[INFO] fetching crate wood 0.4.3...
[INFO] testing wood-0.4.3 against 1.49.0 for beta-1.50-1
[INFO] extracting crate wood 0.4.3 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate wood 0.4.3 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate wood 0.4.3
[INFO] finished tweaking crates.io crate wood 0.4.3
[INFO] tweaked toml for crates.io crate wood 0.4.3 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate crates.io crate wood 0.4.3 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 812456a92b6693fc9278eb7d1caaab4e5b59ae55891e552161968a7649ae3c23
[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" "812456a92b6693fc9278eb7d1caaab4e5b59ae55891e552161968a7649ae3c23", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "812456a92b6693fc9278eb7d1caaab4e5b59ae55891e552161968a7649ae3c23", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "812456a92b6693fc9278eb7d1caaab4e5b59ae55891e552161968a7649ae3c23", kill_on_drop: false }`
[INFO] [stdout] 812456a92b6693fc9278eb7d1caaab4e5b59ae55891e552161968a7649ae3c23
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", 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] d546f5cd0f0af6670db673835877fd9e787688218e27cd16cf51e5b6cd757003
[INFO] running `Command { std: "docker" "start" "-a" "d546f5cd0f0af6670db673835877fd9e787688218e27cd16cf51e5b6cd757003", kill_on_drop: false }`
[INFO] [stderr]    Compiling ref_slice v1.1.1
[INFO] [stderr]    Compiling wood v0.4.3 (/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(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(drain_filter)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(core_intrinsics)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition
[INFO] [stdout]    --> src/lib.rs:232:1
[INFO] [stdout]     |
[INFO] [stdout] 232 | / macro_rules! wood_assert {
[INFO] [stdout] 233 | |     ($term:expr, $condition:expr, $message:expr) => {
[INFO] [stdout] 234 | |         if !$condition {
[INFO] [stdout] 235 | |             let (l, c) = ($term).line_and_col();
[INFO] [stdout] ...   |
[INFO] [stdout] 244 | |     };
[INFO] [stdout] 245 | | }
[INFO] [stdout]     | |_^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_macros)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `wood`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "d546f5cd0f0af6670db673835877fd9e787688218e27cd16cf51e5b6cd757003", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d546f5cd0f0af6670db673835877fd9e787688218e27cd16cf51e5b6cd757003", kill_on_drop: false }`
[INFO] [stdout] d546f5cd0f0af6670db673835877fd9e787688218e27cd16cf51e5b6cd757003