Dec 18 17:00:22.652 INFO checking disjoint-set-0.0.2 against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 17:00:22.652 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-0/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/reg/disjoint-set/0.0.2:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 17:00:22.844 INFO [stdout] 6b0dd5043fd924160b1f4bb95c1cc39307d0e250bd1b4888ea15d564aa86f62d
Dec 18 17:00:22.846 INFO running `"docker" "start" "-a" "6b0dd5043fd924160b1f4bb95c1cc39307d0e250bd1b4888ea15d564aa86f62d"`
Dec 18 17:00:23.555 INFO [stderr]     Checking disjoint-set v0.0.2 (/opt/crater/workdir)
Dec 18 17:00:23.840 INFO [stderr] warning: unused import: `std::rc::Rc`
Dec 18 17:00:23.840 INFO [stderr]  --> src/lib.rs:3:5
Dec 18 17:00:23.840 INFO [stderr]   |
Dec 18 17:00:23.840 INFO [stderr] 3 | use std::rc::Rc;
Dec 18 17:00:23.840 INFO [stderr]   |     ^^^^^^^^^^^
Dec 18 17:00:23.840 INFO [stderr]   |
Dec 18 17:00:23.840 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 18 17:00:23.840 INFO [stderr] 
Dec 18 17:00:23.860 INFO [stderr] warning: unused variable: `p`
Dec 18 17:00:23.860 INFO [stderr]   --> src/lib.rs:37:18
Dec 18 17:00:23.860 INFO [stderr]    |
Dec 18 17:00:23.860 INFO [stderr] 37 |             Some(p) => return,
Dec 18 17:00:23.860 INFO [stderr]    |                  ^ help: consider using `_p` instead
Dec 18 17:00:23.860 INFO [stderr]    |
Dec 18 17:00:23.860 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 18 17:00:23.860 INFO [stderr] 
Dec 18 17:00:23.868 INFO [stderr] warning: variable does not need to be mutable
Dec 18 17:00:23.868 INFO [stderr]   --> src/lib.rs:35:13
Dec 18 17:00:23.868 INFO [stderr]    |
Dec 18 17:00:23.868 INFO [stderr] 35 |         let mut len = &mut self.set_size;
Dec 18 17:00:23.868 INFO [stderr]    |             ----^^^
Dec 18 17:00:23.868 INFO [stderr]    |             |
Dec 18 17:00:23.868 INFO [stderr]    |             help: remove this `mut`
Dec 18 17:00:23.868 INFO [stderr]    |
Dec 18 17:00:23.868 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 17:00:23.868 INFO [stderr] 
Dec 18 17:00:23.868 INFO [stderr] warning: variable does not need to be mutable
Dec 18 17:00:23.868 INFO [stderr]   --> src/lib.rs:53:13
Dec 18 17:00:23.868 INFO [stderr]    |
Dec 18 17:00:23.868 INFO [stderr] 53 |         let mut pos: usize;
Dec 18 17:00:23.868 INFO [stderr]    |             ----^^^
Dec 18 17:00:23.868 INFO [stderr]    |             |
Dec 18 17:00:23.868 INFO [stderr]    |             help: remove this `mut`
Dec 18 17:00:23.868 INFO [stderr] 
Dec 18 17:00:23.868 INFO [stderr] warning: variant is never constructed: `Root`
Dec 18 17:00:23.868 INFO [stderr]  --> src/lib.rs:7:5
Dec 18 17:00:23.868 INFO [stderr]   |
Dec 18 17:00:23.868 INFO [stderr] 7 |     Root(ValueType, u32),
Dec 18 17:00:23.868 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
Dec 18 17:00:23.868 INFO [stderr]   |
Dec 18 17:00:23.869 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 18 17:00:23.869 INFO [stderr] 
Dec 18 17:00:23.869 INFO [stderr] warning: variant is never constructed: `Link`
Dec 18 17:00:23.869 INFO [stderr]  --> src/lib.rs:8:5
Dec 18 17:00:23.869 INFO [stderr]   |
Dec 18 17:00:23.869 INFO [stderr] 8 |     Link(Box<SetItem<ValueType>>)
Dec 18 17:00:23.869 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 17:00:23.869 INFO [stderr] 
Dec 18 17:00:23.869 INFO [stderr] warning: unused import: `std::rc::Rc`
Dec 18 17:00:23.869 INFO [stderr]  --> src/lib.rs:3:5
Dec 18 17:00:23.869 INFO [stderr]   |
Dec 18 17:00:23.869 INFO [stderr] 3 | use std::rc::Rc;
Dec 18 17:00:23.869 INFO [stderr]   |     ^^^^^^^^^^^
Dec 18 17:00:23.869 INFO [stderr]   |
Dec 18 17:00:23.869 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 18 17:00:23.869 INFO [stderr] 
Dec 18 17:00:23.904 INFO [stderr] warning: unused variable: `p`
Dec 18 17:00:23.904 INFO [stderr]   --> src/lib.rs:37:18
Dec 18 17:00:23.904 INFO [stderr]    |
Dec 18 17:00:23.905 INFO [stderr] 37 |             Some(p) => return,
Dec 18 17:00:23.905 INFO [stderr]    |                  ^ help: consider using `_p` instead
Dec 18 17:00:23.905 INFO [stderr]    |
Dec 18 17:00:23.905 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 18 17:00:23.905 INFO [stderr] 
Dec 18 17:00:23.908 INFO [stderr] warning: variable does not need to be mutable
Dec 18 17:00:23.908 INFO [stderr]   --> src/lib.rs:35:13
Dec 18 17:00:23.908 INFO [stderr]    |
Dec 18 17:00:23.908 INFO [stderr] 35 |         let mut len = &mut self.set_size;
Dec 18 17:00:23.908 INFO [stderr]    |             ----^^^
Dec 18 17:00:23.908 INFO [stderr]    |             |
Dec 18 17:00:23.908 INFO [stderr]    |             help: remove this `mut`
Dec 18 17:00:23.908 INFO [stderr]    |
Dec 18 17:00:23.908 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 17:00:23.908 INFO [stderr] 
Dec 18 17:00:23.908 INFO [stderr] warning: variable does not need to be mutable
Dec 18 17:00:23.908 INFO [stderr]   --> src/lib.rs:53:13
Dec 18 17:00:23.908 INFO [stderr]    |
Dec 18 17:00:23.908 INFO [stderr] 53 |         let mut pos: usize;
Dec 18 17:00:23.908 INFO [stderr]    |             ----^^^
Dec 18 17:00:23.908 INFO [stderr]    |             |
Dec 18 17:00:23.908 INFO [stderr]    |             help: remove this `mut`
Dec 18 17:00:23.908 INFO [stderr] 
Dec 18 17:00:23.915 INFO [stderr] warning: variant is never constructed: `Root`
Dec 18 17:00:23.915 INFO [stderr]  --> src/lib.rs:7:5
Dec 18 17:00:23.915 INFO [stderr]   |
Dec 18 17:00:23.915 INFO [stderr] 7 |     Root(ValueType, u32),
Dec 18 17:00:23.915 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
Dec 18 17:00:23.915 INFO [stderr]   |
Dec 18 17:00:23.915 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 18 17:00:23.915 INFO [stderr] 
Dec 18 17:00:23.915 INFO [stderr] warning: variant is never constructed: `Link`
Dec 18 17:00:23.915 INFO [stderr]  --> src/lib.rs:8:5
Dec 18 17:00:23.915 INFO [stderr]   |
Dec 18 17:00:23.915 INFO [stderr] 8 |     Link(Box<SetItem<ValueType>>)
Dec 18 17:00:23.915 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 17:00:23.915 INFO [stderr] 
Dec 18 17:00:23.925 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 17:00:23.925 INFO [stderr]    --> src/lib.rs:106:5
Dec 18 17:00:23.925 INFO [stderr]     |
Dec 18 17:00:23.925 INFO [stderr] 106 |     ds.union(1, 2);
Dec 18 17:00:23.926 INFO [stderr]     |     ^^^^^^^^^^^^^^^
Dec 18 17:00:23.926 INFO [stderr]     |
Dec 18 17:00:23.926 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 18 17:00:23.926 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 17:00:23.926 INFO [stderr] 
Dec 18 17:00:23.927 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 17:00:23.927 INFO [stderr]    --> src/lib.rs:107:5
Dec 18 17:00:23.927 INFO [stderr]     |
Dec 18 17:00:23.927 INFO [stderr] 107 |     ds.union(2, 3);
Dec 18 17:00:23.927 INFO [stderr]     |     ^^^^^^^^^^^^^^^
Dec 18 17:00:23.927 INFO [stderr]     |
Dec 18 17:00:23.928 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 17:00:23.928 INFO [stderr] 
Dec 18 17:00:23.928 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 17:00:23.928 INFO [stderr]    --> src/lib.rs:118:5
Dec 18 17:00:23.928 INFO [stderr]     |
Dec 18 17:00:23.928 INFO [stderr] 118 |     ds.union(-1, 4);
Dec 18 17:00:23.928 INFO [stderr]     |     ^^^^^^^^^^^^^^^^
Dec 18 17:00:23.928 INFO [stderr]     |
Dec 18 17:00:23.928 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 17:00:23.928 INFO [stderr] 
Dec 18 17:00:23.928 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 17:00:23.928 INFO [stderr]    --> src/lib.rs:119:5
Dec 18 17:00:23.928 INFO [stderr]     |
Dec 18 17:00:23.928 INFO [stderr] 119 |     ds.union(2, 4);
Dec 18 17:00:23.928 INFO [stderr]     |     ^^^^^^^^^^^^^^^
Dec 18 17:00:23.928 INFO [stderr]     |
Dec 18 17:00:23.928 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 17:00:23.928 INFO [stderr] 
Dec 18 17:00:23.955 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.42s
Dec 18 17:00:24.346 INFO running `"docker" "inspect" "6b0dd5043fd924160b1f4bb95c1cc39307d0e250bd1b4888ea15d564aa86f62d"`
Dec 18 17:00:24.606 INFO running `"docker" "rm" "-f" "6b0dd5043fd924160b1f4bb95c1cc39307d0e250bd1b4888ea15d564aa86f62d"`
Dec 18 17:00:24.804 INFO [stdout] 6b0dd5043fd924160b1f4bb95c1cc39307d0e250bd1b4888ea15d564aa86f62d