[INFO] updating cached repository suzumi/grep
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/suzumi/grep
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/suzumi/grep" "work/ex/beta-1.38-1/sources/1.37.0/gh/suzumi/grep"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/suzumi/grep'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/suzumi/grep" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/suzumi/grep"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/suzumi/grep'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] bb02fc09ed1783601e946e537445f2136d1739ce
[INFO] sha for GitHub repo suzumi/grep: bb02fc09ed1783601e946e537445f2136d1739ce
[INFO] validating manifest of suzumi/grep 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 suzumi/grep 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 suzumi/grep
[INFO] finished frobbing suzumi/grep
[INFO] frobbed toml for suzumi/grep written to work/ex/beta-1.38-1/sources/1.37.0/gh/suzumi/grep/Cargo.toml
[INFO] started frobbing suzumi/grep
[INFO] finished frobbing suzumi/grep
[INFO] frobbed toml for suzumi/grep written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/suzumi/grep/Cargo.toml
[INFO] crate suzumi/grep 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 suzumi/grep 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-6/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/suzumi/grep:/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] 66c533bcea57abc24bff77bdb8a57dcf594133eb2fbcee221ec338db36c930fb
[INFO] running `"docker" "start" "-a" "66c533bcea57abc24bff77bdb8a57dcf594133eb2fbcee221ec338db36c930fb"`
[INFO] [stderr]    Compiling regex-syntax v0.3.7
[INFO] [stderr]    Compiling regex v0.1.77
[INFO] [stderr]    Compiling grep v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0061]: this function takes 1 parameter but 2 parameters were supplied
[INFO] [stderr]   --> src/main.rs:16:12
[INFO] [stderr]    |
[INFO] [stderr] 16 |   let re = Regex::new(r"{}+", pattern).unwrap();
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected 1 parameter
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]   --> src/main.rs:17:26
[INFO] [stderr]    |
[INFO] [stderr] 17 |   let caps = re.captures(content).unwrap();
[INFO] [stderr]    |                          ^^^^^^^
[INFO] [stderr]    |                          |
[INFO] [stderr]    |                          expected &str, found struct `std::string::String`
[INFO] [stderr]    |                          help: consider borrowing here: `&content`
[INFO] [stderr]    |
[INFO] [stderr]    = note: expected type `&str`
[INFO] [stderr]               found type `std::string::String`
[INFO] [stderr] 
[INFO] [stderr] error[E0277]: `()` doesn't implement `std::fmt::Display`
[INFO] [stderr]   --> src/main.rs:26:20
[INFO] [stderr]    |
[INFO] [stderr] 26 |       println!("{}", match read_file(args[2].clone()) {
[INFO] [stderr]    |  ____________________^
[INFO] [stderr] 27 | |         Ok(content) => {
[INFO] [stderr] 28 | |           extract_pattern(args[1], content)
[INFO] [stderr] 29 | |         },
[INFO] [stderr] 30 | |         Err(reason) => panic!("{}", reason)
[INFO] [stderr] 31 | |     });
[INFO] [stderr]    | |_____^ `()` cannot be formatted with the default formatter
[INFO] [stderr]    |
[INFO] [stderr]    = help: the trait `std::fmt::Display` is not implemented for `()`
[INFO] [stderr]    = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
[INFO] [stderr]    = note: required by `std::fmt::Display::fmt`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0061, E0277, E0308.
[INFO] [stderr] For more information about an error, try `rustc --explain E0061`.
[INFO] [stderr] error: Could not compile `grep`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "66c533bcea57abc24bff77bdb8a57dcf594133eb2fbcee221ec338db36c930fb"`
[INFO] running `"docker" "rm" "-f" "66c533bcea57abc24bff77bdb8a57dcf594133eb2fbcee221ec338db36c930fb"`
[INFO] [stdout] 66c533bcea57abc24bff77bdb8a57dcf594133eb2fbcee221ec338db36c930fb