[INFO] updating cached repository bakervm/beast
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/bakervm/beast
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/bakervm/beast" "work/ex/beta-1.38-1/sources/1.37.0/gh/bakervm/beast"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/bakervm/beast'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/bakervm/beast" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/bakervm/beast"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/bakervm/beast'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 566bc6958ec7868f50398f16cbb20c8de830e467
[INFO] sha for GitHub repo bakervm/beast: 566bc6958ec7868f50398f16cbb20c8de830e467
[INFO] validating manifest of bakervm/beast 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 bakervm/beast 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 bakervm/beast
[INFO] finished frobbing bakervm/beast
[INFO] frobbed toml for bakervm/beast written to work/ex/beta-1.38-1/sources/1.37.0/gh/bakervm/beast/Cargo.toml
[INFO] started frobbing bakervm/beast
[INFO] finished frobbing bakervm/beast
[INFO] frobbed toml for bakervm/beast written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/bakervm/beast/Cargo.toml
[INFO] crate bakervm/beast 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 bakervm/beast 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/bakervm/beast:/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] 84071be9131e4998c3f525a34fade4368fd4cb11ae1f6114f89aec462c36077a
[INFO] running `"docker" "start" "-a" "84071be9131e4998c3f525a34fade4368fd4cb11ae1f6114f89aec462c36077a"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling serde v1.0.80
[INFO] [stderr]    Compiling utf8parse v0.1.1
[INFO] [stderr]    Compiling rand_isaac v0.1.0
[INFO] [stderr]    Compiling dirs v1.0.4
[INFO] [stderr]    Compiling rmp v0.8.7
[INFO] [stderr]    Compiling structopt-derive v0.2.13
[INFO] [stderr]    Compiling failure v0.1.3
[INFO] [stderr]    Compiling rustyline v2.1.0
[INFO] [stderr] error[E0283]: type annotations required: cannot resolve `std::string::String: std::convert::AsRef<_>`
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/rustyline-2.1.0/src/lib.rs:639:43
[INFO] [stderr]     |
[INFO] [stderr] 639 |             editor.add_history_entry(line.as_ref());
[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 E0283`.
[INFO] [stderr] error: Could not compile `rustyline`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "84071be9131e4998c3f525a34fade4368fd4cb11ae1f6114f89aec462c36077a"`
[INFO] running `"docker" "rm" "-f" "84071be9131e4998c3f525a34fade4368fd4cb11ae1f6114f89aec462c36077a"`
[INFO] [stdout] 84071be9131e4998c3f525a34fade4368fd4cb11ae1f6114f89aec462c36077a