[INFO] fetching crate numerical-integration 0.0.1...
[INFO] checking numerical-integration-0.0.1 against 1.95.0 for pr-155915
[INFO] extracting crate numerical-integration 0.0.1 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate numerical-integration 0.0.1
[INFO] finished tweaking crates.io crate numerical-integration 0.0.1
[INFO] tweaked toml for crates.io crate numerical-integration 0.0.1 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate numerical-integration 0.0.1 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 numerical-integration 0.0.1 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 maths-traits v0.2.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 6c35c8c13e681e0d2466f97db955bb2a32ac07201522869823a64f9e9b3507b2
[INFO] running `Command { std: "docker" "start" "-a" "6c35c8c13e681e0d2466f97db955bb2a32ac07201522869823a64f9e9b3507b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6c35c8c13e681e0d2466f97db955bb2a32ac07201522869823a64f9e9b3507b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6c35c8c13e681e0d2466f97db955bb2a32ac07201522869823a64f9e9b3507b2", kill_on_drop: false }`
[INFO] [stdout] 6c35c8c13e681e0d2466f97db955bb2a32ac07201522869823a64f9e9b3507b2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 1c62e8590fc024a7885916342fe92dc36900e93ce677569c0ab9708fc1df3a5e
[INFO] running `Command { std: "docker" "start" "-a" "1c62e8590fc024a7885916342fe92dc36900e93ce677569c0ab9708fc1df3a5e", kill_on_drop: false }`
[INFO] [stderr]     Checking maths-traits v0.2.1
[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/maths-traits-0.2.1/src/lib.rs:317:1
[INFO] [stdout]     |
[INFO] [stdout] 317 | #![feature(trait_alias)]
[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 `maths-traits` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "1c62e8590fc024a7885916342fe92dc36900e93ce677569c0ab9708fc1df3a5e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1c62e8590fc024a7885916342fe92dc36900e93ce677569c0ab9708fc1df3a5e", kill_on_drop: false }`
[INFO] [stdout] 1c62e8590fc024a7885916342fe92dc36900e93ce677569c0ab9708fc1df3a5e