[INFO] updating cached repository https://github.com/PolySync/howser
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d8e1d2ebb6a1534b4104d614108f6a75c3966faa
[INFO] checking PolySync/howser against try#8810c24b0958114d8dbb32d878444e8956fce80f for pr-66063
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPolySync%2Fhowser" "/workspace/builds/worker-5/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/PolySync/howser on toolchain 8810c24b0958114d8dbb32d878444e8956fce80f
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8810c24b0958114d8dbb32d878444e8956fce80f" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/PolySync/howser
[INFO] finished tweaking git repo https://github.com/PolySync/howser
[INFO] tweaked toml for git repo https://github.com/PolySync/howser written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/PolySync/howser already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8810c24b0958114d8dbb32d878444e8956fce80f" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[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=allow" "-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" "+8810c24b0958114d8dbb32d878444e8956fce80f" "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] 6b7b41e578e589a803a62b6c9fba1c7a3ea7bcbc03ec1ea05e43a9c849ba4f72
[INFO] running `"docker" "start" "-a" "6b7b41e578e589a803a62b6c9fba1c7a3ea7bcbc03ec1ea05e43a9c849ba4f72"`
[INFO] [stderr]    Compiling serde v1.0.68
[INFO] [stderr]    Compiling regex v1.0.1
[INFO] [stderr]     Checking memchr v2.0.1
[INFO] [stderr]     Checking termion v1.5.1
[INFO] [stderr]     Checking regex-syntax v0.6.1
[INFO] [stderr]    Compiling cmake v0.1.31
[INFO] [stderr]     Checking log v0.4.2
[INFO] [stderr]     Checking thread_local v0.3.5
[INFO] [stderr]     Checking clap v2.29.4
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking proptest v0.3.4
[INFO] [stderr]     Checking aho-corasick v0.6.5
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]    Compiling failure_derive v0.1.1
[INFO] [stderr]    Compiling doogie v1.0.0 (https://github.com/PolySync/doogie?tag=1.0.0#77015a45)
[INFO] [stderr]     Checking regex v0.2.11
[INFO] [stderr]     Checking failure v0.1.1
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking env_logger v0.5.10
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/rustwide/cargo-home/git/checkouts/doogie-52d9eefd866dafa0/77015a4/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(vec_remove_item)]
[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 E0554`.
[INFO] [stderr] error: could not compile `doogie`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "6b7b41e578e589a803a62b6c9fba1c7a3ea7bcbc03ec1ea05e43a9c849ba4f72"`
[INFO] running `"docker" "rm" "-f" "6b7b41e578e589a803a62b6c9fba1c7a3ea7bcbc03ec1ea05e43a9c849ba4f72"`
[INFO] [stdout] 6b7b41e578e589a803a62b6c9fba1c7a3ea7bcbc03ec1ea05e43a9c849ba4f72