[INFO] cloning repository https://github.com/zasekle/rust_book_chapter_15
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zasekle/rust_book_chapter_15" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzasekle%2Frust_book_chapter_15", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzasekle%2Frust_book_chapter_15'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2986b73e0fc71db8b4a90b2695bf72936b74fa5f
[INFO] checking zasekle/rust_book_chapter_15 against master#3139ff09e9d07f7700f8d15ed25a231e29c43627 for pr-121848-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzasekle%2Frust_book_chapter_15" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/zasekle/rust_book_chapter_15 on toolchain 3139ff09e9d07f7700f8d15ed25a231e29c43627
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3139ff09e9d07f7700f8d15ed25a231e29c43627" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/zasekle/rust_book_chapter_15
[INFO] finished tweaking git repo https://github.com/zasekle/rust_book_chapter_15
[INFO] tweaked toml for git repo https://github.com/zasekle/rust_book_chapter_15 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/zasekle/rust_book_chapter_15 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" "+3139ff09e9d07f7700f8d15ed25a231e29c43627" "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 zasekle/rust_book_chapter_15 against try#a2cff3b7a9661c90ec0d581d3f3a69bb97c11138 for pr-121848-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzasekle%2Frust_book_chapter_15" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/zasekle/rust_book_chapter_15 on toolchain a2cff3b7a9661c90ec0d581d3f3a69bb97c11138
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a2cff3b7a9661c90ec0d581d3f3a69bb97c11138" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/zasekle/rust_book_chapter_15
[INFO] finished tweaking git repo https://github.com/zasekle/rust_book_chapter_15
[INFO] tweaked toml for git repo https://github.com/zasekle/rust_book_chapter_15 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/zasekle/rust_book_chapter_15 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" "+a2cff3b7a9661c90ec0d581d3f3a69bb97c11138" "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 zasekle/rust_book_chapter_15 against try#a2cff3b7a9661c90ec0d581d3f3a69bb97c11138 for pr-121848-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzasekle%2Frust_book_chapter_15" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/zasekle/rust_book_chapter_15 on toolchain a2cff3b7a9661c90ec0d581d3f3a69bb97c11138
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a2cff3b7a9661c90ec0d581d3f3a69bb97c11138" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/zasekle/rust_book_chapter_15
[INFO] finished tweaking git repo https://github.com/zasekle/rust_book_chapter_15
[INFO] tweaked toml for git repo https://github.com/zasekle/rust_book_chapter_15 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/zasekle/rust_book_chapter_15 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" "+a2cff3b7a9661c90ec0d581d3f3a69bb97c11138" "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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+a2cff3b7a9661c90ec0d581d3f3a69bb97c11138" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cb9bd6a9480b8cae87a89771445aa58b7806708e9153038398c0c2d7b02e22ff
[INFO] running `Command { std: "docker" "start" "-a" "cb9bd6a9480b8cae87a89771445aa58b7806708e9153038398c0c2d7b02e22ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cb9bd6a9480b8cae87a89771445aa58b7806708e9153038398c0c2d7b02e22ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cb9bd6a9480b8cae87a89771445aa58b7806708e9153038398c0c2d7b02e22ff", kill_on_drop: false }`
[INFO] [stdout] cb9bd6a9480b8cae87a89771445aa58b7806708e9153038398c0c2d7b02e22ff
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+a2cff3b7a9661c90ec0d581d3f3a69bb97c11138" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fe2b529e6340d52f26ba601f38652b337565a352b4f76c38717acceeaa779ef8
[INFO] running `Command { std: "docker" "start" "-a" "fe2b529e6340d52f26ba601f38652b337565a352b4f76c38717acceeaa779ef8", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_book_chapter_15 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:178:9
[INFO] [stdout]     |
[INFO] [stdout] 178 |     let mut a = Rc::new(String::from("String value"));
[INFO] [stdout]     |         ----^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:178:9
[INFO] [stdout]     |
[INFO] [stdout] 178 |     let mut a = Rc::new(String::from("String value"));
[INFO] [stdout]     |         ----^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:298:9
[INFO] [stdout]     |
[INFO] [stdout] 298 |     let mut weak_fails: Weak<i32>;
[INFO] [stdout]     |         ----^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:57:15
[INFO] [stdout]    |
[INFO] [stdout] 57 |         Hello(Box<HelloEnum>),
[INFO] [stdout]    |         ----- ^^^^^^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `HelloEnum` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 57 |         Hello(()),
[INFO] [stdout]    |               ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `side` is never read
[INFO] [stdout]    --> src/main.rs:129:9
[INFO] [stdout]     |
[INFO] [stdout] 128 |     struct Square {
[INFO] [stdout]     |            ------ field in this struct
[INFO] [stdout] 129 |         side: isize,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Square` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:298:9
[INFO] [stdout]     |
[INFO] [stdout] 298 |     let mut weak_fails: Weak<i32>;
[INFO] [stdout]     |         ----^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:57:15
[INFO] [stdout]    |
[INFO] [stdout] 57 |         Hello(Box<HelloEnum>),
[INFO] [stdout]    |         ----- ^^^^^^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `HelloEnum` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 57 |         Hello(()),
[INFO] [stdout]    |               ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `side` is never read
[INFO] [stdout]    --> src/main.rs:129:9
[INFO] [stdout]     |
[INFO] [stdout] 128 |     struct Square {
[INFO] [stdout]     |            ------ field in this struct
[INFO] [stdout] 129 |         side: isize,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Square` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.10s
[INFO] running `Command { std: "docker" "inspect" "fe2b529e6340d52f26ba601f38652b337565a352b4f76c38717acceeaa779ef8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fe2b529e6340d52f26ba601f38652b337565a352b4f76c38717acceeaa779ef8", kill_on_drop: false }`
[INFO] [stdout] fe2b529e6340d52f26ba601f38652b337565a352b4f76c38717acceeaa779ef8
