[INFO] fetching crate tracing-libatrace 0.1.0...
[INFO] testing tracing-libatrace-0.1.0 against 1.91.0 for beta-1.92-2
[INFO] extracting crate tracing-libatrace 0.1.0 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate tracing-libatrace 0.1.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate tracing-libatrace 0.1.0
[INFO] tweaked toml for crates.io crate tracing-libatrace 0.1.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate tracing-libatrace 0.1.0 on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate tracing-libatrace 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" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded once_cell v1.12.0
[INFO] [stderr]   Downloaded unicode-ident v1.0.0
[INFO] [stderr]   Downloaded tokio-util v0.2.0
[INFO] [stderr]   Downloaded tracing-attributes v0.1.21
[INFO] [stderr]   Downloaded libatrace v0.1.0
[INFO] [stderr]   Downloaded tracing v0.1.34
[INFO] [stderr]   Downloaded tracing-core v0.1.26
[INFO] [stderr]   Downloaded proc-macro2 v1.0.39
[INFO] [stderr]   Downloaded tracing-subscriber v0.3.11
[INFO] [stderr]   Downloaded syn v1.0.96
[INFO] [stderr]   Downloaded libc v0.2.126
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 374e171ee8d4bd26b89d66652271d471f08d77c72c0084e2ef77804a18cf5be8
[INFO] running `Command { std: "docker" "start" "-a" "374e171ee8d4bd26b89d66652271d471f08d77c72c0084e2ef77804a18cf5be8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "374e171ee8d4bd26b89d66652271d471f08d77c72c0084e2ef77804a18cf5be8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "374e171ee8d4bd26b89d66652271d471f08d77c72c0084e2ef77804a18cf5be8", kill_on_drop: false }`
[INFO] [stdout] 374e171ee8d4bd26b89d66652271d471f08d77c72c0084e2ef77804a18cf5be8
[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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bbe41af20651a3d14df975b92e76b6b9f56abeb2be73a70ad859327d58d1a2b8
[INFO] running `Command { std: "docker" "start" "-a" "bbe41af20651a3d14df975b92e76b6b9f56abeb2be73a70ad859327d58d1a2b8", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling syn v1.0.96
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling once_cell v1.12.0
[INFO] [stderr]    Compiling tracing-core v0.1.26
[INFO] [stderr]    Compiling sharded-slab v0.1.4
[INFO] [stderr]    Compiling thread_local v1.1.4
[INFO] [stderr]    Compiling tracing-log v0.1.3
[INFO] [stderr]    Compiling tracing-subscriber v0.3.11
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]    Compiling libatrace v0.1.0
[INFO] [stderr]    Compiling tracing-attributes v0.1.21
[INFO] [stderr]    Compiling pin-project-internal v1.0.10
[INFO] [stderr]    Compiling pin-project v1.0.10
[INFO] [stderr]    Compiling tracing v0.1.34
[INFO] [stderr]    Compiling tracing-futures v0.2.5
[INFO] [stderr]    Compiling tracing-libatrace v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 11.08s
[INFO] running `Command { std: "docker" "inspect" "bbe41af20651a3d14df975b92e76b6b9f56abeb2be73a70ad859327d58d1a2b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bbe41af20651a3d14df975b92e76b6b9f56abeb2be73a70ad859327d58d1a2b8", kill_on_drop: false }`
[INFO] [stdout] bbe41af20651a3d14df975b92e76b6b9f56abeb2be73a70ad859327d58d1a2b8
[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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1af188a8bee6e4a37942ab6f6412a372e7b05829fcc67a3a38dde9e8196b1ce1
[INFO] running `Command { std: "docker" "start" "-a" "1af188a8bee6e4a37942ab6f6412a372e7b05829fcc67a3a38dde9e8196b1ce1", kill_on_drop: false }`
[INFO] [stderr]    Compiling futures-core v0.3.21
[INFO] [stderr]    Compiling slab v0.4.6
[INFO] [stderr]    Compiling futures-sink v0.3.21
[INFO] [stderr]    Compiling futures-channel v0.3.21
[INFO] [stderr]    Compiling futures-task v0.3.21
[INFO] [stderr]    Compiling iovec v0.1.4
[INFO] [stderr]    Compiling futures-util v0.3.21
[INFO] [stderr]    Compiling futures-macro v0.3.21
[INFO] [stderr]    Compiling futures-io v0.3.21
[INFO] [stderr]    Compiling net2 v0.2.37
[INFO] [stderr]    Compiling num_cpus v1.13.1
[INFO] [stderr]    Compiling signal-hook-registry v1.4.0
[INFO] [stderr]    Compiling tokio-macros v0.2.6
[INFO] [stderr]    Compiling pin-project-lite v0.1.12
[INFO] [stderr]    Compiling mio v0.6.23
[INFO] [stderr]    Compiling mio-uds v0.6.8
[INFO] [stderr]    Compiling tokio v0.2.25
[INFO] [stderr]    Compiling futures-executor v0.3.21
[INFO] [stderr]    Compiling futures v0.3.21
[INFO] [stderr]    Compiling tokio-util v0.2.0
[INFO] [stderr]    Compiling tracing-libatrace v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> examples/chat.rs:31:1
[INFO] [stdout]    |
[INFO] [stdout] 31 | #![feature(trace_macros)]
[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 `tracing-libatrace` (example "chat") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "1af188a8bee6e4a37942ab6f6412a372e7b05829fcc67a3a38dde9e8196b1ce1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1af188a8bee6e4a37942ab6f6412a372e7b05829fcc67a3a38dde9e8196b1ce1", kill_on_drop: false }`
[INFO] [stdout] 1af188a8bee6e4a37942ab6f6412a372e7b05829fcc67a3a38dde9e8196b1ce1