[INFO] fetching crate trace2 0.1.0...
[INFO] testing trace2-0.1.0 against 1.60.0 for beta-1.61-1
[INFO] extracting crate trace2 0.1.0 into /workspace/builds/worker-109/source
[INFO] validating manifest of crates.io crate trace2 0.1.0 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate trace2 0.1.0
[INFO] finished tweaking crates.io crate trace2 0.1.0
[INFO] tweaked toml for crates.io crate trace2 0.1.0 written to /workspace/builds/worker-109/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded trace2_macro v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-109/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-109/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f090f5a62342c1d4441835adbfffb8c37635bcb5c9f9c97ba6ebbe213be93bca
[INFO] running `Command { std: "docker" "start" "-a" "f090f5a62342c1d4441835adbfffb8c37635bcb5c9f9c97ba6ebbe213be93bca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f090f5a62342c1d4441835adbfffb8c37635bcb5c9f9c97ba6ebbe213be93bca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f090f5a62342c1d4441835adbfffb8c37635bcb5c9f9c97ba6ebbe213be93bca", kill_on_drop: false }`
[INFO] [stdout] f090f5a62342c1d4441835adbfffb8c37635bcb5c9f9c97ba6ebbe213be93bca
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-109/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-109/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5eaeba030959219a649b00bdb8e558c941f9c7f09171d9ea4b2bb29943a05eeb
[INFO] running `Command { std: "docker" "start" "-a" "5eaeba030959219a649b00bdb8e558c941f9c7f09171d9ea4b2bb29943a05eeb", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling trace2_macro v0.1.0
[INFO] [stderr]    Compiling trace2 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(use_extern_macros)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `use_extern_macros` has been stable since 1.30.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `trace2` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "5eaeba030959219a649b00bdb8e558c941f9c7f09171d9ea4b2bb29943a05eeb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5eaeba030959219a649b00bdb8e558c941f9c7f09171d9ea4b2bb29943a05eeb", kill_on_drop: false }`
[INFO] [stdout] 5eaeba030959219a649b00bdb8e558c941f9c7f09171d9ea4b2bb29943a05eeb