[INFO] updating cached repository https://github.com/conundrumer/crossword
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] cec0ee1cc7277c14c4afeb48fc9488b7fa941ab3
[INFO] checking conundrumer/crossword against try#e689e5eaefe96e6dc3ed5bb629c521b7d207aff7 for pr-64398
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fconundrumer%2Fcrossword" "work/builds/worker-7/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/conundrumer/crossword on toolchain e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/conundrumer/crossword
[INFO] finished tweaking git repo https://github.com/conundrumer/crossword
[INFO] tweaked toml for git repo https://github.com/conundrumer/crossword written to work/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/conundrumer/crossword already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 9ea36f1e0aaaf26b665c85b8c9f9364cebe579c8b9bf3ab0089addf2199006f8
[INFO] running `"docker" "start" "-a" "9ea36f1e0aaaf26b665c85b8c9f9364cebe579c8b9bf3ab0089addf2199006f8"`
[INFO] [stderr]     Checking crossword v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]   --> src/grid.rs:25:21
[INFO] [stderr]    |
[INFO] [stderr] 25 |         vec![Empty; ((bb.width() as usize) * (bb.height() as usize))]
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generate.rs:41:38
[INFO] [stderr]    |
[INFO] [stderr] 41 |     pub fn iter<'b>(&'b self) -> Box<Iterator<Item=Crossword> + 'b> {
[INFO] [stderr]    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Crossword> + 'b`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generate.rs:46:62
[INFO] [stderr]    |
[INFO] [stderr] 46 |     pub fn multi_iter<'b>(&'b self, num_iters: usize) -> Box<Iterator<Item=Crossword> + 'b> {
[INFO] [stderr]    |                                                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Crossword> + 'b`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generate.rs:78:112
[INFO] [stderr]    |
[INFO] [stderr] 78 |     fn from_word_vec_partial<'b>(&'b self, crossword: Crossword, candidates: Rc<Vec<usize>>, seed: u64) -> Box<Iterator<Item=(Crossword, Rc<Vec<usize>>)> + 'b> {
[INFO] [stderr]    |                                                                                                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=(Crossword, Rc<Vec<usize>>)> + 'b`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generate.rs:89:114
[INFO] [stderr]    |
[INFO] [stderr] 89 |     fn from_word_vec_recursive<'b>(&'b self, crossword: Crossword, candidates: Rc<Vec<usize>>, seed: u64) -> Box<Iterator<Item=Crossword> + 'b> {
[INFO] [stderr]    |                                                                                                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Crossword> + 'b`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/generate.rs:100:104
[INFO] [stderr]     |
[INFO] [stderr] 100 |     fn from_word_vec<'b>(&'b self, crossword: Crossword, candidates: Rc<Vec<usize>>, seed: u64) -> Box<Iterator<Item=(Crossword, Rc<Vec<usize>>)> + 'b> {
[INFO] [stderr]     |                                                                                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=(Crossword, Rc<Vec<usize>>)> + 'b`
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]   --> src/grid.rs:25:21
[INFO] [stderr]    |
[INFO] [stderr] 25 |         vec![Empty; ((bb.width() as usize) * (bb.height() as usize))]
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generate.rs:41:38
[INFO] [stderr]    |
[INFO] [stderr] 41 |     pub fn iter<'b>(&'b self) -> Box<Iterator<Item=Crossword> + 'b> {
[INFO] [stderr]    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Crossword> + 'b`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generate.rs:46:62
[INFO] [stderr]    |
[INFO] [stderr] 46 |     pub fn multi_iter<'b>(&'b self, num_iters: usize) -> Box<Iterator<Item=Crossword> + 'b> {
[INFO] [stderr]    |                                                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Crossword> + 'b`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generate.rs:78:112
[INFO] [stderr]    |
[INFO] [stderr] 78 |     fn from_word_vec_partial<'b>(&'b self, crossword: Crossword, candidates: Rc<Vec<usize>>, seed: u64) -> Box<Iterator<Item=(Crossword, Rc<Vec<usize>>)> + 'b> {
[INFO] [stderr]    |                                                                                                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=(Crossword, Rc<Vec<usize>>)> + 'b`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/generate.rs:89:114
[INFO] [stderr]    |
[INFO] [stderr] 89 |     fn from_word_vec_recursive<'b>(&'b self, crossword: Crossword, candidates: Rc<Vec<usize>>, seed: u64) -> Box<Iterator<Item=Crossword> + 'b> {
[INFO] [stderr]    |                                                                                                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=Crossword> + 'b`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/generate.rs:100:104
[INFO] [stderr]     |
[INFO] [stderr] 100 |     fn from_word_vec<'b>(&'b self, crossword: Crossword, candidates: Rc<Vec<usize>>, seed: u64) -> Box<Iterator<Item=(Crossword, Rc<Vec<usize>>)> + 'b> {
[INFO] [stderr]     |                                                                                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=(Crossword, Rc<Vec<usize>>)> + 'b`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/generate.rs:187:73
[INFO] [stderr]     |
[INFO] [stderr] 187 |     pub fn test_generator(words: Vec<&str>, num_areas: usize, test_fn: &Fn(Generator) -> ()) {
[INFO] [stderr]     |                                                                         ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(Generator) -> ()`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/filter.rs:115:17
[INFO] [stderr]     |
[INFO] [stderr] 115 |             let mut seen = &mut self.seen.borrow_mut();
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_valid`
[INFO] [stderr]   --> src/crossword.rs:38:5
[INFO] [stderr]    |
[INFO] [stderr] 38 |     pub fn is_valid(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `iter`
[INFO] [stderr]   --> src/generate.rs:41:5
[INFO] [stderr]    |
[INFO] [stderr] 41 |     pub fn iter<'b>(&'b self) -> Box<Iterator<Item=Crossword> + 'b> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `conservative_impl_trait` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(conservative_impl_trait)]
[INFO] [stderr]   |            ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(stable_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/filter.rs:115:17
[INFO] [stderr]     |
[INFO] [stderr] 115 |             let mut seen = &mut self.seen.borrow_mut();
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `WordPosition`
[INFO] [stderr]    --> src/generate.rs:185:5
[INFO] [stderr]     |
[INFO] [stderr] 185 |     type WordPosition = (&'static str, Position);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `conservative_impl_trait` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(conservative_impl_trait)]
[INFO] [stderr]   |            ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(stable_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.10s
[INFO] running `"docker" "inspect" "9ea36f1e0aaaf26b665c85b8c9f9364cebe579c8b9bf3ab0089addf2199006f8"`
[INFO] running `"docker" "rm" "-f" "9ea36f1e0aaaf26b665c85b8c9f9364cebe579c8b9bf3ab0089addf2199006f8"`
[INFO] [stdout] 9ea36f1e0aaaf26b665c85b8c9f9364cebe579c8b9bf3ab0089addf2199006f8