[INFO] updating cached repository https://github.com/johnpmayer/clamor
[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] d3cad3665ec21944a3e3c5ee41e2b78ebd844f2b
[INFO] testing johnpmayer/clamor against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjohnpmayer%2Fclamor" "work/builds/worker-3/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/johnpmayer/clamor 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/johnpmayer/clamor
[INFO] finished tweaking git repo https://github.com/johnpmayer/clamor
[INFO] tweaked toml for git repo https://github.com/johnpmayer/clamor written to work/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/johnpmayer/clamor 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] running `"docker" "create" "-v" "/big/crater/work/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-3/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] 4be244fe8bdc19391dd1d9d0fa0cfe9da0c891bfef5e7e9a03dff14112b4a8dc
[INFO] running `"docker" "start" "-a" "4be244fe8bdc19391dd1d9d0fa0cfe9da0c891bfef5e7e9a03dff14112b4a8dc"`
[INFO] [stderr]    Compiling sdl2-sys v0.30.0
[INFO] [stderr]    Compiling primal-estimate v0.2.1
[INFO] [stderr]    Compiling matrixmultiply v0.1.13
[INFO] [stderr]    Compiling allocators v0.1.0 (https://github.com/citybound/citybound#92415ab0)
[INFO] [stderr]    Compiling nodrop v0.1.11
[INFO] [stderr]    Compiling primal-bit v0.2.4
[INFO] [stderr]    Compiling num-bigint v0.1.40
[INFO] [stderr]    Compiling alga v0.5.2
[INFO] [stderr]    Compiling serde_derive_internals v0.16.0
[INFO] [stderr]    Compiling compact_macros v0.1.0 (https://github.com/citybound/citybound#92415ab0)
[INFO] [stderr]    Compiling arrayvec v0.4.4
[INFO] [stderr]    Compiling generic-array v0.8.3
[INFO] [stderr]    Compiling chunked v0.1.0 (https://github.com/citybound/citybound#92415ab0)
[INFO] [stderr]    Compiling primal-sieve v0.2.7
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]   --> /opt/rustwide/cargo-home/git/checkouts/citybound-01a382b1dd62b125/92415ab/engine/chunked/src/lib.rs:12:1
[INFO] [stderr]    |
[INFO] [stderr] 12 | #![feature(box_syntax)]
[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 `chunked`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "4be244fe8bdc19391dd1d9d0fa0cfe9da0c891bfef5e7e9a03dff14112b4a8dc"`
[INFO] running `"docker" "rm" "-f" "4be244fe8bdc19391dd1d9d0fa0cfe9da0c891bfef5e7e9a03dff14112b4a8dc"`
[INFO] [stdout] 4be244fe8bdc19391dd1d9d0fa0cfe9da0c891bfef5e7e9a03dff14112b4a8dc