[INFO] updating cached repository cis198-2016f/shell-workshop
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/cis198-2016f/shell-workshop
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/cis198-2016f/shell-workshop" "work/ex/beta-1.38-1/sources/1.37.0/gh/cis198-2016f/shell-workshop"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/cis198-2016f/shell-workshop'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/cis198-2016f/shell-workshop" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cis198-2016f/shell-workshop"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cis198-2016f/shell-workshop'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8e19147715ee3e1df4be8701dfcb0e7cc34eb51d
[INFO] sha for GitHub repo cis198-2016f/shell-workshop: 8e19147715ee3e1df4be8701dfcb0e7cc34eb51d
[INFO] validating manifest of cis198-2016f/shell-workshop 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 cis198-2016f/shell-workshop 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 cis198-2016f/shell-workshop
[INFO] finished frobbing cis198-2016f/shell-workshop
[INFO] frobbed toml for cis198-2016f/shell-workshop written to work/ex/beta-1.38-1/sources/1.37.0/gh/cis198-2016f/shell-workshop/Cargo.toml
[INFO] started frobbing cis198-2016f/shell-workshop
[INFO] finished frobbing cis198-2016f/shell-workshop
[INFO] frobbed toml for cis198-2016f/shell-workshop written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cis198-2016f/shell-workshop/Cargo.toml
[INFO] crate cis198-2016f/shell-workshop 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 cis198-2016f/shell-workshop 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-5/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/cis198-2016f/shell-workshop:/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] 3e1888f8c1965a09314e536d0f3c0797339d098043d7eeaf18bf620473615d38
[INFO] running `"docker" "start" "-a" "3e1888f8c1965a09314e536d0f3c0797339d098043d7eeaf18bf620473615d38"`
[INFO] [stderr]    Compiling shell-workshop v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0425]: cannot find function `write_flush` in this scope
[INFO] [stderr]   --> src/main.rs:23:14
[INFO] [stderr]    |
[INFO] [stderr] 23 |         try!(write_flush("eggs> "));
[INFO] [stderr]    |              ^^^^^^^^^^^ help: a function with a similar name exists: `print_flush`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::process::Command`
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::process::Command;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::thread`
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::thread;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::path::Path`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::path::Path;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::env`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::env;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]   --> src/main.rs:28:5
[INFO] [stderr]    |
[INFO] [stderr] 28 |     Ok(())
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0425`.
[INFO] [stderr] error: Could not compile `shell-workshop`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "3e1888f8c1965a09314e536d0f3c0797339d098043d7eeaf18bf620473615d38"`
[INFO] running `"docker" "rm" "-f" "3e1888f8c1965a09314e536d0f3c0797339d098043d7eeaf18bf620473615d38"`
[INFO] [stdout] 3e1888f8c1965a09314e536d0f3c0797339d098043d7eeaf18bf620473615d38