[INFO] crate littlewing 0.5.0 is already in cache
[INFO] extracting crate littlewing 0.5.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/littlewing/0.5.0
[INFO] extracting crate littlewing 0.5.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/littlewing/0.5.0
[INFO] validating manifest of littlewing-0.5.0 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 littlewing-0.5.0 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 littlewing-0.5.0
[INFO] finished frobbing littlewing-0.5.0
[INFO] frobbed toml for littlewing-0.5.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/littlewing/0.5.0/Cargo.toml
[INFO] started frobbing littlewing-0.5.0
[INFO] finished frobbing littlewing-0.5.0
[INFO] frobbed toml for littlewing-0.5.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/littlewing/0.5.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 littlewing-0.5.0 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-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/littlewing/0.5.0:/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] 312ab01bc4dda2d24d432eed009ae64c2f94a184ca6156bfb2b0bd1df784d115
[INFO] running `"docker" "start" "-a" "312ab01bc4dda2d24d432eed009ae64c2f94a184ca6156bfb2b0bd1df784d115"`
[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" "312ab01bc4dda2d24d432eed009ae64c2f94a184ca6156bfb2b0bd1df784d115"`
[INFO] running `"docker" "rm" "-f" "312ab01bc4dda2d24d432eed009ae64c2f94a184ca6156bfb2b0bd1df784d115"`
[INFO] [stdout] 312ab01bc4dda2d24d432eed009ae64c2f94a184ca6156bfb2b0bd1df784d115