[INFO] fetching crate unix-tty 0.3.2...
[INFO] checking unix-tty-0.3.2 against try#38f08371587f97c145dedb2c055ac7b01bf1e788 for pr-65294
[INFO] extracting crate unix-tty 0.3.2 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate unix-tty 0.3.2 on toolchain 38f08371587f97c145dedb2c055ac7b01bf1e788
[INFO] running `"/workspace/cargo-home/bin/cargo" "+38f08371587f97c145dedb2c055ac7b01bf1e788" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate unix-tty 0.3.2
[INFO] finished tweaking crates.io crate unix-tty 0.3.2
[INFO] tweaked toml for crates.io crate unix-tty 0.3.2 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+38f08371587f97c145dedb2c055ac7b01bf1e788" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+38f08371587f97c145dedb2c055ac7b01bf1e788" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded idem v0.4.0
[INFO] [stderr]   Downloaded unix v0.6.7
[INFO] [stderr]   Downloaded hash-table v0.2.2
[INFO] [stderr]   Downloaded tempus v0.2.3
[INFO] [stderr]   Downloaded idem v0.1.1
[INFO] [stderr]   Downloaded rel v0.2.0
[INFO] [stderr]   Downloaded i-o v0.4.4
[INFO] [stderr]   Downloaded default_allocator v0.3.0
[INFO] [stderr]   Downloaded containers v0.9.5
[INFO] [stderr]   Downloaded slot v0.2.5
[INFO] [stderr]   Downloaded heap v0.1.0
[INFO] running `"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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+38f08371587f97c145dedb2c055ac7b01bf1e788" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 0b21cdefb2a2d4fef9e6071f392cd55a75508fb93a8943c5399cc53f61056703
[INFO] running `"docker" "start" "-a" "0b21cdefb2a2d4fef9e6071f392cd55a75508fb93a8943c5399cc53f61056703"`
[INFO] [stderr]    Compiling hash-table v0.2.2
[INFO] [stderr]    Compiling containers v0.9.5
[INFO] [stderr]     Checking slot v0.2.5
[INFO] [stderr]    Compiling i-o v0.4.4
[INFO] [stderr]     Checking rel v0.2.0
[INFO] [stderr]     Checking heap v0.1.0
[INFO] [stderr]     Checking idem v0.4.0
[INFO] [stderr]     Checking utf v0.1.5
[INFO] [stderr]     Checking system-call v0.1.1
[INFO] [stderr]     Checking flags v0.1.3
[INFO] [stderr]     Checking syscall v0.2.1
[INFO] [stderr]     Checking fallible v0.1.2
[INFO] [stderr]     Checking idem v0.1.1
[INFO] [stderr]    Compiling unix v0.6.7
[INFO] [stderr]     Checking null-terminated v0.3.9
[INFO] [stderr]     Checking default_allocator v0.3.0
[INFO] [stderr]     Checking tempus v0.2.3
[INFO] [stderr] error[E0635]: unknown feature `const_slice_len`
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/containers-0.9.5/src/lib.rs:7:12
[INFO] [stderr]   |
[INFO] [stderr] 7 | #![feature(const_slice_len)]
[INFO] [stderr]   |            ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0635`.
[INFO] [stderr] error: could not compile `containers`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "0b21cdefb2a2d4fef9e6071f392cd55a75508fb93a8943c5399cc53f61056703"`
[INFO] running `"docker" "rm" "-f" "0b21cdefb2a2d4fef9e6071f392cd55a75508fb93a8943c5399cc53f61056703"`
[INFO] [stdout] 0b21cdefb2a2d4fef9e6071f392cd55a75508fb93a8943c5399cc53f61056703