[INFO] updating cached repository davidsullins/AdventOfRust2018
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/davidsullins/AdventOfRust2018
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/davidsullins/AdventOfRust2018" "work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/davidsullins/AdventOfRust2018"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/davidsullins/AdventOfRust2018'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/davidsullins/AdventOfRust2018" "work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/davidsullins/AdventOfRust2018"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/davidsullins/AdventOfRust2018'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6260e6579d36fd6f5e5d3fea48409ac92031ba04
[INFO] sha for GitHub repo davidsullins/AdventOfRust2018: 6260e6579d36fd6f5e5d3fea48409ac92031ba04
[INFO] validating manifest of davidsullins/AdventOfRust2018 on toolchain master#a850a426491e14186af2250549bf41256b5938d2
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of davidsullins/AdventOfRust2018 on toolchain try#06a150c7d11500b41499224f165e9de1de096768
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing davidsullins/AdventOfRust2018
[INFO] finished frobbing davidsullins/AdventOfRust2018
[INFO] frobbed toml for davidsullins/AdventOfRust2018 written to work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/davidsullins/AdventOfRust2018/Cargo.toml
[INFO] started frobbing davidsullins/AdventOfRust2018
[INFO] finished frobbing davidsullins/AdventOfRust2018
[INFO] frobbed toml for davidsullins/AdventOfRust2018 written to work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/davidsullins/AdventOfRust2018/Cargo.toml
[INFO] crate davidsullins/AdventOfRust2018 already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking davidsullins/AdventOfRust2018 against master#a850a426491e14186af2250549bf41256b5938d2 for pr-60162
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60162/worker-2/master#a850a426491e14186af2250549bf41256b5938d2:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/davidsullins/AdventOfRust2018:/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" "+a850a426491e14186af2250549bf41256b5938d2-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 9332ba8bfe1e294eafc39033b2ef36de3825c3e3be03812fe77519d897181589
[INFO] running `"docker" "start" "-a" "9332ba8bfe1e294eafc39033b2ef36de3825c3e3be03812fe77519d897181589"`
[INFO] [stderr]     Checking AdventOfRust2018 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: cannot borrow `letter_count` as mutable because it is also borrowed as immutable
[INFO] [stderr]   --> src/bin/day2.rs:25:13
[INFO] [stderr]    |
[INFO] [stderr] 24 |             let count = letter_count.get(&c).unwrap_or(&0);
[INFO] [stderr]    |                         ------------ immutable borrow occurs here
[INFO] [stderr] 25 |             letter_count.insert(c, count + 1);
[INFO] [stderr]    |             ^^^^^^^^^^^^           ----- immutable borrow later used here
[INFO] [stderr]    |             |
[INFO] [stderr]    |             mutable borrow occurs here
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(mutable_borrow_reservation_conflict)] on by default
[INFO] [stderr]    = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stderr]    = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stderr] 
[INFO] [stderr] warning: cannot borrow `letter_count` as mutable because it is also borrowed as immutable
[INFO] [stderr]   --> src/bin/day2.rs:25:13
[INFO] [stderr]    |
[INFO] [stderr] 24 |             let count = letter_count.get(&c).unwrap_or(&0);
[INFO] [stderr]    |                         ------------ immutable borrow occurs here
[INFO] [stderr] 25 |             letter_count.insert(c, count + 1);
[INFO] [stderr]    |             ^^^^^^^^^^^^           ----- immutable borrow later used here
[INFO] [stderr]    |             |
[INFO] [stderr]    |             mutable borrow occurs here
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(mutable_borrow_reservation_conflict)] on by default
[INFO] [stderr]    = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stderr]    = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.83s
[INFO] running `"docker" "inspect" "9332ba8bfe1e294eafc39033b2ef36de3825c3e3be03812fe77519d897181589"`
[INFO] running `"docker" "rm" "-f" "9332ba8bfe1e294eafc39033b2ef36de3825c3e3be03812fe77519d897181589"`
[INFO] [stdout] 9332ba8bfe1e294eafc39033b2ef36de3825c3e3be03812fe77519d897181589