[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 try#7df376b035b3d12ff0386ad8b45b76dbe020257b for pr-142712
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffahrenkrug%2Frust_learn_book_chapter_18" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[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-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/fahrenkrug/rust_learn_book_chapter_18 on toolchain 7df376b035b3d12ff0386ad8b45b76dbe020257b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7df376b035b3d12ff0386ad8b45b76dbe020257b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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" "+7df376b035b3d12ff0386ad8b45b76dbe020257b" "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-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+7df376b035b3d12ff0386ad8b45b76dbe020257b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 574802b47a83453fc7888295d770b1d6b2ee3a5674e73ac9696b37b079405351
[INFO] running `Command { std: "docker" "start" "-a" "574802b47a83453fc7888295d770b1d6b2ee3a5674e73ac9696b37b079405351", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "574802b47a83453fc7888295d770b1d6b2ee3a5674e73ac9696b37b079405351", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "574802b47a83453fc7888295d770b1d6b2ee3a5674e73ac9696b37b079405351", kill_on_drop: false }`
[INFO] [stdout] 574802b47a83453fc7888295d770b1d6b2ee3a5674e73ac9696b37b079405351
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+7df376b035b3d12ff0386ad8b45b76dbe020257b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 34bf075687856e52e62f287ec7c0f2a22b4ab75caef67284ab49ece87c8c963d
[INFO] running `Command { std: "docker" "start" "-a" "34bf075687856e52e62f287ec7c0f2a22b4ab75caef67284ab49ece87c8c963d", 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: 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: 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: 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: 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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.13s
[INFO] running `Command { std: "docker" "inspect" "34bf075687856e52e62f287ec7c0f2a22b4ab75caef67284ab49ece87c8c963d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "34bf075687856e52e62f287ec7c0f2a22b4ab75caef67284ab49ece87c8c963d", kill_on_drop: false }`
[INFO] [stdout] 34bf075687856e52e62f287ec7c0f2a22b4ab75caef67284ab49ece87c8c963d