[INFO] updating cached repository vonforum/rsepl
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/vonforum/rsepl
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/vonforum/rsepl" "work/ex/beta-1.38-1/sources/1.37.0/gh/vonforum/rsepl"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/vonforum/rsepl'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/vonforum/rsepl" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vonforum/rsepl"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vonforum/rsepl'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e7d40a97f37f58197384037258acfa5ec2768809
[INFO] sha for GitHub repo vonforum/rsepl: e7d40a97f37f58197384037258acfa5ec2768809
[INFO] validating manifest of vonforum/rsepl 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 vonforum/rsepl 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 vonforum/rsepl
[INFO] finished frobbing vonforum/rsepl
[INFO] frobbed toml for vonforum/rsepl written to work/ex/beta-1.38-1/sources/1.37.0/gh/vonforum/rsepl/Cargo.toml
[INFO] started frobbing vonforum/rsepl
[INFO] finished frobbing vonforum/rsepl
[INFO] frobbed toml for vonforum/rsepl written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vonforum/rsepl/Cargo.toml
[INFO] crate vonforum/rsepl 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing vonforum/rsepl 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/vonforum/rsepl:/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] bd0ea3d0734f5f7413fd8ac381bf13db482a072a15fe6b93bafa8e111b85cce4
[INFO] running `"docker" "start" "-a" "bd0ea3d0734f5f7413fd8ac381bf13db482a072a15fe6b93bafa8e111b85cce4"`
[INFO] [stderr]    Compiling dirs v1.0.5
[INFO] [stderr]    Compiling nix v0.11.0
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling rustyline v3.0.0
[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-3.0.0/src/lib.rs:655:43
[INFO] [stderr]     |
[INFO] [stderr] 655 |             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" "bd0ea3d0734f5f7413fd8ac381bf13db482a072a15fe6b93bafa8e111b85cce4"`
[INFO] running `"docker" "rm" "-f" "bd0ea3d0734f5f7413fd8ac381bf13db482a072a15fe6b93bafa8e111b85cce4"`
[INFO] [stdout] bd0ea3d0734f5f7413fd8ac381bf13db482a072a15fe6b93bafa8e111b85cce4