[INFO] updating cached repository potatofarms/printer-api
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/potatofarms/printer-api
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/potatofarms/printer-api" "work/ex/beta-1.38-1/sources/1.37.0/gh/potatofarms/printer-api"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/potatofarms/printer-api'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/potatofarms/printer-api" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/potatofarms/printer-api"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/potatofarms/printer-api'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 68e1ba965de0a1227cb71f1fdac2e40ff37ca84c
[INFO] sha for GitHub repo potatofarms/printer-api: 68e1ba965de0a1227cb71f1fdac2e40ff37ca84c
[INFO] validating manifest of potatofarms/printer-api on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of potatofarms/printer-api on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing potatofarms/printer-api
[INFO] finished frobbing potatofarms/printer-api
[INFO] frobbed toml for potatofarms/printer-api written to work/ex/beta-1.38-1/sources/1.37.0/gh/potatofarms/printer-api/Cargo.toml
[INFO] started frobbing potatofarms/printer-api
[INFO] finished frobbing potatofarms/printer-api
[INFO] frobbed toml for potatofarms/printer-api written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/potatofarms/printer-api/Cargo.toml
[INFO] crate potatofarms/printer-api already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing potatofarms/printer-api against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/potatofarms/printer-api:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 24238823fc908f7aaa39aed264fb50e56cb93cf4cee4c2eeab68f69a6ff97046
[INFO] running `"docker" "start" "-a" "24238823fc908f7aaa39aed264fb50e56cb93cf4cee4c2eeab68f69a6ff97046"`
[INFO] [stderr]    Compiling typenum v1.5.2
[INFO] [stderr]    Compiling odds v0.2.25
[INFO] [stderr]    Compiling openssl v0.9.19
[INFO] [stderr]    Compiling gcc v0.3.53
[INFO] [stderr]    Compiling byte-tools v0.1.3
[INFO] [stderr]    Compiling yansi v0.3.3
[INFO] [stderr]    Compiling md5 v0.3.5
[INFO] [stderr]    Compiling fallible-iterator v0.1.3
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/yansi-0.3.3/src/lib.rs:1:32
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![cfg_attr(feature="nightly", feature(const_fn))]
[INFO] [stderr]   |                                ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling pear v0.0.10
[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 `yansi`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "24238823fc908f7aaa39aed264fb50e56cb93cf4cee4c2eeab68f69a6ff97046"`
[INFO] running `"docker" "rm" "-f" "24238823fc908f7aaa39aed264fb50e56cb93cf4cee4c2eeab68f69a6ff97046"`
[INFO] [stdout] 24238823fc908f7aaa39aed264fb50e56cb93cf4cee4c2eeab68f69a6ff97046