[INFO] updating cached repository signed/learning-rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/signed/learning-rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/signed/learning-rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/signed/learning-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/signed/learning-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/signed/learning-rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/signed/learning-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/signed/learning-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7e4885a152c4205f8a4652866ca326025f44d62e
[INFO] sha for GitHub repo signed/learning-rust: 7e4885a152c4205f8a4652866ca326025f44d62e
[INFO] validating manifest of signed/learning-rust 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 signed/learning-rust 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 signed/learning-rust
[INFO] finished frobbing signed/learning-rust
[INFO] frobbed toml for signed/learning-rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/signed/learning-rust/Cargo.toml
[INFO] started frobbing signed/learning-rust
[INFO] finished frobbing signed/learning-rust
[INFO] frobbed toml for signed/learning-rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/signed/learning-rust/Cargo.toml
[INFO] crate signed/learning-rust 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 signed/learning-rust 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/signed/learning-rust:/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] 81bc01791537da0da5fcd7b4852cd75b1fe8fc42f0c7d730db410fff0ca4d3b7
[INFO] running `"docker" "start" "-a" "81bc01791537da0da5fcd7b4852cd75b1fe8fc42f0c7d730db410fff0ca4d3b7"`
[INFO] [stderr]    Compiling learning_rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `one`
[INFO] [stderr]   --> src/main.rs:30:32
[INFO] [stderr]    |
[INFO] [stderr] 30 |         Event::Start(Tag::Link(one, two)) => event,
[INFO] [stderr]    |                                ^^^ help: consider prefixing with an underscore: `_one`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `two`
[INFO] [stderr]   --> src/main.rs:30:37
[INFO] [stderr]    |
[INFO] [stderr] 30 |         Event::Start(Tag::Link(one, two)) => event,
[INFO] [stderr]    |                                     ^^^ help: consider prefixing with an underscore: `_two`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `parser`
[INFO] [stderr]   --> src/main.rs:28:9
[INFO] [stderr]    |
[INFO] [stderr] 28 |     let parser = parser.map(|event| match event {
[INFO] [stderr]    |         ^^^^^^ help: consider prefixing with an underscore: `_parser`
[INFO] [stderr] 
[INFO] [stderr] error[E0382]: use of moved value: `event`
[INFO] [stderr]   --> src/main.rs:30:46
[INFO] [stderr]    |
[INFO] [stderr] 30 |         Event::Start(Tag::Link(one, two)) => event,
[INFO] [stderr]    |                                     ---      ^^^^^ value used here after partial move
[INFO] [stderr]    |                                     |
[INFO] [stderr]    |                                     value moved here
[INFO] [stderr]    |
[INFO] [stderr]    = note: move occurs because value has type `std::borrow::Cow<'_, str>`, which does not implement the `Copy` trait
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0382`.
[INFO] [stderr] error: Could not compile `learning_rust`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "81bc01791537da0da5fcd7b4852cd75b1fe8fc42f0c7d730db410fff0ca4d3b7"`
[INFO] running `"docker" "rm" "-f" "81bc01791537da0da5fcd7b4852cd75b1fe8fc42f0c7d730db410fff0ca4d3b7"`
[INFO] [stdout] 81bc01791537da0da5fcd7b4852cd75b1fe8fc42f0c7d730db410fff0ca4d3b7