[INFO] updating cached repository https://github.com/PolySync/howser
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/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] testing PolySync/howser against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2FPolySync%2Fhowser" "work/builds/worker-9/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/PolySync/howser on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "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 work/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/PolySync/howser already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-9/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] a804b62fce7387e2066ec4cccf01f955732136bb0e3382f5a3f1d485cb3116c0
[INFO] running `"docker" "start" "-a" "a804b62fce7387e2066ec4cccf01f955732136bb0e3382f5a3f1d485cb3116c0"`
[INFO] [stderr]    Compiling serde v1.0.68
[INFO] [stderr]    Compiling try_from v0.2.2
[INFO] [stderr]    Compiling log v0.4.2
[INFO] [stderr]    Compiling termion v1.5.1
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling doogie v1.0.0 (https://github.com/PolySync/doogie?tag=1.0.0#77015a45)
[INFO] [stderr]    Compiling num-complex v0.1.43
[INFO] [stderr]    Compiling clap v2.29.4
[INFO] [stderr]    Compiling env_logger v0.5.10
[INFO] [stderr]    Compiling num-bigint v0.1.44
[INFO] [stderr]    Compiling num-iter v0.1.37
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling num v0.1.42
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable 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" "a804b62fce7387e2066ec4cccf01f955732136bb0e3382f5a3f1d485cb3116c0"`
[INFO] running `"docker" "rm" "-f" "a804b62fce7387e2066ec4cccf01f955732136bb0e3382f5a3f1d485cb3116c0"`
[INFO] [stdout] a804b62fce7387e2066ec4cccf01f955732136bb0e3382f5a3f1d485cb3116c0