[INFO] updating cached repository waf/task
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/waf/task
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/waf/task" "work/ex/beta-1.38-1/sources/1.37.0/gh/waf/task"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/waf/task'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/waf/task" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/waf/task"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/waf/task'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 861bd9a01ce73f62d308cd445e06bb60f18fe629
[INFO] sha for GitHub repo waf/task: 861bd9a01ce73f62d308cd445e06bb60f18fe629
[INFO] validating manifest of waf/task 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 waf/task 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 waf/task
[INFO] finished frobbing waf/task
[INFO] frobbed toml for waf/task written to work/ex/beta-1.38-1/sources/1.37.0/gh/waf/task/Cargo.toml
[INFO] started frobbing waf/task
[INFO] finished frobbing waf/task
[INFO] frobbed toml for waf/task written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/waf/task/Cargo.toml
[INFO] crate waf/task 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 waf/task against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/waf/task:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 132fa087363673cec5578f6b9c9c379958f5b3f53bfd7661d9a9aeffd43b3377
[INFO] running `"docker" "start" "-a" "132fa087363673cec5578f6b9c9c379958f5b3f53bfd7661d9a9aeffd43b3377"`
[INFO] [stderr]    Compiling rustc-serialize v0.3.19
[INFO] [stderr]    Compiling quote v0.2.0
[INFO] [stderr]    Compiling unicode-width v0.1.3
[INFO] [stderr]    Compiling serde v0.8.10
[INFO] [stderr]    Compiling unicode-segmentation v0.1.2
[INFO] [stderr]    Compiling aho-corasick v0.5.3
[INFO] [stderr]    Compiling term v0.4.4
[INFO] [stderr]    Compiling thread-id v2.0.0
[INFO] [stderr]    Compiling thread_local v0.2.7
[INFO] [stderr] error[E0642]: patterns aren't allowed in methods without bodies
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/rustc-serialize-0.3.19/src/serialize.rs:147:45
[INFO] [stderr]     |
[INFO] [stderr] 147 |                                             &f_name: &str,
[INFO] [stderr]     |                                             ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling syn v0.8.3
[INFO] [stderr]    Compiling regex v0.1.77
[INFO] [stderr]    Compiling clap v2.13.0
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0642`.
[INFO] [stderr] error: Could not compile `rustc-serialize`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "132fa087363673cec5578f6b9c9c379958f5b3f53bfd7661d9a9aeffd43b3377"`
[INFO] running `"docker" "rm" "-f" "132fa087363673cec5578f6b9c9c379958f5b3f53bfd7661d9a9aeffd43b3377"`
[INFO] [stdout] 132fa087363673cec5578f6b9c9c379958f5b3f53bfd7661d9a9aeffd43b3377