[INFO] fetching crate whippyunits 0.1.2...
[INFO] checking whippyunits-0.1.2 against 1.95.0 for pr-155915
[INFO] extracting crate whippyunits 0.1.2 into /workspace/builds/worker-3-tc1/source
[INFO] removed /workspace/builds/worker-3-tc1/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate whippyunits 0.1.2
[INFO] removed 0 missing examples
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate whippyunits 0.1.2
[INFO] tweaked toml for crates.io crate whippyunits 0.1.2 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate whippyunits 0.1.2 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 whippyunits 0.1.2 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 trybuild v1.0.112
[INFO] [stderr]   Downloaded whippyunits-core v0.1.0
[INFO] [stderr]   Downloaded whippyunits-proc-macros v0.1.0
[INFO] [stderr]   Downloaded op_result v0.5.8
[INFO] [stderr]   Downloaded litrs v0.5.1
[INFO] [stderr]   Downloaded proc-macro2 v1.0.102
[INFO] [stderr]   Downloaded culit v0.6.0
[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] 2ac2a199f771b17373122510819ced4471e76afb97db0884a898b8a476c198d0
[INFO] running `Command { std: "docker" "start" "-a" "2ac2a199f771b17373122510819ced4471e76afb97db0884a898b8a476c198d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2ac2a199f771b17373122510819ced4471e76afb97db0884a898b8a476c198d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ac2a199f771b17373122510819ced4471e76afb97db0884a898b8a476c198d0", kill_on_drop: false }`
[INFO] [stdout] 2ac2a199f771b17373122510819ced4471e76afb97db0884a898b8a476c198d0
[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] 64996d6a98c196f3d4b3af9a9e418433b32cdfb12fb5cdb14cadd2b48983ae58
[INFO] running `Command { std: "docker" "start" "-a" "64996d6a98c196f3d4b3af9a9e418433b32cdfb12fb5cdb14cadd2b48983ae58", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.102
[INFO] [stderr]    Compiling quote v1.0.41
[INFO] [stderr]    Compiling unicode-ident v1.0.20
[INFO] [stderr]    Compiling serde_json v1.0.145
[INFO] [stderr]    Compiling target-triple v0.1.4
[INFO] [stderr]    Compiling litrs v0.5.1
[INFO] [stderr]    Compiling culit v0.6.0
[INFO] [stderr]     Checking syn v2.0.108
[INFO] [stderr]     Checking whippyunits-core v0.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling op_result v0.5.8
[INFO] [stderr]    Compiling whippyunits-proc-macros v0.1.0
[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/whippyunits-proc-macros-0.1.0/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![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 `whippyunits-proc-macros` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "64996d6a98c196f3d4b3af9a9e418433b32cdfb12fb5cdb14cadd2b48983ae58", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "64996d6a98c196f3d4b3af9a9e418433b32cdfb12fb5cdb14cadd2b48983ae58", kill_on_drop: false }`
[INFO] [stdout] 64996d6a98c196f3d4b3af9a9e418433b32cdfb12fb5cdb14cadd2b48983ae58