[INFO] fetching crate buf 0.2.2...
[INFO] checking buf-0.2.2 against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] extracting crate buf 0.2.2 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate buf 0.2.2 on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate buf 0.2.2
[INFO] finished tweaking crates.io crate buf 0.2.2
[INFO] tweaked toml for crates.io crate buf 0.2.2 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ptr v0.2.1
[INFO] [stderr]   Downloaded hash-table v0.2.2
[INFO] [stderr]   Downloaded rel v0.2.0
[INFO] [stderr]   Downloaded default_allocator v0.3.0
[INFO] [stderr]   Downloaded i-o v0.4.4
[INFO] [stderr]   Downloaded heap v0.1.0
[INFO] [stderr]   Downloaded fallible v0.1.2
[INFO] [stderr]   Downloaded containers v0.9.5
[INFO] [stderr]   Downloaded loca v0.7.2
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "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] bed17bb76a484f5c103415bf413dc563a0ad76631a3856212bfa2d5e06563da9
[INFO] running `"docker" "start" "-a" "bed17bb76a484f5c103415bf413dc563a0ad76631a3856212bfa2d5e06563da9"`
[INFO] [stderr]    Compiling ptr v0.2.1
[INFO] [stderr]    Compiling hash-table v0.2.2
[INFO] [stderr]    Compiling containers v0.9.5
[INFO] [stderr]     Checking slot v0.2.5
[INFO] [stderr]     Checking heap v0.1.0
[INFO] [stderr]     Checking rel v0.2.0
[INFO] [stderr]    Compiling i-o v0.4.4
[INFO] [stderr]     Checking fallible v0.1.2
[INFO] [stderr]     Checking loca v0.7.2
[INFO] [stderr]     Checking default_allocator v0.3.0
[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" "bed17bb76a484f5c103415bf413dc563a0ad76631a3856212bfa2d5e06563da9"`
[INFO] running `"docker" "rm" "-f" "bed17bb76a484f5c103415bf413dc563a0ad76631a3856212bfa2d5e06563da9"`
[INFO] [stdout] bed17bb76a484f5c103415bf413dc563a0ad76631a3856212bfa2d5e06563da9