[INFO] updating cached repository suelz/ch6
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/suelz/ch6
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/suelz/ch6" "work/ex/pr-59527/sources/master#003382e4150984cb476047b3925edf8d75df2d59/gh/suelz/ch6"`
[INFO] [stderr] Cloning into 'work/ex/pr-59527/sources/master#003382e4150984cb476047b3925edf8d75df2d59/gh/suelz/ch6'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/suelz/ch6" "work/ex/pr-59527/sources/try#47f4f94676fbdd494dd2c2dc9ac377a13fc78e00/gh/suelz/ch6"`
[INFO] [stderr] Cloning into 'work/ex/pr-59527/sources/try#47f4f94676fbdd494dd2c2dc9ac377a13fc78e00/gh/suelz/ch6'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 376c0cbb4e07405e5d69701e712d6890f2316883
[INFO] sha for GitHub repo suelz/ch6: 376c0cbb4e07405e5d69701e712d6890f2316883
[INFO] validating manifest of suelz/ch6 on toolchain master#003382e4150984cb476047b3925edf8d75df2d59
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+003382e4150984cb476047b3925edf8d75df2d59-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of suelz/ch6 on toolchain try#47f4f94676fbdd494dd2c2dc9ac377a13fc78e00
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+47f4f94676fbdd494dd2c2dc9ac377a13fc78e00-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing suelz/ch6
[INFO] finished frobbing suelz/ch6
[INFO] frobbed toml for suelz/ch6 written to work/ex/pr-59527/sources/master#003382e4150984cb476047b3925edf8d75df2d59/gh/suelz/ch6/Cargo.toml
[INFO] started frobbing suelz/ch6
[INFO] finished frobbing suelz/ch6
[INFO] frobbed toml for suelz/ch6 written to work/ex/pr-59527/sources/try#47f4f94676fbdd494dd2c2dc9ac377a13fc78e00/gh/suelz/ch6/Cargo.toml
[INFO] crate suelz/ch6 already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+003382e4150984cb476047b3925edf8d75df2d59-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+47f4f94676fbdd494dd2c2dc9ac377a13fc78e00-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking suelz/ch6 against master#003382e4150984cb476047b3925edf8d75df2d59 for pr-59527
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-59527/worker-2/master#003382e4150984cb476047b3925edf8d75df2d59:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-59527/sources/master#003382e4150984cb476047b3925edf8d75df2d59/gh/suelz/ch6:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/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=forbid" "-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" "+003382e4150984cb476047b3925edf8d75df2d59-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] e50c28e2050ec9ffa2a4c2c7cd3c2310689858d2e279f19a6215b900e1a63fd7
[INFO] running `"docker" "start" "-a" "e50c28e2050ec9ffa2a4c2c7cd3c2310689858d2e279f19a6215b900e1a63fd7"`
[INFO] [stderr]     Checking ch6 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `six`
[INFO] [stderr]   --> src/main.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let six = plus_one(five);
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_six`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `none`
[INFO] [stderr]   --> src/main.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let none = plus_one(None);
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_none`
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Coin`
[INFO] [stderr]  --> src/main.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | enum Coin{
[INFO] [stderr]   | ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `value_in_cents`
[INFO] [stderr]   --> src/main.rs:56:1
[INFO] [stderr]    |
[INFO] [stderr] 56 | fn value_in_cents(coin: Coin) ->u32{
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `six`
[INFO] [stderr]   --> src/main.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let six = plus_one(five);
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_six`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `none`
[INFO] [stderr]   --> src/main.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let none = plus_one(None);
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_none`
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Coin`
[INFO] [stderr]  --> src/main.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | enum Coin{
[INFO] [stderr]   | ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `value_in_cents`
[INFO] [stderr]   --> src/main.rs:56:1
[INFO] [stderr]    |
[INFO] [stderr] 56 | fn value_in_cents(coin: Coin) ->u32{
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.16s
[INFO] running `"docker" "inspect" "e50c28e2050ec9ffa2a4c2c7cd3c2310689858d2e279f19a6215b900e1a63fd7"`
[INFO] running `"docker" "rm" "-f" "e50c28e2050ec9ffa2a4c2c7cd3c2310689858d2e279f19a6215b900e1a63fd7"`
[INFO] [stdout] e50c28e2050ec9ffa2a4c2c7cd3c2310689858d2e279f19a6215b900e1a63fd7