[INFO] cloning repository https://github.com/Nalleyer/rust_99_problem
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Nalleyer/rust_99_problem" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNalleyer%2Frust_99_problem", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNalleyer%2Frust_99_problem'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 963a80b26b71b2cb375922c8d99b1096e715d0e5
[INFO] checking Nalleyer/rust_99_problem against master#dc375db7d8df0aa450e622c529147c95eee756f5 for pr-156749
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNalleyer%2Frust_99_problem" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Nalleyer/rust_99_problem
[INFO] finished tweaking git repo https://github.com/Nalleyer/rust_99_problem
[INFO] tweaked toml for git repo https://github.com/Nalleyer/rust_99_problem written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Nalleyer/rust_99_problem on toolchain dc375db7d8df0aa450e622c529147c95eee756f5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dc375db7d8df0aa450e622c529147c95eee756f5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Nalleyer/rust_99_problem 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" "+dc375db7d8df0aa450e622c529147c95eee756f5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded quickcheck v0.8.2
[INFO] [stderr]   Downloaded quickcheck_macros v0.8.0
[INFO] [stderr]   Downloaded quote v0.6.11
[INFO] [stderr]   Downloaded syn v0.15.29
[INFO] [stderr]   Downloaded regex v1.1.2
[INFO] [stderr]   Downloaded regex-syntax v0.6.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3e793bdf10248eb2ddbd6b0faebed8155c11b4589982e2893733958d93e8d540" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] b90686196b0c460d3bcd60d766b51e92460ec11d57bc3b775893d989f27d24c3
[INFO] running `Command { std: "docker" "start" "b90686196b0c460d3bcd60d766b51e92460ec11d57bc3b775893d989f27d24c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "b90686196b0c460d3bcd60d766b51e92460ec11d57bc3b775893d989f27d24c3" "/opt/rustwide/cargo-home/bin/cargo" "+dc375db7d8df0aa450e622c529147c95eee756f5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b90686196b0c460d3bcd60d766b51e92460ec11d57bc3b775893d989f27d24c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "b90686196b0c460d3bcd60d766b51e92460ec11d57bc3b775893d989f27d24c3" "/opt/rustwide/cargo-home/bin/cargo" "+dc375db7d8df0aa450e622c529147c95eee756f5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.50
[INFO] [stderr]    Compiling proc-macro2 v0.4.27
[INFO] [stderr]    Compiling regex v1.1.2
[INFO] [stderr]     Checking regex-syntax v0.6.5
[INFO] [stderr]     Checking aho-corasick v0.6.10
[INFO] [stderr]    Compiling syn v0.15.29
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]    Compiling quote v0.6.11
[INFO] [stderr]     Checking env_logger v0.6.1
[INFO] [stderr]     Checking quickcheck v0.8.2
[INFO] [stderr]    Compiling quickcheck_macros v0.8.0
[INFO] [stderr]     Checking rust_99_problem v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/solves/p7.rs:14:24
[INFO] [stdout]    |
[INFO] [stdout] 14 |             Node::Item(x) => vec!(node.clone()),
[INFO] [stdout]    |                        ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `is_item`
[INFO] [stdout]   --> src/common.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |         let is_item: bool = g.gen();
[INFO] [stdout]    |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_is_item`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `flat` is never used
[INFO] [stdout]   --> src/solves/p7.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn flat<T: Clone>(ls: &List<T>) -> List<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Node` is never used
[INFO] [stdout]  --> src/common.rs:2:10
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub enum Node<T> {
[INFO] [stdout]   |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `List` is never used
[INFO] [stdout]  --> src/common.rs:7:10
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub type List<T> = Vec<Node<T>>;
[INFO] [stdout]   |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `arbitrary_node` is never used
[INFO] [stdout]   --> src/common.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn arbitrary_node<G, T>(g: &mut G, size: usize) -> Node<T> 
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `arbitrary_vec` is never used
[INFO] [stdout]   --> src/common.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn arbitrary_vec<G, T>(g: &mut G, size: usize) -> List<T>
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/main.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | #[macro_use(quickcheck)]
[INFO] [stdout]   |             ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/solves/p7.rs:14:24
[INFO] [stdout]    |
[INFO] [stdout] 14 |             Node::Item(x) => vec!(node.clone()),
[INFO] [stdout]    |                        ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `is_item`
[INFO] [stdout]   --> src/common.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |         let is_item: bool = g.gen();
[INFO] [stdout]    |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_is_item`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.33s
[INFO] running `Command { std: "docker" "inspect" "b90686196b0c460d3bcd60d766b51e92460ec11d57bc3b775893d989f27d24c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b90686196b0c460d3bcd60d766b51e92460ec11d57bc3b775893d989f27d24c3", kill_on_drop: false }`
[INFO] [stdout] b90686196b0c460d3bcd60d766b51e92460ec11d57bc3b775893d989f27d24c3
