[INFO] cloning repository https://github.com/fahrenkrug/rust_learn_book_chapter_18
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/fahrenkrug/rust_learn_book_chapter_18" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffahrenkrug%2Frust_learn_book_chapter_18", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffahrenkrug%2Frust_learn_book_chapter_18'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 720cc6cfcf96683297fb2733f4b958d516e581bb
[INFO] checking fahrenkrug/rust_learn_book_chapter_18 against master#f4d794ea0b845413344621d89f6c945062748485 for pr-119369
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffahrenkrug%2Frust_learn_book_chapter_18" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/fahrenkrug/rust_learn_book_chapter_18 on toolchain f4d794ea0b845413344621d89f6c945062748485
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f4d794ea0b845413344621d89f6c945062748485" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/fahrenkrug/rust_learn_book_chapter_18
[INFO] finished tweaking git repo https://github.com/fahrenkrug/rust_learn_book_chapter_18
[INFO] tweaked toml for git repo https://github.com/fahrenkrug/rust_learn_book_chapter_18 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/fahrenkrug/rust_learn_book_chapter_18 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" "+f4d794ea0b845413344621d89f6c945062748485" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking fahrenkrug/rust_learn_book_chapter_18 against try#3832a95f57d4260fb5641e183906f49b4e5c6bdd for pr-119369
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffahrenkrug%2Frust_learn_book_chapter_18" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/fahrenkrug/rust_learn_book_chapter_18 on toolchain 3832a95f57d4260fb5641e183906f49b4e5c6bdd
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3832a95f57d4260fb5641e183906f49b4e5c6bdd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/fahrenkrug/rust_learn_book_chapter_18
[INFO] finished tweaking git repo https://github.com/fahrenkrug/rust_learn_book_chapter_18
[INFO] tweaked toml for git repo https://github.com/fahrenkrug/rust_learn_book_chapter_18 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/fahrenkrug/rust_learn_book_chapter_18 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" "+3832a95f57d4260fb5641e183906f49b4e5c6bdd" "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] checking fahrenkrug/rust_learn_book_chapter_18 against try#3832a95f57d4260fb5641e183906f49b4e5c6bdd for pr-119369
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffahrenkrug%2Frust_learn_book_chapter_18" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/fahrenkrug/rust_learn_book_chapter_18 on toolchain 3832a95f57d4260fb5641e183906f49b4e5c6bdd
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3832a95f57d4260fb5641e183906f49b4e5c6bdd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/fahrenkrug/rust_learn_book_chapter_18
[INFO] finished tweaking git repo https://github.com/fahrenkrug/rust_learn_book_chapter_18
[INFO] tweaked toml for git repo https://github.com/fahrenkrug/rust_learn_book_chapter_18 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/fahrenkrug/rust_learn_book_chapter_18 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" "+3832a95f57d4260fb5641e183906f49b4e5c6bdd" "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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+3832a95f57d4260fb5641e183906f49b4e5c6bdd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a82e4a9256a619525b405bab4ae9006b505472a1e79c0e1ce2a721dca16169e0
[INFO] running `Command { std: "docker" "start" "-a" "a82e4a9256a619525b405bab4ae9006b505472a1e79c0e1ce2a721dca16169e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a82e4a9256a619525b405bab4ae9006b505472a1e79c0e1ce2a721dca16169e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a82e4a9256a619525b405bab4ae9006b505472a1e79c0e1ce2a721dca16169e0", kill_on_drop: false }`
[INFO] [stdout] a82e4a9256a619525b405bab4ae9006b505472a1e79c0e1ce2a721dca16169e0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+3832a95f57d4260fb5641e183906f49b4e5c6bdd" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f7428fe476d5cb8e66954eb22fa0e76c01ff4f3e538fb9778976457fb2df4807
[INFO] running `Command { std: "docker" "start" "-a" "f7428fe476d5cb8e66954eb22fa0e76c01ff4f3e538fb9778976457fb2df4807", kill_on_drop: false }`
[INFO] [stderr]     Checking pattern_and_matching v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]   --> src/refutability.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 |     if let x = 5 {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]    = help: consider replacing the `if let` with a `let`
[INFO] [stdout]    = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]   --> src/refutability.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 |     if let x = 5 {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]    = help: consider replacing the `if let` with a `let`
[INFO] [stdout]    = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `first`
[INFO] [stdout]    --> src/pattern_syntax.rs:156:10
[INFO] [stdout]     |
[INFO] [stdout] 156 |         (first, _, third, _, fifth) => {
[INFO] [stdout]     |          ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `first`
[INFO] [stdout]    --> src/pattern_syntax.rs:156:10
[INFO] [stdout]     |
[INFO] [stdout] 156 |         (first, _, third, _, fifth) => {
[INFO] [stdout]     |          ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stdout]   --> src/pattern_syntax.rs:91:5
[INFO] [stdout]    |
[INFO] [stdout] 90 | enum Message {
[INFO] [stdout]    |      ------- variants in this enum
[INFO] [stdout] 91 |     Quit,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 92 |     Move {x: i32, y: i32},
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 93 |     Write(String),
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Rgb` is never constructed
[INFO] [stdout]    --> src/pattern_syntax.rs:113:5
[INFO] [stdout]     |
[INFO] [stdout] 112 | enum Color {
[INFO] [stdout]     |      ----- variant in this enum
[INFO] [stdout] 113 |     Rgb(i32, i32, i32),
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stdout]    --> src/pattern_syntax.rs:118:5
[INFO] [stdout]     |
[INFO] [stdout] 117 | enum Message2 {
[INFO] [stdout]     |      -------- variants in this enum
[INFO] [stdout] 118 |     Quit,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 119 |     Move {x: i32, y: i32},
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 120 |     Write(String),
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `y` and `z` are never read
[INFO] [stdout]    --> src/pattern_syntax.rs:187:5
[INFO] [stdout]     |
[INFO] [stdout] 185 | struct ThreeDimensionPoint {
[INFO] [stdout]     |        ------------------- fields in this struct
[INFO] [stdout] 186 |     x: i32,
[INFO] [stdout] 187 |     y: i32,
[INFO] [stdout]     |     ^
[INFO] [stdout] 188 |     z: i32,
[INFO] [stdout]     |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stdout]   --> src/pattern_syntax.rs:91:5
[INFO] [stdout]    |
[INFO] [stdout] 90 | enum Message {
[INFO] [stdout]    |      ------- variants in this enum
[INFO] [stdout] 91 |     Quit,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 92 |     Move {x: i32, y: i32},
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 93 |     Write(String),
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Rgb` is never constructed
[INFO] [stdout]    --> src/pattern_syntax.rs:113:5
[INFO] [stdout]     |
[INFO] [stdout] 112 | enum Color {
[INFO] [stdout]     |      ----- variant in this enum
[INFO] [stdout] 113 |     Rgb(i32, i32, i32),
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stdout]    --> src/pattern_syntax.rs:118:5
[INFO] [stdout]     |
[INFO] [stdout] 117 | enum Message2 {
[INFO] [stdout]     |      -------- variants in this enum
[INFO] [stdout] 118 |     Quit,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 119 |     Move {x: i32, y: i32},
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 120 |     Write(String),
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `y` and `z` are never read
[INFO] [stdout]    --> src/pattern_syntax.rs:187:5
[INFO] [stdout]     |
[INFO] [stdout] 185 | struct ThreeDimensionPoint {
[INFO] [stdout]     |        ------------------- fields in this struct
[INFO] [stdout] 186 |     x: i32,
[INFO] [stdout] 187 |     y: i32,
[INFO] [stdout]     |     ^
[INFO] [stdout] 188 |     z: i32,
[INFO] [stdout]     |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.11s
[INFO] running `Command { std: "docker" "inspect" "f7428fe476d5cb8e66954eb22fa0e76c01ff4f3e538fb9778976457fb2df4807", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f7428fe476d5cb8e66954eb22fa0e76c01ff4f3e538fb9778976457fb2df4807", kill_on_drop: false }`
[INFO] [stdout] f7428fe476d5cb8e66954eb22fa0e76c01ff4f3e538fb9778976457fb2df4807