.54.0 for beta-1.55-1
[INFO] extracting crate exprz-core 0.0.6 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate exprz-core 0.0.6 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate exprz-core 0.0.6
[INFO] finished tweaking crates.io crate exprz-core 0.0.6
[INFO] tweaked toml for crates.io crate exprz-core 0.0.6 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fd542b0f12103f3e06f7c2a99c942e2084e2cee8440d437669bd7b9627a43224
[INFO] running `Command { std: "docker" "start" "-a" "fd542b0f12103f3e06f7c2a99c942e2084e2cee8440d437669bd7b9627a43224", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fd542b0f12103f3e06f7c2a99c942e2084e2cee8440d437669bd7b9627a43224", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd542b0f12103f3e06f7c2a99c942e2084e2cee8440d437669bd7b9627a43224", kill_on_drop: false }`
[INFO] [stdout] fd542b0f12103f3e06f7c2a99c942e2084e2cee8440d437669bd7b9627a43224
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e11a4aa597740e14b8e0dac4cddc8bc06202349e4154f791420c8b55aa35ab3f
[INFO] running `Command { std: "docker" "start" "-a" "e11a4aa597740e14b8e0dac4cddc8bc06202349e4154f791420c8b55aa35ab3f", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling exprz-core v0.0.6 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(generic_associated_types)]
[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 `exprz-core`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "e11a4aa597740e14b8e0dac4cddc8bc06202349e4154f791420c8b55aa35ab3f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e11a4aa597740e14b8e0dac4cddc8bc06202349e4154f791420c8b55aa35ab3f", kill_on_drop: false }`
[INFO] [stdout] e11a4aa597740e14b8e0dac4cddc8bc06202349e4154f791420c8b55aa35ab3f
