[INFO] cloning repository https://github.com/dokenedgar/chapter-8-rust-book-common-collections
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dokenedgar/chapter-8-rust-book-common-collections" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdokenedgar%2Fchapter-8-rust-book-common-collections", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdokenedgar%2Fchapter-8-rust-book-common-collections'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d0956fe3329bb0057abfecdc9bf42d446cf202a5
[INFO] testing dokenedgar/chapter-8-rust-book-common-collections against try#7af779037716ae4125ceabb429791b4cf5dd0a43 for pr-136932
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdokenedgar%2Fchapter-8-rust-book-common-collections" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dokenedgar/chapter-8-rust-book-common-collections on toolchain 7af779037716ae4125ceabb429791b4cf5dd0a43
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7af779037716ae4125ceabb429791b4cf5dd0a43" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/dokenedgar/chapter-8-rust-book-common-collections
[INFO] finished tweaking git repo https://github.com/dokenedgar/chapter-8-rust-book-common-collections
[INFO] tweaked toml for git repo https://github.com/dokenedgar/chapter-8-rust-book-common-collections written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/dokenedgar/chapter-8-rust-book-common-collections 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" "+7af779037716ae4125ceabb429791b4cf5dd0a43" "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
[ERROR] error running command: no output for 300 seconds
[INFO] testing dokenedgar/chapter-8-rust-book-common-collections against try#7af779037716ae4125ceabb429791b4cf5dd0a43 for pr-136932
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdokenedgar%2Fchapter-8-rust-book-common-collections" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dokenedgar/chapter-8-rust-book-common-collections on toolchain 7af779037716ae4125ceabb429791b4cf5dd0a43
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7af779037716ae4125ceabb429791b4cf5dd0a43" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/dokenedgar/chapter-8-rust-book-common-collections
[INFO] finished tweaking git repo https://github.com/dokenedgar/chapter-8-rust-book-common-collections
[INFO] tweaked toml for git repo https://github.com/dokenedgar/chapter-8-rust-book-common-collections written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/dokenedgar/chapter-8-rust-book-common-collections 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" "+7af779037716ae4125ceabb429791b4cf5dd0a43" "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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+7af779037716ae4125ceabb429791b4cf5dd0a43" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8c26143dc2af5d9e34dec5056513410ea2b959e64b915148488ac91649165f86
[INFO] running `Command { std: "docker" "start" "-a" "8c26143dc2af5d9e34dec5056513410ea2b959e64b915148488ac91649165f86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8c26143dc2af5d9e34dec5056513410ea2b959e64b915148488ac91649165f86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c26143dc2af5d9e34dec5056513410ea2b959e64b915148488ac91649165f86", kill_on_drop: false }`
[INFO] [stdout] 8c26143dc2af5d9e34dec5056513410ea2b959e64b915148488ac91649165f86
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+7af779037716ae4125ceabb429791b4cf5dd0a43" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8633c9f151e7fefb2324390a8bb5e1e534d7e67ec4f5d793698499f661a230d9
[INFO] running `Command { std: "docker" "start" "-a" "8633c9f151e7fefb2324390a8bb5e1e534d7e67ec4f5d793698499f661a230d9", kill_on_drop: false }`
[INFO] [stderr]    Compiling chapter-8-rust-book-common-collections v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]   --> src/number_one.rs:20:17
[INFO] [stdout]    |
[INFO] [stdout] 20 |         let mut count = 0;
[INFO] [stdout]    |                 ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `result` is never read
[INFO] [stdout]  --> src/number_two.rs:9:13
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let mut result: String = String::new();
[INFO] [stdout]   |             ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.21s
[INFO] running `Command { std: "docker" "inspect" "8633c9f151e7fefb2324390a8bb5e1e534d7e67ec4f5d793698499f661a230d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8633c9f151e7fefb2324390a8bb5e1e534d7e67ec4f5d793698499f661a230d9", kill_on_drop: false }`
[INFO] [stdout] 8633c9f151e7fefb2324390a8bb5e1e534d7e67ec4f5d793698499f661a230d9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+7af779037716ae4125ceabb429791b4cf5dd0a43" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 99efc334437cfa63c08d3dc58b121e44cd3ce6ca4baf1f530318cd3d085e0201
[INFO] running `Command { std: "docker" "start" "-a" "99efc334437cfa63c08d3dc58b121e44cd3ce6ca4baf1f530318cd3d085e0201", kill_on_drop: false }`
[INFO] [stderr]    Compiling chapter-8-rust-book-common-collections v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]   --> src/number_one.rs:20:17
[INFO] [stdout]    |
[INFO] [stdout] 20 |         let mut count = 0;
[INFO] [stdout]    |                 ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `result` is never read
[INFO] [stdout]  --> src/number_two.rs:9:13
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let mut result: String = String::new();
[INFO] [stdout]   |             ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.08s
[INFO] running `Command { std: "docker" "inspect" "99efc334437cfa63c08d3dc58b121e44cd3ce6ca4baf1f530318cd3d085e0201", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "99efc334437cfa63c08d3dc58b121e44cd3ce6ca4baf1f530318cd3d085e0201", kill_on_drop: false }`
[INFO] [stdout] 99efc334437cfa63c08d3dc58b121e44cd3ce6ca4baf1f530318cd3d085e0201
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+7af779037716ae4125ceabb429791b4cf5dd0a43" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 87d52a302ab4fc19c1cbf6689fcc48f851ee1dcc256c04fb6390fe239a819fd1
[INFO] running `Command { std: "docker" "start" "-a" "87d52a302ab4fc19c1cbf6689fcc48f851ee1dcc256c04fb6390fe239a819fd1", kill_on_drop: false }`
[INFO] [stderr] warning: value assigned to `count` is never read
[INFO] [stderr]   --> src/number_one.rs:20:17
[INFO] [stderr]    |
[INFO] [stderr] 20 |         let mut count = 0;
[INFO] [stderr]    |                 ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `result` is never read
[INFO] [stderr]  --> src/number_two.rs:9:13
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let mut result: String = String::new();
[INFO] [stderr]   |             ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: `chapter-8-rust-book-common-collections` (bin "chapter-8-rust-book-common-collections" test) generated 2 warnings
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.00s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/chapter_8_rust_book_common_collections-6c3041cbddc6073c)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "87d52a302ab4fc19c1cbf6689fcc48f851ee1dcc256c04fb6390fe239a819fd1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87d52a302ab4fc19c1cbf6689fcc48f851ee1dcc256c04fb6390fe239a819fd1", kill_on_drop: false }`
[INFO] [stdout] 87d52a302ab4fc19c1cbf6689fcc48f851ee1dcc256c04fb6390fe239a819fd1