[INFO] updating cached repository pearl/scrap
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/pearl/scrap
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/pearl/scrap" "work/ex/beta-1.38-1/sources/1.37.0/gh/pearl/scrap"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/pearl/scrap'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/pearl/scrap" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pearl/scrap"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pearl/scrap'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 769b39582cefe993f852db50d418ee881c3cbcfa
[INFO] sha for GitHub repo pearl/scrap: 769b39582cefe993f852db50d418ee881c3cbcfa
[INFO] validating manifest of pearl/scrap 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 pearl/scrap 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 pearl/scrap
[INFO] finished frobbing pearl/scrap
[INFO] frobbed toml for pearl/scrap written to work/ex/beta-1.38-1/sources/1.37.0/gh/pearl/scrap/Cargo.toml
[INFO] started frobbing pearl/scrap
[INFO] finished frobbing pearl/scrap
[INFO] frobbed toml for pearl/scrap written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pearl/scrap/Cargo.toml
[INFO] crate pearl/scrap 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing pearl/scrap 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-2/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/pearl/scrap:/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] d9f812c7e777cc70911c6522e743a3e15fcac6b08f6c43d097d7c0ce8925ce31
[INFO] running `"docker" "start" "-a" "d9f812c7e777cc70911c6522e743a3e15fcac6b08f6c43d097d7c0ce8925ce31"`
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling pulldown-cmark v0.5.2
[INFO] [stderr]    Compiling literalext v0.1.1
[INFO] [stderr]    Compiling maud_htmlescape v0.17.0
[INFO] [stderr]    Compiling scoped-tls v1.0.0
[INFO] [stderr]    Compiling num-traits v0.2.7
[INFO] [stderr]    Compiling num-integer v0.1.40
[INFO] [stderr]    Compiling want v0.0.6
[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/literalext-0.1.1/src/lib.rs:19:37
[INFO] [stderr]    |
[INFO] [stderr] 19 | #![cfg_attr(feature = "proc-macro", feature(proc_macro))]
[INFO] [stderr]    |                                     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling iovec v0.1.2
[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 `literalext`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "d9f812c7e777cc70911c6522e743a3e15fcac6b08f6c43d097d7c0ce8925ce31"`
[INFO] running `"docker" "rm" "-f" "d9f812c7e777cc70911c6522e743a3e15fcac6b08f6c43d097d7c0ce8925ce31"`
[INFO] [stdout] d9f812c7e777cc70911c6522e743a3e15fcac6b08f6c43d097d7c0ce8925ce31