[INFO] fetching crate trace2 0.1.0...
[INFO] testing trace2-0.1.0 against 1.47.0 for beta-1.48-1
[INFO] extracting crate trace2 0.1.0 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate trace2 0.1.0 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", 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-13/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] c019992e70d519e897869f1d5411ff1d9068e273e4b126cac8b7aa57eeebed0e
[INFO] running `Command { std: "docker" "start" "-a" "c019992e70d519e897869f1d5411ff1d9068e273e4b126cac8b7aa57eeebed0e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c019992e70d519e897869f1d5411ff1d9068e273e4b126cac8b7aa57eeebed0e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c019992e70d519e897869f1d5411ff1d9068e273e4b126cac8b7aa57eeebed0e", kill_on_drop: false }`
[INFO] [stdout] c019992e70d519e897869f1d5411ff1d9068e273e4b126cac8b7aa57eeebed0e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4db0ccf2f7af8fc6223f6941087f71ade5b96b64a9f0d6abfce2c7f4f9719736
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4db0ccf2f7af8fc6223f6941087f71ade5b96b64a9f0d6abfce2c7f4f9719736", kill_on_drop: false }`
[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]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[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`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "4db0ccf2f7af8fc6223f6941087f71ade5b96b64a9f0d6abfce2c7f4f9719736", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4db0ccf2f7af8fc6223f6941087f71ade5b96b64a9f0d6abfce2c7f4f9719736", kill_on_drop: false }`
[INFO] [stdout] 4db0ccf2f7af8fc6223f6941087f71ade5b96b64a9f0d6abfce2c7f4f9719736
