[INFO] fetching crate numscale 0.2.0...
[INFO] checking numscale-0.2.0 against 1.95.0 for pr-155915
[INFO] extracting crate numscale 0.2.0 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate numscale 0.2.0
[INFO] finished tweaking crates.io crate numscale 0.2.0
[INFO] tweaked toml for crates.io crate numscale 0.2.0 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate numscale 0.2.0 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 numscale 0.2.0 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] cd55dbd93993ac4bc0c4960f708f2867c666d16f8a27809fd8380f9f8366c399
[INFO] running `Command { std: "docker" "start" "-a" "cd55dbd93993ac4bc0c4960f708f2867c666d16f8a27809fd8380f9f8366c399", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cd55dbd93993ac4bc0c4960f708f2867c666d16f8a27809fd8380f9f8366c399", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd55dbd93993ac4bc0c4960f708f2867c666d16f8a27809fd8380f9f8366c399", kill_on_drop: false }`
[INFO] [stdout] cd55dbd93993ac4bc0c4960f708f2867c666d16f8a27809fd8380f9f8366c399
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 28ec7c22f89d78ae298509fdc2dcdff56e2d38f5e4c9a22c90f2a3ef937a07d1
[INFO] running `Command { std: "docker" "start" "-a" "28ec7c22f89d78ae298509fdc2dcdff56e2d38f5e4c9a22c90f2a3ef937a07d1", kill_on_drop: false }`
[INFO] [stderr]     Checking numscale v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(const_trait_impl)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `numscale` (lib) due to 1 previous error
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(const_trait_impl)]
[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 `numscale` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "28ec7c22f89d78ae298509fdc2dcdff56e2d38f5e4c9a22c90f2a3ef937a07d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "28ec7c22f89d78ae298509fdc2dcdff56e2d38f5e4c9a22c90f2a3ef937a07d1", kill_on_drop: false }`
[INFO] [stdout] 28ec7c22f89d78ae298509fdc2dcdff56e2d38f5e4c9a22c90f2a3ef937a07d1
