[INFO] fetching crate exprtk_rs 0.1.0...
[INFO] checking exprtk_rs-0.1.0 against 1.55.0 for beta-1.56-3
[INFO] extracting crate exprtk_rs 0.1.0 into /workspace/builds/worker-30/source
[INFO] validating manifest of crates.io crate exprtk_rs 0.1.0 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate exprtk_rs 0.1.0
[INFO] finished tweaking crates.io crate exprtk_rs 0.1.0
[INFO] tweaked toml for crates.io crate exprtk_rs 0.1.0 written to /workspace/builds/worker-30/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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 exprtk_sys v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 37a0e918f3f8c5f608a2a7f7db6d3b9fe01e3ef5ca7420496b5c749689cf0fd4
[INFO] running `Command { std: "docker" "start" "-a" "37a0e918f3f8c5f608a2a7f7db6d3b9fe01e3ef5ca7420496b5c749689cf0fd4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "37a0e918f3f8c5f608a2a7f7db6d3b9fe01e3ef5ca7420496b5c749689cf0fd4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "37a0e918f3f8c5f608a2a7f7db6d3b9fe01e3ef5ca7420496b5c749689cf0fd4", kill_on_drop: false }`
[INFO] [stdout] 37a0e918f3f8c5f608a2a7f7db6d3b9fe01e3ef5ca7420496b5c749689cf0fd4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2e747e0fdb7fa28f1c9ff8da10bfb58f675208a01614bd38a75208052cf4bce9
[INFO] running `Command { std: "docker" "start" "-a" "2e747e0fdb7fa28f1c9ff8da10bfb58f675208a01614bd38a75208052cf4bce9", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling libc v0.2.103
[INFO] [stderr]    Compiling cc v1.0.71
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling exprtk_sys v0.1.0
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking approx v0.4.0
[INFO] [stderr]     Checking enum_primitive v0.1.1
[INFO] [stderr]     Checking exprtk_rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> benches/benches.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[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 `exprtk_rs` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "2e747e0fdb7fa28f1c9ff8da10bfb58f675208a01614bd38a75208052cf4bce9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2e747e0fdb7fa28f1c9ff8da10bfb58f675208a01614bd38a75208052cf4bce9", kill_on_drop: false }`
[INFO] [stdout] 2e747e0fdb7fa28f1c9ff8da10bfb58f675208a01614bd38a75208052cf4bce9
