[INFO] fetching crate cova-space 0.2.3...
[INFO] checking cova-space-0.2.3 against 1.95.0 for pr-155915
[INFO] extracting crate cova-space 0.2.3 into /workspace/builds/worker-3-tc1/source
[INFO] started tweaking crates.io crate cova-space 0.2.3
[INFO] finished tweaking crates.io crate cova-space 0.2.3
[INFO] tweaked toml for crates.io crate cova-space 0.2.3 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate cova-space 0.2.3 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate cova-space 0.2.3 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" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded cova-algebra v0.2.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6c8c779d45f0ac3e1c67df81213cdf5716336536cf43f6710b9ab7e9f97ef8f2
[INFO] running `Command { std: "docker" "start" "-a" "6c8c779d45f0ac3e1c67df81213cdf5716336536cf43f6710b9ab7e9f97ef8f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6c8c779d45f0ac3e1c67df81213cdf5716336536cf43f6710b9ab7e9f97ef8f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6c8c779d45f0ac3e1c67df81213cdf5716336536cf43f6710b9ab7e9f97ef8f2", kill_on_drop: false }`
[INFO] [stdout] 6c8c779d45f0ac3e1c67df81213cdf5716336536cf43f6710b9ab7e9f97ef8f2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4d9bc21ce3243b158559ec5c294f221c07d79cbd3c611059395d5d0ed91a96b0
[INFO] running `Command { std: "docker" "start" "-a" "4d9bc21ce3243b158559ec5c294f221c07d79cbd3c611059395d5d0ed91a96b0", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.182
[INFO] [stderr]     Checking itertools v0.14.0
[INFO] [stderr]     Checking num-complex v0.4.6
[INFO] [stderr]     Checking approx v0.5.1
[INFO] [stderr]     Checking num-rational v0.4.2
[INFO] [stderr]     Checking simba v0.9.1
[INFO] [stderr]     Checking getrandom v0.4.1
[INFO] [stderr]     Checking tempfile v3.26.0
[INFO] [stderr]     Checking nalgebra v0.34.1
[INFO] [stderr]     Checking cova-algebra v0.2.2
[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/cova-algebra-0.2.2/src/lib.rs:43:1
[INFO] [stdout]    |
[INFO] [stdout] 43 | #![feature(generic_const_exprs)]
[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 `cova-algebra` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "4d9bc21ce3243b158559ec5c294f221c07d79cbd3c611059395d5d0ed91a96b0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4d9bc21ce3243b158559ec5c294f221c07d79cbd3c611059395d5d0ed91a96b0", kill_on_drop: false }`
[INFO] [stdout] 4d9bc21ce3243b158559ec5c294f221c07d79cbd3c611059395d5d0ed91a96b0