[INFO] fetching crate tcalc-rustyline 1.0.2...
[INFO] extracting crate tcalc-rustyline 1.0.2 into work/ex/beta-1.37-6/sources/1.36.0/reg/tcalc-rustyline/1.0.2
[INFO] extracting crate tcalc-rustyline 1.0.2 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/tcalc-rustyline/1.0.2
[INFO] validating manifest of tcalc-rustyline-1.0.2 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of tcalc-rustyline-1.0.2 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing tcalc-rustyline-1.0.2
[INFO] finished frobbing tcalc-rustyline-1.0.2
[INFO] frobbed toml for tcalc-rustyline-1.0.2 written to work/ex/beta-1.37-6/sources/1.36.0/reg/tcalc-rustyline/1.0.2/Cargo.toml
[INFO] started frobbing tcalc-rustyline-1.0.2
[INFO] finished frobbing tcalc-rustyline-1.0.2
[INFO] frobbed toml for tcalc-rustyline-1.0.2 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/tcalc-rustyline/1.0.2/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing tcalc-rustyline-1.0.2 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/tcalc-rustyline/1.0.2:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] cec5def3ff20d80c7a9f76b43ae38c9afade32d2de6bf276a276bcd61a8e0c77
[INFO] running `"docker" "start" "-a" "cec5def3ff20d80c7a9f76b43ae38c9afade32d2de6bf276a276bcd61a8e0c77"`
[INFO] [stderr]    Compiling tcalc-rustyline v1.0.2 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.96s
[INFO] running `"docker" "inspect" "cec5def3ff20d80c7a9f76b43ae38c9afade32d2de6bf276a276bcd61a8e0c77"`
[INFO] running `"docker" "rm" "-f" "cec5def3ff20d80c7a9f76b43ae38c9afade32d2de6bf276a276bcd61a8e0c77"`
[INFO] [stdout] cec5def3ff20d80c7a9f76b43ae38c9afade32d2de6bf276a276bcd61a8e0c77
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/tcalc-rustyline/1.0.2:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] c9565db4b1a569d0e86d65f8c4a9a69ea5f86d6f2bd9ef8c109b7693cde40f70
[INFO] running `"docker" "start" "-a" "c9565db4b1a569d0e86d65f8c4a9a69ea5f86d6f2bd9ef8c109b7693cde40f70"`
[INFO] [stderr]    Compiling tcalc-rustyline v1.0.2 (/opt/crater/workdir)
[INFO] [stderr] error[E0283]: type annotations required: cannot resolve `std::string::String: std::convert::AsRef<_>`
[INFO] [stderr]   --> examples/example.rs:31:43
[INFO] [stderr]    |
[INFO] [stderr] 31 |                 rl.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 `tcalc-rustyline`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: function is never used: `chars`
[INFO] [stderr]   --> src/char_iter.rs:12:1
[INFO] [stderr]    |
[INFO] [stderr] 12 | / pub fn chars<R: Read>(read: R) -> Chars<R>
[INFO] [stderr] 13 | |     where R: Sized
[INFO] [stderr] 14 | | {
[INFO] [stderr] 15 | |     Chars { inner: read }
[INFO] [stderr] 16 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Chars`
[INFO] [stderr]   --> src/char_iter.rs:44:1
[INFO] [stderr]    |
[INFO] [stderr] 44 | pub struct Chars<R> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "c9565db4b1a569d0e86d65f8c4a9a69ea5f86d6f2bd9ef8c109b7693cde40f70"`
[INFO] running `"docker" "rm" "-f" "c9565db4b1a569d0e86d65f8c4a9a69ea5f86d6f2bd9ef8c109b7693cde40f70"`
[INFO] [stdout] c9565db4b1a569d0e86d65f8c4a9a69ea5f86d6f2bd9ef8c109b7693cde40f70