[INFO] fetching crate cgmath-std140 0.2.1...
[INFO] testing cgmath-std140-0.2.1 against 1.49.0 for beta-1.50-1
[INFO] extracting crate cgmath-std140 0.2.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate cgmath-std140 0.2.1 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 cgmath-std140 0.2.1
[INFO] finished tweaking crates.io crate cgmath-std140 0.2.1
[INFO] tweaked toml for crates.io crate cgmath-std140 0.2.1 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] f39c435ea1c75811b477f4c7cf7ce75c21b40543dea9c8015f673c0f3ee63373
[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" "f39c435ea1c75811b477f4c7cf7ce75c21b40543dea9c8015f673c0f3ee63373", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f39c435ea1c75811b477f4c7cf7ce75c21b40543dea9c8015f673c0f3ee63373", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f39c435ea1c75811b477f4c7cf7ce75c21b40543dea9c8015f673c0f3ee63373", kill_on_drop: false }`
[INFO] [stdout] f39c435ea1c75811b477f4c7cf7ce75c21b40543dea9c8015f673c0f3ee63373
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] e76eaf0cce248aa3454916a66f7f02076fee4cd55c1565e179043400bb2ee856
[INFO] running `Command { std: "docker" "start" "-a" "e76eaf0cce248aa3454916a66f7f02076fee4cd55c1565e179043400bb2ee856", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.57
[INFO] [stderr]    Compiling cgmath v0.17.0
[INFO] [stderr]    Compiling approx v0.3.2
[INFO] [stderr]    Compiling std140-macros v0.1.0
[INFO] [stderr]    Compiling std140 v0.2.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/std140-0.2.2/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(const_generics)]
[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 `std140`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "e76eaf0cce248aa3454916a66f7f02076fee4cd55c1565e179043400bb2ee856", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e76eaf0cce248aa3454916a66f7f02076fee4cd55c1565e179043400bb2ee856", kill_on_drop: false }`
[INFO] [stdout] e76eaf0cce248aa3454916a66f7f02076fee4cd55c1565e179043400bb2ee856