[INFO] cloning repository https://github.com/davidsullins/AdventOfRust2018
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/davidsullins/AdventOfRust2018" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdavidsullins%2FAdventOfRust2018", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdavidsullins%2FAdventOfRust2018'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6260e6579d36fd6f5e5d3fea48409ac92031ba04
[INFO] checking davidsullins/AdventOfRust2018 against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdavidsullins%2FAdventOfRust2018" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/davidsullins/AdventOfRust2018 on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/davidsullins/AdventOfRust2018
[INFO] finished tweaking git repo https://github.com/davidsullins/AdventOfRust2018
[INFO] tweaked toml for git repo https://github.com/davidsullins/AdventOfRust2018 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/davidsullins/AdventOfRust2018 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded bit-vec v0.5.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 90dae7327d725d676577eb4c62c6f7eedf653afeb66791f30bd9b1a25d5b8e28
[INFO] running `Command { std: "docker" "start" "-a" "90dae7327d725d676577eb4c62c6f7eedf653afeb66791f30bd9b1a25d5b8e28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "90dae7327d725d676577eb4c62c6f7eedf653afeb66791f30bd9b1a25d5b8e28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "90dae7327d725d676577eb4c62c6f7eedf653afeb66791f30bd9b1a25d5b8e28", kill_on_drop: false }`
[INFO] [stdout] 90dae7327d725d676577eb4c62c6f7eedf653afeb66791f30bd9b1a25d5b8e28
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3306d124f52101fa33980003c3e9313f1b23e5f7329ae93fc619543c6d2b3b3e
[INFO] running `Command { std: "docker" "start" "-a" "3306d124f52101fa33980003c3e9313f1b23e5f7329ae93fc619543c6d2b3b3e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling libc v0.2.44
[INFO] [stderr]     Checking cfg-if v0.1.6
[INFO] [stderr]     Checking ucd-util v0.1.3
[INFO] [stderr]    Compiling regex v1.1.0
[INFO] [stderr]     Checking lazy_static v1.2.0
[INFO] [stderr]     Checking utf8-ranges v1.0.2
[INFO] [stderr]     Checking bit-vec v0.5.0
[INFO] [stderr]     Checking regex-syntax v0.6.4
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]    Compiling memchr v2.1.1
[INFO] [stderr]     Checking aho-corasick v0.6.9
[INFO] [stderr]     Checking AdventOfRust2018 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: cannot borrow `letter_count` as mutable because it is also borrowed as immutable
[INFO] [stdout]   --> src/bin/day2.rs:25:13
[INFO] [stdout]    |
[INFO] [stdout] 24 |             let count = letter_count.get(&c).unwrap_or(&0);
[INFO] [stdout]    |                         ------------ immutable borrow occurs here
[INFO] [stdout] 25 |             letter_count.insert(c, count + 1);
[INFO] [stdout]    |             ^^^^^^^^^^^^           ----- immutable borrow later used here
[INFO] [stdout]    |             |
[INFO] [stdout]    |             mutable borrow occurs here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(mutable_borrow_reservation_conflict)]` on by default
[INFO] [stdout]    = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stdout]    = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: cannot borrow `letter_count` as mutable because it is also borrowed as immutable
[INFO] [stdout]   --> src/bin/day2.rs:25:13
[INFO] [stdout]    |
[INFO] [stdout] 24 |             let count = letter_count.get(&c).unwrap_or(&0);
[INFO] [stdout]    |                         ------------ immutable borrow occurs here
[INFO] [stdout] 25 |             letter_count.insert(c, count + 1);
[INFO] [stdout]    |             ^^^^^^^^^^^^           ----- immutable borrow later used here
[INFO] [stdout]    |             |
[INFO] [stdout]    |             mutable borrow occurs here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(mutable_borrow_reservation_conflict)]` on by default
[INFO] [stdout]    = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stdout]    = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.00s
[INFO] running `Command { std: "docker" "inspect" "3306d124f52101fa33980003c3e9313f1b23e5f7329ae93fc619543c6d2b3b3e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3306d124f52101fa33980003c3e9313f1b23e5f7329ae93fc619543c6d2b3b3e", kill_on_drop: false }`
[INFO] [stdout] 3306d124f52101fa33980003c3e9313f1b23e5f7329ae93fc619543c6d2b3b3e