Oct 13 05:50:54.210 INFO checking 02alexander/maze-solver against try#4021bd0b3c5815b087d6db10ce461e7e4854ade7 for pr-54977
Oct 13 05:50:54.211 INFO running `"docker" "create" "-v" "/mnt/big/crater/./work/local/target-dirs/pr-54977/worker-5/try#4021bd0b3c5815b087d6db10ce461e7e4854ade7:/target:rw,Z" "-v" "/mnt/big/crater/./work/local/test-source/worker-5/pr-54977/try#4021bd0b3c5815b087d6db10ce461e7e4854ade7:/source:ro,Z" "-v" "/mnt/big/crater/./work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/./work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +4021bd0b3c5815b087d6db10ce461e7e4854ade7-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Oct 13 05:50:54.378 INFO blam! 57321dfbd6db5ae7079d135a4f8b7fd87312c099ca66038bc1e1d0699857d5dd
Oct 13 05:50:54.378 INFO running `"docker" "start" "-a" "57321dfbd6db5ae7079d135a4f8b7fd87312c099ca66038bc1e1d0699857d5dd"`
Oct 13 05:50:54.832 INFO kablam! usermod: no changes
Oct 13 05:50:54.869 INFO kablam!     Checking flate2 v0.2.20
Oct 13 05:50:55.978 INFO kablam!     Checking imagefmt v4.0.0
Oct 13 05:50:57.631 INFO kablam!     Checking maze-solver v0.1.0 (/source)
Oct 13 05:50:58.300 INFO kablam! warning: unused imports: `read`, `write`
Oct 13 05:50:58.301 INFO kablam!  --> src/main.rs:3:16
Oct 13 05:50:58.301 INFO kablam!   |
Oct 13 05:50:58.302 INFO kablam! 3 | use imagefmt::{read, write, ColFmt, ColType};
Oct 13 05:50:58.303 INFO kablam!   |                ^^^^  ^^^^^
Oct 13 05:50:58.303 INFO kablam!   |
Oct 13 05:50:58.304 INFO kablam!   = note: #[warn(unused_imports)] on by default
Oct 13 05:50:58.304 INFO kablam! 
Oct 13 05:50:58.305 INFO kablam! warning: unused import: `std::mem::drop`
Oct 13 05:50:58.306 INFO kablam!  --> src/tree.rs:2:5
Oct 13 05:50:58.306 INFO kablam!   |
Oct 13 05:50:58.307 INFO kablam! 2 | use std::mem::drop;
Oct 13 05:50:58.307 INFO kablam!   |     ^^^^^^^^^^^^^^
Oct 13 05:50:58.308 INFO kablam! 
Oct 13 05:50:58.312 INFO kablam! warning: unused import: `Node`
Oct 13 05:50:58.313 INFO kablam!  --> src/path_to_end.rs:3:35
Oct 13 05:50:58.313 INFO kablam!   |
Oct 13 05:50:58.314 INFO kablam! 3 | use super::tree::{QuaternaryTree, Node, Link};
Oct 13 05:50:58.315 INFO kablam!   |                                   ^^^^
Oct 13 05:50:58.315 INFO kablam! 
Oct 13 05:50:58.468 INFO kablam! warning: variable does not need to be mutable
Oct 13 05:50:58.468 INFO kablam!   --> src/tree.rs:41:8
Oct 13 05:50:58.468 INFO kablam!    |
Oct 13 05:50:58.468 INFO kablam! 41 |             let mut cur = &mut *next.take().unwrap();
Oct 13 05:50:58.468 INFO kablam!    |                 ----^^^
Oct 13 05:50:58.468 INFO kablam!    |                 |
Oct 13 05:50:58.468 INFO kablam!    |                 help: remove this `mut`
Oct 13 05:50:58.468 INFO kablam!    |
Oct 13 05:50:58.468 INFO kablam!    = note: #[warn(unused_mut)] on by default
Oct 13 05:50:58.468 INFO kablam! 
Oct 13 05:50:58.504 INFO kablam! warning: unused `std::result::Result` which must be used
Oct 13 05:50:58.504 INFO kablam!   --> src/main.rs:20:2
Oct 13 05:50:58.504 INFO kablam!    |
Oct 13 05:50:58.504 INFO kablam! 20 |     imagefmt::write("out.bmp", maze.width, maze.height, ColFmt::RGB, &pixels, ColType::Auto);
Oct 13 05:50:58.504 INFO kablam!    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 13 05:50:58.504 INFO kablam!    |
Oct 13 05:50:58.504 INFO kablam!    = note: #[warn(unused_must_use)] on by default
Oct 13 05:50:58.504 INFO kablam!    = note: this `Result` may be an `Err` variant, which should be handled
Oct 13 05:50:58.504 INFO kablam! 
Oct 13 05:50:58.548 INFO kablam! warning: unused imports: `read`, `write`
Oct 13 05:50:58.548 INFO kablam!  --> src/main.rs:3:16
Oct 13 05:50:58.548 INFO kablam!   |
Oct 13 05:50:58.548 INFO kablam! 3 | use imagefmt::{read, write, ColFmt, ColType};
Oct 13 05:50:58.548 INFO kablam!   |                ^^^^  ^^^^^
Oct 13 05:50:58.548 INFO kablam!   |
Oct 13 05:50:58.548 INFO kablam!   = note: #[warn(unused_imports)] on by default
Oct 13 05:50:58.548 INFO kablam! 
Oct 13 05:50:58.548 INFO kablam! warning: unused import: `std::mem::drop`
Oct 13 05:50:58.548 INFO kablam!  --> src/tree.rs:2:5
Oct 13 05:50:58.548 INFO kablam!   |
Oct 13 05:50:58.548 INFO kablam! 2 | use std::mem::drop;
Oct 13 05:50:58.548 INFO kablam!   |     ^^^^^^^^^^^^^^
Oct 13 05:50:58.548 INFO kablam! 
Oct 13 05:50:58.788 INFO kablam! warning: variable does not need to be mutable
Oct 13 05:50:58.789 INFO kablam!   --> src/tree.rs:41:8
Oct 13 05:50:58.789 INFO kablam!    |
Oct 13 05:50:58.789 INFO kablam! 41 |             let mut cur = &mut *next.take().unwrap();
Oct 13 05:50:58.789 INFO kablam!    |                 ----^^^
Oct 13 05:50:58.789 INFO kablam!    |                 |
Oct 13 05:50:58.790 INFO kablam!    |                 help: remove this `mut`
Oct 13 05:50:58.790 INFO kablam!    |
Oct 13 05:50:58.790 INFO kablam!    = note: #[warn(unused_mut)] on by default
Oct 13 05:50:58.790 INFO kablam! 
Oct 13 05:50:58.856 INFO kablam! warning: unused `std::result::Result` which must be used
Oct 13 05:50:58.856 INFO kablam!   --> src/main.rs:20:2
Oct 13 05:50:58.856 INFO kablam!    |
Oct 13 05:50:58.856 INFO kablam! 20 |     imagefmt::write("out.bmp", maze.width, maze.height, ColFmt::RGB, &pixels, ColType::Auto);
Oct 13 05:50:58.856 INFO kablam!    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 13 05:50:58.857 INFO kablam!    |
Oct 13 05:50:58.857 INFO kablam!    = note: #[warn(unused_must_use)] on by default
Oct 13 05:50:58.857 INFO kablam!    = note: this `Result` may be an `Err` variant, which should be handled
Oct 13 05:50:58.857 INFO kablam! 
Oct 13 05:50:58.881 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 4.03s
Oct 13 05:50:58.883 INFO kablam! su: No module specific data is present
Oct 13 05:50:59.292 INFO running `"docker" "rm" "-f" "57321dfbd6db5ae7079d135a4f8b7fd87312c099ca66038bc1e1d0699857d5dd"`
Oct 13 05:50:59.472 INFO blam! 57321dfbd6db5ae7079d135a4f8b7fd87312c099ca66038bc1e1d0699857d5dd