[INFO] cloning repository https://github.com/MRC-channel/rust_dungeon_generator
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/MRC-channel/rust_dungeon_generator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMRC-channel%2Frust_dungeon_generator", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMRC-channel%2Frust_dungeon_generator'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 53c1e5591ebe531bc52a332caf08a32d1b5c1807
[INFO] checking MRC-channel/rust_dungeon_generator against try#2b41547e41f63ea0ca9cb25417ddd569b19e6a50 for pr-134273
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMRC-channel%2Frust_dungeon_generator" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MRC-channel/rust_dungeon_generator on toolchain 2b41547e41f63ea0ca9cb25417ddd569b19e6a50
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2b41547e41f63ea0ca9cb25417ddd569b19e6a50" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/MRC-channel/rust_dungeon_generator
[INFO] finished tweaking git repo https://github.com/MRC-channel/rust_dungeon_generator
[INFO] tweaked toml for git repo https://github.com/MRC-channel/rust_dungeon_generator written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/MRC-channel/rust_dungeon_generator already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2b41547e41f63ea0ca9cb25417ddd569b19e6a50" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+2b41547e41f63ea0ca9cb25417ddd569b19e6a50" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a09aee9f60f4a387b2ace7179c54a61673de7a47d382a7108ae2e3281260f14b
[INFO] running `Command { std: "docker" "start" "-a" "a09aee9f60f4a387b2ace7179c54a61673de7a47d382a7108ae2e3281260f14b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a09aee9f60f4a387b2ace7179c54a61673de7a47d382a7108ae2e3281260f14b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a09aee9f60f4a387b2ace7179c54a61673de7a47d382a7108ae2e3281260f14b", kill_on_drop: false }`
[INFO] [stdout] a09aee9f60f4a387b2ace7179c54a61673de7a47d382a7108ae2e3281260f14b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "RUSTDOCFLAGS=--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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+2b41547e41f63ea0ca9cb25417ddd569b19e6a50" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 062af3f5f9a9d540d7f769aa3e2e9eeb053eb808621e36aaf8d70966a6c9ab9e
[INFO] running `Command { std: "docker" "start" "-a" "062af3f5f9a9d540d7f769aa3e2e9eeb053eb808621e36aaf8d70966a6c9ab9e", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking unicode-width v0.1.11
[INFO] [stderr]     Checking getrandom v0.2.12
[INFO] [stderr]     Checking console v0.15.8
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking dungeon v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `cols`
[INFO] [stdout]    --> src/main.rs:102:13
[INFO] [stdout]     |
[INFO] [stdout] 102 |         let cols = rng.gen_range(top..=(top + (rows - new_rows)));
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_cols`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cols`
[INFO] [stdout]    --> src/main.rs:102:13
[INFO] [stdout]     |
[INFO] [stdout] 102 |         let cols = rng.gen_range(top..=(top + (rows - new_rows)));
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_cols`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.29s
[INFO] running `Command { std: "docker" "inspect" "062af3f5f9a9d540d7f769aa3e2e9eeb053eb808621e36aaf8d70966a6c9ab9e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "062af3f5f9a9d540d7f769aa3e2e9eeb053eb808621e36aaf8d70966a6c9ab9e", kill_on_drop: false }`
[INFO] [stdout] 062af3f5f9a9d540d7f769aa3e2e9eeb053eb808621e36aaf8d70966a6c9ab9e