[INFO] updating cached repository sethm/uc-explorer
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/sethm/uc-explorer
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/sethm/uc-explorer" "work/ex/beta-1.38-1/sources/1.37.0/gh/sethm/uc-explorer"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/sethm/uc-explorer'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/sethm/uc-explorer" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sethm/uc-explorer"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sethm/uc-explorer'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1e092a9f2c4fb3fc96f72f673acad804c45b1800
[INFO] sha for GitHub repo sethm/uc-explorer: 1e092a9f2c4fb3fc96f72f673acad804c45b1800
[INFO] validating manifest of sethm/uc-explorer 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 sethm/uc-explorer 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 sethm/uc-explorer
[INFO] finished frobbing sethm/uc-explorer
[INFO] frobbed toml for sethm/uc-explorer written to work/ex/beta-1.38-1/sources/1.37.0/gh/sethm/uc-explorer/Cargo.toml
[INFO] started frobbing sethm/uc-explorer
[INFO] finished frobbing sethm/uc-explorer
[INFO] frobbed toml for sethm/uc-explorer written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sethm/uc-explorer/Cargo.toml
[INFO] crate sethm/uc-explorer 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 sethm/uc-explorer 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-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/sethm/uc-explorer:/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] bfa0e16c9e5496cc023a7722717841b05c625521267395bbd6c2c043c6a5449a
[INFO] running `"docker" "start" "-a" "bfa0e16c9e5496cc023a7722717841b05c625521267395bbd6c2c043c6a5449a"`
[INFO] [stderr]    Compiling utf8parse v0.1.1
[INFO] [stderr]    Compiling dirs v1.0.4
[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] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "bfa0e16c9e5496cc023a7722717841b05c625521267395bbd6c2c043c6a5449a"`
[INFO] running `"docker" "rm" "-f" "bfa0e16c9e5496cc023a7722717841b05c625521267395bbd6c2c043c6a5449a"`
[INFO] [stdout] bfa0e16c9e5496cc023a7722717841b05c625521267395bbd6c2c043c6a5449a