[INFO] updating cached repository https://github.com/swizzard/boggler
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/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] cc01442ec61024df5448d8460f06d2fcdd7e2531
[INFO] testing swizzard/boggler against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fswizzard%2Fboggler" "/workspace/builds/worker-4/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/swizzard/boggler on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/swizzard/boggler
[INFO] finished tweaking git repo https://github.com/swizzard/boggler
[INFO] tweaked toml for git repo https://github.com/swizzard/boggler written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/swizzard/boggler already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] ab2a527f710c766791e022f27d983e9a32922b30857da99b56fec57bd52b5050
[INFO] running `"docker" "start" "-a" "ab2a527f710c766791e022f27d983e9a32922b30857da99b56fec57bd52b5050"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling ascii v0.8.7
[INFO] [stderr]    Compiling atty v0.2.10
[INFO] [stderr]    Compiling textwrap v0.9.0
[INFO] [stderr]    Compiling rand v0.5.1
[INFO] [stderr]    Compiling clap v2.31.2
[INFO] [stderr]    Compiling boggler v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning[E0170]: pattern binding `q` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]   --> src/solver.rs:98:13
[INFO] [stderr]    |
[INFO] [stderr] 98 |         let q = &AsciiChar::from('q').unwrap();
[INFO] [stderr]    |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::q`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bindings_with_variant_name)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `u` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]   --> src/solver.rs:99:13
[INFO] [stderr]    |
[INFO] [stderr] 99 |         let u = &AsciiChar::from('u').unwrap();
[INFO] [stderr]    |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::u`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:102:13
[INFO] [stderr]     |
[INFO] [stderr] 102 |         for c in word.chars() {
[INFO] [stderr]     |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:143:26
[INFO] [stderr]     |
[INFO] [stderr] 143 |                     Some(c) => self.children.get(c).and_then(|ref child| child.find(&mut chrs, &ascii_word)),
[INFO] [stderr]     |                          ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:181:18
[INFO] [stderr]     |
[INFO] [stderr] 181 |             Some(c) => self.children.entry(*c).or_insert(BTNode::new()).insert(chrs, word),
[INFO] [stderr]     |                  ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:199:18
[INFO] [stderr]     |
[INFO] [stderr] 199 |             Some(c) => self.children.get(c).and_then(|child| child.find(chrs, word))
[INFO] [stderr]     |                  ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `seen`
[INFO] [stderr]    --> src/solver.rs:156:13
[INFO] [stderr]     |
[INFO] [stderr] 156 |         let mut seen: HashSet<BoardPosition> = HashSet::with_capacity(16);
[INFO] [stderr]     |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_seen`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `adjcts`
[INFO] [stderr]    --> src/solver.rs:158:17
[INFO] [stderr]     |
[INFO] [stderr] 158 |             let adjcts = board.adjacents(x, y);
[INFO] [stderr]     |                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_adjcts`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/solver.rs:154:13
[INFO] [stderr]     |
[INFO] [stderr] 154 |         let mut x = 0;
[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: variable does not need to be mutable
[INFO] [stderr]    --> src/solver.rs:155:13
[INFO] [stderr]     |
[INFO] [stderr] 155 |         let mut y = 0;
[INFO] [stderr]     |             ----^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/solver.rs:156:13
[INFO] [stderr]     |
[INFO] [stderr] 156 |         let mut seen: HashSet<BoardPosition> = HashSet::with_capacity(16);
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `find_letter`
[INFO] [stderr]    --> src/solver.rs:149:5
[INFO] [stderr]     |
[INFO] [stderr] 149 |     fn find_letter(&self, chr: &AsciiChar) -> Option<&BTNode> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 12 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0170`.
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 17.05s
[INFO] running `"docker" "inspect" "ab2a527f710c766791e022f27d983e9a32922b30857da99b56fec57bd52b5050"`
[INFO] running `"docker" "rm" "-f" "ab2a527f710c766791e022f27d983e9a32922b30857da99b56fec57bd52b5050"`
[INFO] [stdout] ab2a527f710c766791e022f27d983e9a32922b30857da99b56fec57bd52b5050
[INFO] running `"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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 1b3a360047852974a4f56f2e9eb4fdeb70ed756204c8220f5e80bd27f2aa684d
[INFO] running `"docker" "start" "-a" "1b3a360047852974a4f56f2e9eb4fdeb70ed756204c8220f5e80bd27f2aa684d"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling boggler v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning[E0170]: pattern binding `q` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]   --> src/solver.rs:98:13
[INFO] [stderr]    |
[INFO] [stderr] 98 |         let q = &AsciiChar::from('q').unwrap();
[INFO] [stderr]    |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::q`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bindings_with_variant_name)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `u` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]   --> src/solver.rs:99:13
[INFO] [stderr]    |
[INFO] [stderr] 99 |         let u = &AsciiChar::from('u').unwrap();
[INFO] [stderr]    |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::u`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:102:13
[INFO] [stderr]     |
[INFO] [stderr] 102 |         for c in word.chars() {
[INFO] [stderr]     |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:143:26
[INFO] [stderr]     |
[INFO] [stderr] 143 |                     Some(c) => self.children.get(c).and_then(|ref child| child.find(&mut chrs, &ascii_word)),
[INFO] [stderr]     |                          ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:181:18
[INFO] [stderr]     |
[INFO] [stderr] 181 |             Some(c) => self.children.entry(*c).or_insert(BTNode::new()).insert(chrs, word),
[INFO] [stderr]     |                  ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:199:18
[INFO] [stderr]     |
[INFO] [stderr] 199 |             Some(c) => self.children.get(c).and_then(|child| child.find(chrs, word))
[INFO] [stderr]     |                  ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `seen`
[INFO] [stderr]    --> src/solver.rs:156:13
[INFO] [stderr]     |
[INFO] [stderr] 156 |         let mut seen: HashSet<BoardPosition> = HashSet::with_capacity(16);
[INFO] [stderr]     |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_seen`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `adjcts`
[INFO] [stderr]    --> src/solver.rs:158:17
[INFO] [stderr]     |
[INFO] [stderr] 158 |             let adjcts = board.adjacents(x, y);
[INFO] [stderr]     |                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_adjcts`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/solver.rs:154:13
[INFO] [stderr]     |
[INFO] [stderr] 154 |         let mut x = 0;
[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: variable does not need to be mutable
[INFO] [stderr]    --> src/solver.rs:155:13
[INFO] [stderr]     |
[INFO] [stderr] 155 |         let mut y = 0;
[INFO] [stderr]     |             ----^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/solver.rs:156:13
[INFO] [stderr]     |
[INFO] [stderr] 156 |         let mut seen: HashSet<BoardPosition> = HashSet::with_capacity(16);
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `find_letter`
[INFO] [stderr]    --> src/solver.rs:149:5
[INFO] [stderr]     |
[INFO] [stderr] 149 |     fn find_letter(&self, chr: &AsciiChar) -> Option<&BTNode> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 12 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0170`.
[INFO] [stderr] warning[E0170]: pattern binding `q` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]   --> src/solver.rs:98:13
[INFO] [stderr]    |
[INFO] [stderr] 98 |         let q = &AsciiChar::from('q').unwrap();
[INFO] [stderr]    |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::q`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bindings_with_variant_name)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `u` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]   --> src/solver.rs:99:13
[INFO] [stderr]    |
[INFO] [stderr] 99 |         let u = &AsciiChar::from('u').unwrap();
[INFO] [stderr]    |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::u`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:102:13
[INFO] [stderr]     |
[INFO] [stderr] 102 |         for c in word.chars() {
[INFO] [stderr]     |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:143:26
[INFO] [stderr]     |
[INFO] [stderr] 143 |                     Some(c) => self.children.get(c).and_then(|ref child| child.find(&mut chrs, &ascii_word)),
[INFO] [stderr]     |                          ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:181:18
[INFO] [stderr]     |
[INFO] [stderr] 181 |             Some(c) => self.children.entry(*c).or_insert(BTNode::new()).insert(chrs, word),
[INFO] [stderr]     |                  ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:199:18
[INFO] [stderr]     |
[INFO] [stderr] 199 |             Some(c) => self.children.get(c).and_then(|child| child.find(chrs, word))
[INFO] [stderr]     |                  ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `h` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:220:13
[INFO] [stderr]     |
[INFO] [stderr] 220 |         let h = AsciiChar::from('h').unwrap();
[INFO] [stderr]     |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::h`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `e` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:221:13
[INFO] [stderr]     |
[INFO] [stderr] 221 |         let e = AsciiChar::from('e').unwrap();
[INFO] [stderr]     |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::e`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `r` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:222:13
[INFO] [stderr]     |
[INFO] [stderr] 222 |         let r = AsciiChar::from('r').unwrap();
[INFO] [stderr]     |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::r`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `h` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:231:13
[INFO] [stderr]     |
[INFO] [stderr] 231 |         let h = AsciiChar::from('h').unwrap();
[INFO] [stderr]     |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::h`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `e` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:232:13
[INFO] [stderr]     |
[INFO] [stderr] 232 |         let e = AsciiChar::from('e').unwrap();
[INFO] [stderr]     |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::e`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `r` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:233:13
[INFO] [stderr]     |
[INFO] [stderr] 233 |         let r = AsciiChar::from('r').unwrap();
[INFO] [stderr]     |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::r`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `o` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:234:13
[INFO] [stderr]     |
[INFO] [stderr] 234 |         let o = AsciiChar::from('o').unwrap();
[INFO] [stderr]     |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::o`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `seen`
[INFO] [stderr]    --> src/solver.rs:156:13
[INFO] [stderr]     |
[INFO] [stderr] 156 |         let mut seen: HashSet<BoardPosition> = HashSet::with_capacity(16);
[INFO] [stderr]     |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_seen`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `adjcts`
[INFO] [stderr]    --> src/solver.rs:158:17
[INFO] [stderr]     |
[INFO] [stderr] 158 |             let adjcts = board.adjacents(x, y);
[INFO] [stderr]     |                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_adjcts`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/solver.rs:154:13
[INFO] [stderr]     |
[INFO] [stderr] 154 |         let mut x = 0;
[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: variable does not need to be mutable
[INFO] [stderr]    --> src/solver.rs:155:13
[INFO] [stderr]     |
[INFO] [stderr] 155 |         let mut y = 0;
[INFO] [stderr]     |             ----^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/solver.rs:156:13
[INFO] [stderr]     |
[INFO] [stderr] 156 |         let mut seen: HashSet<BoardPosition> = HashSet::with_capacity(16);
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: 18 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0170`.
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.52s
[INFO] running `"docker" "inspect" "1b3a360047852974a4f56f2e9eb4fdeb70ed756204c8220f5e80bd27f2aa684d"`
[INFO] running `"docker" "rm" "-f" "1b3a360047852974a4f56f2e9eb4fdeb70ed756204c8220f5e80bd27f2aa684d"`
[INFO] [stdout] 1b3a360047852974a4f56f2e9eb4fdeb70ed756204c8220f5e80bd27f2aa684d
[INFO] running `"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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 0f8afe852f080f3e52cd17b44f7b7e800bd7931b66cd2fcbe22f8ff9f87eb159
[INFO] running `"docker" "start" "-a" "0f8afe852f080f3e52cd17b44f7b7e800bd7931b66cd2fcbe22f8ff9f87eb159"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning[E0170]: pattern binding `q` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]   --> src/solver.rs:98:13
[INFO] [stderr]    |
[INFO] [stderr] 98 |         let q = &AsciiChar::from('q').unwrap();
[INFO] [stderr]    |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::q`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bindings_with_variant_name)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `u` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]   --> src/solver.rs:99:13
[INFO] [stderr]    |
[INFO] [stderr] 99 |         let u = &AsciiChar::from('u').unwrap();
[INFO] [stderr]    |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::u`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:102:13
[INFO] [stderr]     |
[INFO] [stderr] 102 |         for c in word.chars() {
[INFO] [stderr]     |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:143:26
[INFO] [stderr]     |
[INFO] [stderr] 143 |                     Some(c) => self.children.get(c).and_then(|ref child| child.find(&mut chrs, &ascii_word)),
[INFO] [stderr]     |                          ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:181:18
[INFO] [stderr]     |
[INFO] [stderr] 181 |             Some(c) => self.children.entry(*c).or_insert(BTNode::new()).insert(chrs, word),
[INFO] [stderr]     |                  ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:199:18
[INFO] [stderr]     |
[INFO] [stderr] 199 |             Some(c) => self.children.get(c).and_then(|child| child.find(chrs, word))
[INFO] [stderr]     |                  ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `h` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:220:13
[INFO] [stderr]     |
[INFO] [stderr] 220 |         let h = AsciiChar::from('h').unwrap();
[INFO] [stderr]     |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::h`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `e` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:221:13
[INFO] [stderr]     |
[INFO] [stderr] 221 |         let e = AsciiChar::from('e').unwrap();
[INFO] [stderr]     |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::e`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `r` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:222:13
[INFO] [stderr]     |
[INFO] [stderr] 222 |         let r = AsciiChar::from('r').unwrap();
[INFO] [stderr]     |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::r`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `h` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:231:13
[INFO] [stderr]     |
[INFO] [stderr] 231 |         let h = AsciiChar::from('h').unwrap();
[INFO] [stderr]     |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::h`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `e` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:232:13
[INFO] [stderr]     |
[INFO] [stderr] 232 |         let e = AsciiChar::from('e').unwrap();
[INFO] [stderr]     |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::e`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `r` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:233:13
[INFO] [stderr]     |
[INFO] [stderr] 233 |         let r = AsciiChar::from('r').unwrap();
[INFO] [stderr]     |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::r`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `o` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:234:13
[INFO] [stderr]     |
[INFO] [stderr] 234 |         let o = AsciiChar::from('o').unwrap();
[INFO] [stderr]     |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::o`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `seen`
[INFO] [stderr]    --> src/solver.rs:156:13
[INFO] [stderr]     |
[INFO] [stderr] 156 |         let mut seen: HashSet<BoardPosition> = HashSet::with_capacity(16);
[INFO] [stderr]     |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_seen`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `adjcts`
[INFO] [stderr]    --> src/solver.rs:158:17
[INFO] [stderr]     |
[INFO] [stderr] 158 |             let adjcts = board.adjacents(x, y);
[INFO] [stderr]     |                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_adjcts`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/solver.rs:154:13
[INFO] [stderr]     |
[INFO] [stderr] 154 |         let mut x = 0;
[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: variable does not need to be mutable
[INFO] [stderr]    --> src/solver.rs:155:13
[INFO] [stderr]     |
[INFO] [stderr] 155 |         let mut y = 0;
[INFO] [stderr]     |             ----^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/solver.rs:156:13
[INFO] [stderr]     |
[INFO] [stderr] 156 |         let mut seen: HashSet<BoardPosition> = HashSet::with_capacity(16);
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: 18 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0170`.
[INFO] [stderr] warning[E0170]: pattern binding `q` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]   --> src/solver.rs:98:13
[INFO] [stderr]    |
[INFO] [stderr] 98 |         let q = &AsciiChar::from('q').unwrap();
[INFO] [stderr]    |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::q`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bindings_with_variant_name)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `u` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]   --> src/solver.rs:99:13
[INFO] [stderr]    |
[INFO] [stderr] 99 |         let u = &AsciiChar::from('u').unwrap();
[INFO] [stderr]    |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::u`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:102:13
[INFO] [stderr]     |
[INFO] [stderr] 102 |         for c in word.chars() {
[INFO] [stderr]     |             ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:143:26
[INFO] [stderr]     |
[INFO] [stderr] 143 |                     Some(c) => self.children.get(c).and_then(|ref child| child.find(&mut chrs, &ascii_word)),
[INFO] [stderr]     |                          ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:181:18
[INFO] [stderr]     |
[INFO] [stderr] 181 |             Some(c) => self.children.entry(*c).or_insert(BTNode::new()).insert(chrs, word),
[INFO] [stderr]     |                  ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `c` is named the same as one of the variants of the type `solver::ascii::AsciiChar`
[INFO] [stderr]    --> src/solver.rs:199:18
[INFO] [stderr]     |
[INFO] [stderr] 199 |             Some(c) => self.children.get(c).and_then(|child| child.find(chrs, word))
[INFO] [stderr]     |                  ^ help: to match on the variant, qualify the path: `solver::ascii::AsciiChar::c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `seen`
[INFO] [stderr]    --> src/solver.rs:156:13
[INFO] [stderr]     |
[INFO] [stderr] 156 |         let mut seen: HashSet<BoardPosition> = HashSet::with_capacity(16);
[INFO] [stderr]     |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_seen`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `adjcts`
[INFO] [stderr]    --> src/solver.rs:158:17
[INFO] [stderr]     |
[INFO] [stderr] 158 |             let adjcts = board.adjacents(x, y);
[INFO] [stderr]     |                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_adjcts`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/solver.rs:154:13
[INFO] [stderr]     |
[INFO] [stderr] 154 |         let mut x = 0;
[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: variable does not need to be mutable
[INFO] [stderr]    --> src/solver.rs:155:13
[INFO] [stderr]     |
[INFO] [stderr] 155 |         let mut y = 0;
[INFO] [stderr]     |             ----^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/solver.rs:156:13
[INFO] [stderr]     |
[INFO] [stderr] 156 |         let mut seen: HashSet<BoardPosition> = HashSet::with_capacity(16);
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `find_letter`
[INFO] [stderr]    --> src/solver.rs:149:5
[INFO] [stderr]     |
[INFO] [stderr] 149 |     fn find_letter(&self, chr: &AsciiChar) -> Option<&BTNode> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 12 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0170`.
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/boggler-4a9707a19bb0483f
[INFO] [stdout] running 16 tests
[INFO] [stdout] test board::test::test_adjacents_bottom ... ok
[INFO] [stdout] test solver::test::new_one_word ... ok
[INFO] [stdout] test solver::test::prepare_word_lowercase ... ok
[INFO] [stdout] test solver::test::new_empty ... ok
[INFO] [stdout] test solver::test::two_new_words ... ok
[INFO] [stdout] test solver::test::find_letter ... ok
[INFO] [stdout] test solver::test::find ... ok
[INFO] [stdout] test board::test::test_adjacents_top ... ok
[INFO] [stdout] test board::test::test_adjacents_right_side ... ok
[INFO] [stdout] test board::test::test_adjacents_middle ... ok
[INFO] [stdout] test board::test::test_adjacents_upper_right_corner ... ok
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/boggler-1bd0f1dba98b9f78
[INFO] [stdout] test board::test::test_adjacents_left_side ... ok
[INFO] [stdout] test solver::test::count_word_no_q ... ok
[INFO] [stdout] test board::test::test_adjacents_upper_left_corner ... ok
[INFO] [stdout] test solver::test::count_word_q ... ok
[INFO] [stdout] test solver::test::count_word_u_no_q ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests boggler
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "0f8afe852f080f3e52cd17b44f7b7e800bd7931b66cd2fcbe22f8ff9f87eb159"`
[INFO] running `"docker" "rm" "-f" "0f8afe852f080f3e52cd17b44f7b7e800bd7931b66cd2fcbe22f8ff9f87eb159"`
[INFO] [stdout] 0f8afe852f080f3e52cd17b44f7b7e800bd7931b66cd2fcbe22f8ff9f87eb159