[INFO] cloning repository https://github.com/MaderNoob/nonogram-solver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/MaderNoob/nonogram-solver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMaderNoob%2Fnonogram-solver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMaderNoob%2Fnonogram-solver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 89884cfc9f60e19a3e2c2202b2d7252b49643e55
[INFO] testing MaderNoob/nonogram-solver against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMaderNoob%2Fnonogram-solver" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MaderNoob/nonogram-solver on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/MaderNoob/nonogram-solver
[INFO] finished tweaking git repo https://github.com/MaderNoob/nonogram-solver
[INFO] tweaked toml for git repo https://github.com/MaderNoob/nonogram-solver written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/MaderNoob/nonogram-solver already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b01ecec36ab0becaf3bbdc751b43e53548d8591aab2440096178f90e30c39643
[INFO] running `Command { std: "docker" "start" "-a" "b01ecec36ab0becaf3bbdc751b43e53548d8591aab2440096178f90e30c39643", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b01ecec36ab0becaf3bbdc751b43e53548d8591aab2440096178f90e30c39643", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b01ecec36ab0becaf3bbdc751b43e53548d8591aab2440096178f90e30c39643", kill_on_drop: false }`
[INFO] [stdout] b01ecec36ab0becaf3bbdc751b43e53548d8591aab2440096178f90e30c39643
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ff769d607d29d9b74bf7ff4998526e7dc11ef853a958d4847aa9ca8197553b39
[INFO] running `Command { std: "docker" "start" "-a" "ff769d607d29d9b74bf7ff4998526e7dc11ef853a958d4847aa9ca8197553b39", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.82
[INFO] [stderr]    Compiling log v0.4.13
[INFO] [stderr]    Compiling syn v1.0.58
[INFO] [stderr]    Compiling serde_derive v1.0.120
[INFO] [stderr]    Compiling serde v1.0.120
[INFO] [stderr]    Compiling serde_json v1.0.61
[INFO] [stderr]    Compiling array2d v0.2.1
[INFO] [stderr]    Compiling base64 v0.10.1
[INFO] [stderr]    Compiling base64 v0.9.3
[INFO] [stderr]    Compiling generic-array v0.12.3
[INFO] [stderr]    Compiling block-buffer v0.7.3
[INFO] [stderr]    Compiling digest v0.8.1
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling sha-1 v0.8.2
[INFO] [stderr]    Compiling mime v0.2.6
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling time v0.1.43
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling hyper v0.10.16
[INFO] [stderr]    Compiling websocket-base v0.26.2
[INFO] [stderr]    Compiling websocket v0.26.2
[INFO] [stderr]    Compiling first_try v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `core::panic`
[INFO] [stdout]  --> src/solver.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use core::panic;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `TcpListener`, `io::Read`
[INFO] [stdout]  --> src/solver.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     io::Read,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 4 |     net::{TcpListener, TcpStream},
[INFO] [stdout]   |           ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `serde::__private::ser`
[INFO] [stdout]  --> src/solver.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use serde::__private::ser;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Server`, `server::NoTlsAcceptor`
[INFO] [stdout]   --> src/solver.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     server::NoTlsAcceptor,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 11 |     sync::{Client, Server},
[INFO] [stdout]    |                    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/solver.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn new() -> ColumnBlockState {
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `construct_board_from_columns`
[INFO] [stdout]    --> src/solver.rs:388:8
[INFO] [stdout]     |
[INFO] [stdout] 388 |     fn construct_board_from_columns(&self) -> Array2D<char> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 27.76s
[INFO] running `Command { std: "docker" "inspect" "ff769d607d29d9b74bf7ff4998526e7dc11ef853a958d4847aa9ca8197553b39", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff769d607d29d9b74bf7ff4998526e7dc11ef853a958d4847aa9ca8197553b39", kill_on_drop: false }`
[INFO] [stdout] ff769d607d29d9b74bf7ff4998526e7dc11ef853a958d4847aa9ca8197553b39
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5eaa087fbc28f533439bb32edd206e679daac76012a0833730a17665c6bee4bc
[INFO] running `Command { std: "docker" "start" "-a" "5eaa087fbc28f533439bb32edd206e679daac76012a0833730a17665c6bee4bc", kill_on_drop: false }`
[INFO] [stderr]    Compiling first_try v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `core::panic`
[INFO] [stdout]  --> src/solver.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use core::panic;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `TcpListener`, `io::Read`
[INFO] [stdout]  --> src/solver.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     io::Read,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 4 |     net::{TcpListener, TcpStream},
[INFO] [stdout]   |           ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `serde::__private::ser`
[INFO] [stdout]  --> src/solver.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use serde::__private::ser;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Server`, `server::NoTlsAcceptor`
[INFO] [stdout]   --> src/solver.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     server::NoTlsAcceptor,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 11 |     sync::{Client, Server},
[INFO] [stdout]    |                    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/solver.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn new() -> ColumnBlockState {
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `construct_board_from_columns`
[INFO] [stdout]    --> src/solver.rs:388:8
[INFO] [stdout]     |
[INFO] [stdout] 388 |     fn construct_board_from_columns(&self) -> Array2D<char> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.00s
[INFO] running `Command { std: "docker" "inspect" "5eaa087fbc28f533439bb32edd206e679daac76012a0833730a17665c6bee4bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5eaa087fbc28f533439bb32edd206e679daac76012a0833730a17665c6bee4bc", kill_on_drop: false }`
[INFO] [stdout] 5eaa087fbc28f533439bb32edd206e679daac76012a0833730a17665c6bee4bc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] b85ffb354c37f11f50b59940f3e798ea44900b15bd064d7af36691331d9c65a9
[INFO] running `Command { std: "docker" "start" "-a" "b85ffb354c37f11f50b59940f3e798ea44900b15bd064d7af36691331d9c65a9", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: unused import: `core::panic`
[INFO] [stdout] running 0 tests
[INFO] [stderr]  --> src/solver.rs:1:5
[INFO] [stdout] 
[INFO] [stderr]   |
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr] 1 | use core::panic;
[INFO] [stdout] 
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `TcpListener`, `io::Read`
[INFO] [stderr]  --> src/solver.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     io::Read,
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 4 |     net::{TcpListener, TcpStream},
[INFO] [stderr]   |           ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `serde::__private::ser`
[INFO] [stderr]  --> src/solver.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use serde::__private::ser;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Server`, `server::NoTlsAcceptor`
[INFO] [stderr]   --> src/solver.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     server::NoTlsAcceptor,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 11 |     sync::{Client, Server},
[INFO] [stderr]    |                    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/solver.rs:25:12
[INFO] [stderr]    |
[INFO] [stderr] 25 |     pub fn new() -> ColumnBlockState {
[INFO] [stderr]    |            ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `construct_board_from_columns`
[INFO] [stderr]    --> src/solver.rs:388:8
[INFO] [stderr]     |
[INFO] [stderr] 388 |     fn construct_board_from_columns(&self) -> Array2D<char> {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `first_try` (bin "first_try" test) generated 6 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/first_try-9b7676580f24191c)
[INFO] running `Command { std: "docker" "inspect" "b85ffb354c37f11f50b59940f3e798ea44900b15bd064d7af36691331d9c65a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b85ffb354c37f11f50b59940f3e798ea44900b15bd064d7af36691331d9c65a9", kill_on_drop: false }`
[INFO] [stdout] b85ffb354c37f11f50b59940f3e798ea44900b15bd064d7af36691331d9c65a9