[INFO] fetching crate nibblecode 0.1.0...
[INFO] checking nibblecode-0.1.0 against 1.95.0 for pr-155915
[INFO] extracting crate nibblecode 0.1.0 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate nibblecode 0.1.0
[INFO] finished tweaking crates.io crate nibblecode 0.1.0
[INFO] tweaked toml for crates.io crate nibblecode 0.1.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate nibblecode 0.1.0 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 nibblecode 0.1.0 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] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded nibblecode_derive v0.1.0
[INFO] [stderr]   Downloaded syn v2.0.102
[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] f888f3aee3ead196eaa34eaeaf5c248e2795f008371dd937c00ffd12270e55a3
[INFO] running `Command { std: "docker" "start" "-a" "f888f3aee3ead196eaa34eaeaf5c248e2795f008371dd937c00ffd12270e55a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f888f3aee3ead196eaa34eaeaf5c248e2795f008371dd937c00ffd12270e55a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f888f3aee3ead196eaa34eaeaf5c248e2795f008371dd937c00ffd12270e55a3", kill_on_drop: false }`
[INFO] [stdout] f888f3aee3ead196eaa34eaeaf5c248e2795f008371dd937c00ffd12270e55a3
[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] c87d59bcf51fa1859d5772326a73988e2ea1d5efbb2340ce6f12bc0eff692aec
[INFO] running `Command { std: "docker" "start" "-a" "c87d59bcf51fa1859d5772326a73988e2ea1d5efbb2340ce6f12bc0eff692aec", kill_on_drop: false }`
[INFO] [stderr]     Checking rend v0.5.2
[INFO] [stderr]    Compiling syn v2.0.102
[INFO] [stderr]    Compiling nibblecode_derive v0.1.0
[INFO] [stderr]     Checking nibblecode v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | / #![feature(
[INFO] [stdout] 2 | |     allocator_api,
[INFO] [stdout] 3 | |     maybe_uninit_slice,
[INFO] [stdout] 4 | |     offset_of_enum,
[INFO] [stdout] 5 | |     ptr_alignment_type,
[INFO] [stdout] 6 | |     ptr_metadata
[INFO] [stdout] 7 | | )]
[INFO] [stdout]   | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `maybe_uninit_slice` has been stable since 1.93.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:3:2
[INFO] [stdout]   |
[INFO] [stdout] 3 |     maybe_uninit_slice,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | / #![feature(
[INFO] [stdout] 2 | |     allocator_api,
[INFO] [stdout] 3 | |     maybe_uninit_slice,
[INFO] [stdout] 4 | |     offset_of_enum,
[INFO] [stdout] 5 | |     ptr_alignment_type,
[INFO] [stdout] 6 | |     ptr_metadata
[INFO] [stdout] 7 | | )]
[INFO] [stdout]   | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `maybe_uninit_slice` has been stable since 1.93.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:3:2
[INFO] [stdout]   |
[INFO] [stdout] 3 |     maybe_uninit_slice,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `nibblecode` (lib) due to 1 previous error; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `nibblecode` (lib test) due to 1 previous error; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "c87d59bcf51fa1859d5772326a73988e2ea1d5efbb2340ce6f12bc0eff692aec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c87d59bcf51fa1859d5772326a73988e2ea1d5efbb2340ce6f12bc0eff692aec", kill_on_drop: false }`
[INFO] [stdout] c87d59bcf51fa1859d5772326a73988e2ea1d5efbb2340ce6f12bc0eff692aec
