[INFO] cloning repository https://github.com/mvojacek/rust-expr-calc
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mvojacek/rust-expr-calc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmvojacek%2Frust-expr-calc", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmvojacek%2Frust-expr-calc'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fe285145034d08d383d362c3f5f6c61aa72daf6c
[INFO] checking mvojacek/rust-expr-calc against try#8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8 for pr-82565
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmvojacek%2Frust-expr-calc" "/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/mvojacek/rust-expr-calc on toolchain 8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mvojacek/rust-expr-calc
[INFO] finished tweaking git repo https://github.com/mvojacek/rust-expr-calc
[INFO] tweaked toml for git repo https://github.com/mvojacek/rust-expr-calc written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/mvojacek/rust-expr-calc already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded num-bigint v0.2.2
[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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e3a40f387514ce119e76673cd5739a83b1799e2e5eb5a8024ea058423f62eac1
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "e3a40f387514ce119e76673cd5739a83b1799e2e5eb5a8024ea058423f62eac1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e3a40f387514ce119e76673cd5739a83b1799e2e5eb5a8024ea058423f62eac1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e3a40f387514ce119e76673cd5739a83b1799e2e5eb5a8024ea058423f62eac1", kill_on_drop: false }`
[INFO] [stdout] e3a40f387514ce119e76673cd5739a83b1799e2e5eb5a8024ea058423f62eac1
[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=forbid" "-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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1bb3fa09335d62c6691d7e9612c1d09ad3cab0b8b48527e1952fda335cb96c22
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "1bb3fa09335d62c6691d7e9612c1d09ad3cab0b8b48527e1952fda335cb96c22", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-iter v0.1.39
[INFO] [stderr]     Checking itertools v0.8.0
[INFO] [stderr]     Checking num-complex v0.2.1
[INFO] [stderr]     Checking num-bigint v0.2.2
[INFO] [stderr]     Checking num-rational v0.2.1
[INFO] [stderr]     Checking num v0.2.0
[INFO] [stderr]     Checking rustplay v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/asdebug.rs:6:28
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn as_debug(&self) -> &Debug;
[INFO] [stdout]   |                            ^^^^^ help: use `dyn`: `dyn Debug`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/asdebug.rs:16:28
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn as_debug(&self) -> &Debug {
[INFO] [stdout]    |                            ^^^^^ help: use `dyn`: `dyn Debug`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/nodelinkedlist.rs:327:48
[INFO] [stdout]     |
[INFO] [stdout] 327 |         let it = &mut iter.into_iter() as &mut Iterator<Item=A>;
[INFO] [stdout]     |                                                ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=A>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:99:15
[INFO] [stdout]    |
[INFO] [stdout] 99 |     OpErr(Box<fmt::Display + Send>),
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn fmt::Display + Send`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:210:40
[INFO] [stdout]     |
[INFO] [stdout] 210 |     where F: Fn(N, N) -> Result<N, Box<fmt::Display + Send>> {
[INFO] [stdout]     |                                        ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn fmt::Display + Send`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stdout]    --> src/nodelinkedlist.rs:347:37
[INFO] [stdout]     |
[INFO] [stdout] 347 |         let mut n: [Node<i32>; 4] = mem::uninitialized();
[INFO] [stdout]     |                                     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/asdebug.rs:6:28
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn as_debug(&self) -> &Debug;
[INFO] [stdout]   |                            ^^^^^ help: use `dyn`: `dyn Debug`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/asdebug.rs:16:28
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn as_debug(&self) -> &Debug {
[INFO] [stdout]    |                            ^^^^^ help: use `dyn`: `dyn Debug`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/nodelinkedlist.rs:327:48
[INFO] [stdout]     |
[INFO] [stdout] 327 |         let it = &mut iter.into_iter() as &mut Iterator<Item=A>;
[INFO] [stdout]     |                                                ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=A>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:99:15
[INFO] [stdout]    |
[INFO] [stdout] 99 |     OpErr(Box<fmt::Display + Send>),
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn fmt::Display + Send`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:210:40
[INFO] [stdout]     |
[INFO] [stdout] 210 |     where F: Fn(N, N) -> Result<N, Box<fmt::Display + Send>> {
[INFO] [stdout]     |                                        ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn fmt::Display + Send`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stdout]    --> src/nodelinkedlist.rs:347:37
[INFO] [stdout]     |
[INFO] [stdout] 347 |         let mut n: [Node<i32>; 4] = mem::uninitialized();
[INFO] [stdout]     |                                     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `locked`
[INFO] [stdout]    --> src/main.rs:184:24
[INFO] [stdout]     |
[INFO] [stdout] 184 |         Expr::Num { n, locked } => Ok(n),
[INFO] [stdout]     |                        ^^^^^^ help: try ignoring the field: `locked: _`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `locked`
[INFO] [stdout]    --> src/main.rs:184:24
[INFO] [stdout]     |
[INFO] [stdout] 184 |         Expr::Num { n, locked } => Ok(n),
[INFO] [stdout]     |                        ^^^^^^ help: try ignoring the field: `locked: _`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/main.rs:225:37
[INFO] [stdout]     |
[INFO] [stdout] 225 |                         Expr::Num { n, locked } => {
[INFO] [stdout]     |                                     ^ help: try ignoring the field: `n: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/main.rs:233:29
[INFO] [stdout]     |
[INFO] [stdout] 233 |                 Expr::Num { n, locked: true } => return Ok(()),
[INFO] [stdout]     |                             ^ help: try ignoring the field: `n: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/main.rs:241:37
[INFO] [stdout]     |
[INFO] [stdout] 241 |                         Expr::Num { n, locked } => {
[INFO] [stdout]     |                                     ^ help: try ignoring the field: `n: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/main.rs:249:29
[INFO] [stdout]     |
[INFO] [stdout] 249 |                 Expr::Num { n, locked: true } => return Ok(()),
[INFO] [stdout]     |                             ^ help: try ignoring the field: `n: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]    --> src/main.rs:276:44
[INFO] [stdout]     |
[INFO] [stdout] 276 |             paren_mut_adjacent_num(&n, p, |num, locked| {
[INFO] [stdout]     |                                            ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/main.rs:302:65
[INFO] [stdout]     |
[INFO] [stdout] 302 |             paren_mut_adjacent_num(&close_paren, Paren::Close, |n, locked| {
[INFO] [stdout]     |                                                                 ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/main.rs:305:63
[INFO] [stdout]     |
[INFO] [stdout] 305 |             paren_mut_adjacent_num(&open_paren, Paren::Open, |n, locked| {
[INFO] [stdout]     |                                                               ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `locked`
[INFO] [stdout]    --> src/main.rs:292:32
[INFO] [stdout]     |
[INFO] [stdout] 292 |                 Expr::Num { n, locked } => n,
[INFO] [stdout]     |                                ^^^^^^ help: try ignoring the field: `locked: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/main.rs:385:25
[INFO] [stdout]     |
[INFO] [stdout] 385 |             Expr::Num { n, locked } => true,
[INFO] [stdout]     |                         ^ help: try ignoring the field: `n: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `locked`
[INFO] [stdout]    --> src/main.rs:385:28
[INFO] [stdout]     |
[INFO] [stdout] 385 |             Expr::Num { n, locked } => true,
[INFO] [stdout]     |                            ^^^^^^ help: try ignoring the field: `locked: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n4`
[INFO] [stdout]    --> src/nodelinkedlist.rs:443:9
[INFO] [stdout]     |
[INFO] [stdout] 443 |     let n4 = Node::new(4);
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_n4`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/main.rs:225:37
[INFO] [stdout]     |
[INFO] [stdout] 225 |                         Expr::Num { n, locked } => {
[INFO] [stdout]     |                                     ^ help: try ignoring the field: `n: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/main.rs:233:29
[INFO] [stdout]     |
[INFO] [stdout] 233 |                 Expr::Num { n, locked: true } => return Ok(()),
[INFO] [stdout]     |                             ^ help: try ignoring the field: `n: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/main.rs:241:37
[INFO] [stdout]     |
[INFO] [stdout] 241 |                         Expr::Num { n, locked } => {
[INFO] [stdout]     |                                     ^ help: try ignoring the field: `n: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/main.rs:249:29
[INFO] [stdout]     |
[INFO] [stdout] 249 |                 Expr::Num { n, locked: true } => return Ok(()),
[INFO] [stdout]     |                             ^ help: try ignoring the field: `n: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]    --> src/main.rs:276:44
[INFO] [stdout]     |
[INFO] [stdout] 276 |             paren_mut_adjacent_num(&n, p, |num, locked| {
[INFO] [stdout]     |                                            ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/main.rs:302:65
[INFO] [stdout]     |
[INFO] [stdout] 302 |             paren_mut_adjacent_num(&close_paren, Paren::Close, |n, locked| {
[INFO] [stdout]     |                                                                 ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/main.rs:305:63
[INFO] [stdout]     |
[INFO] [stdout] 305 |             paren_mut_adjacent_num(&open_paren, Paren::Open, |n, locked| {
[INFO] [stdout]     |                                                               ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `locked`
[INFO] [stdout]    --> src/main.rs:292:32
[INFO] [stdout]     |
[INFO] [stdout] 292 |                 Expr::Num { n, locked } => n,
[INFO] [stdout]     |                                ^^^^^^ help: try ignoring the field: `locked: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/main.rs:385:25
[INFO] [stdout]     |
[INFO] [stdout] 385 |             Expr::Num { n, locked } => true,
[INFO] [stdout]     |                         ^ help: try ignoring the field: `n: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `locked`
[INFO] [stdout]    --> src/main.rs:385:28
[INFO] [stdout]     |
[INFO] [stdout] 385 |             Expr::Num { n, locked } => true,
[INFO] [stdout]     |                            ^^^^^^ help: try ignoring the field: `locked: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert_before_node`
[INFO] [stdout]    --> src/nodelinkedlist.rs:133:12
[INFO] [stdout]     |
[INFO] [stdout] 133 |     pub fn insert_before_node(self, node: &Self) {
[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: `insert_before`
[INFO] [stdout]    --> src/nodelinkedlist.rs:146:12
[INFO] [stdout]     |
[INFO] [stdout] 146 |     pub fn insert_before(&self, val: T) -> Self {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `split_after`
[INFO] [stdout]    --> src/nodelinkedlist.rs:166:12
[INFO] [stdout]     |
[INFO] [stdout] 166 |     pub fn split_after(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `split_before`
[INFO] [stdout]    --> src/nodelinkedlist.rs:173:12
[INFO] [stdout]     |
[INFO] [stdout] 173 |     pub fn split_before(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter_walk_val`
[INFO] [stdout]    --> src/nodelinkedlist.rs:209:12
[INFO] [stdout]     |
[INFO] [stdout] 209 |     pub fn iter_walk_val(&self) -> WalkingIterVal<T> where T: Clone {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `list_iter_back`
[INFO] [stdout]    --> src/nodelinkedlist.rs:217:12
[INFO] [stdout]     |
[INFO] [stdout] 217 |     pub fn list_iter_back(&self) -> Chain<Once<Self>, WalkingIterBack<T>> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `list_iter_val`
[INFO] [stdout]    --> src/nodelinkedlist.rs:221:12
[INFO] [stdout]     |
[INFO] [stdout] 221 |     pub fn list_iter_val(&self) -> Chain<Once<T>, WalkingIterVal<T>> where T: Clone {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]    --> src/nodelinkedlist.rs:227:12
[INFO] [stdout]     |
[INFO] [stdout] 227 |     pub fn tail(&self) -> Self {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `head`
[INFO] [stdout]    --> src/nodelinkedlist.rs:231:12
[INFO] [stdout]     |
[INFO] [stdout] 231 |     pub fn head(&self) -> Self {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `list_distance`
[INFO] [stdout]    --> src/nodelinkedlist.rs:239:12
[INFO] [stdout]     |
[INFO] [stdout] 239 |     pub fn list_distance(&self, following: &Self) -> Option<usize> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `list_find`
[INFO] [stdout]    --> src/nodelinkedlist.rs:244:12
[INFO] [stdout]     |
[INFO] [stdout] 244 |     pub fn list_find(&self, other: &Self) -> Option<(bool, usize)> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `list_append_node`
[INFO] [stdout]    --> src/nodelinkedlist.rs:252:12
[INFO] [stdout]     |
[INFO] [stdout] 252 |     pub fn list_append_node(&self, node: &Self) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `list_append`
[INFO] [stdout]    --> src/nodelinkedlist.rs:256:12
[INFO] [stdout]     |
[INFO] [stdout] 256 |     pub fn list_append(&self, val: T) -> Self {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `list_prepend_node`
[INFO] [stdout]    --> src/nodelinkedlist.rs:260:12
[INFO] [stdout]     |
[INFO] [stdout] 260 |     pub fn list_prepend_node(&self, node: &Self) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `list_prepend`
[INFO] [stdout]    --> src/nodelinkedlist.rs:264:12
[INFO] [stdout]     |
[INFO] [stdout] 264 |     pub fn list_prepend(&self, val: T) -> Self {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `make_linkedlist_for_tests`
[INFO] [stdout]    --> src/nodelinkedlist.rs:345:4
[INFO] [stdout]     |
[INFO] [stdout] 345 | fn make_linkedlist_for_tests() -> [Node<i32>; 4] {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate10`
[INFO] [stdout]    --> src/main.rs:125:4
[INFO] [stdout]     |
[INFO] [stdout] 125 | fn calculate10<N: MyNum>(expr: &String) -> Result<N, (Option<usize>, CalcErr<N>)> {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_num`
[INFO] [stdout]    --> src/main.rs:383:8
[INFO] [stdout]     |
[INFO] [stdout] 383 |     fn is_num(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_op`
[INFO] [stdout]    --> src/main.rs:389:8
[INFO] [stdout]     |
[INFO] [stdout] 389 |     fn is_op(&self) -> bool {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_paren`
[INFO] [stdout]    --> src/main.rs:395:8
[INFO] [stdout]     |
[INFO] [stdout] 395 |     fn is_paren(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]  --> src/asdebug.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(specialization, core_intrinsics)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate-level attribute should be in the root module
[INFO] [stdout]  --> src/asdebug.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(specialization, core_intrinsics)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 39 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert_before`
[INFO] [stdout]    --> src/nodelinkedlist.rs:146:12
[INFO] [stdout]     |
[INFO] [stdout] 146 |     pub fn insert_before(&self, val: T) -> Self {
[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: `split_after`
[INFO] [stdout]    --> src/nodelinkedlist.rs:166:12
[INFO] [stdout]     |
[INFO] [stdout] 166 |     pub fn split_after(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `split_before`
[INFO] [stdout]    --> src/nodelinkedlist.rs:173:12
[INFO] [stdout]     |
[INFO] [stdout] 173 |     pub fn split_before(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `list_append_node`
[INFO] [stdout]    --> src/nodelinkedlist.rs:252:12
[INFO] [stdout]     |
[INFO] [stdout] 252 |     pub fn list_append_node(&self, node: &Self) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `list_append`
[INFO] [stdout]    --> src/nodelinkedlist.rs:256:12
[INFO] [stdout]     |
[INFO] [stdout] 256 |     pub fn list_append(&self, val: T) -> Self {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `list_prepend_node`
[INFO] [stdout]    --> src/nodelinkedlist.rs:260:12
[INFO] [stdout]     |
[INFO] [stdout] 260 |     pub fn list_prepend_node(&self, node: &Self) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `list_prepend`
[INFO] [stdout]    --> src/nodelinkedlist.rs:264:12
[INFO] [stdout]     |
[INFO] [stdout] 264 |     pub fn list_prepend(&self, val: T) -> Self {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_num`
[INFO] [stdout]    --> src/main.rs:383:8
[INFO] [stdout]     |
[INFO] [stdout] 383 |     fn is_num(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_op`
[INFO] [stdout]    --> src/main.rs:389:8
[INFO] [stdout]     |
[INFO] [stdout] 389 |     fn is_op(&self) -> bool {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_paren`
[INFO] [stdout]    --> src/main.rs:395:8
[INFO] [stdout]     |
[INFO] [stdout] 395 |     fn is_paren(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]  --> src/asdebug.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(specialization, core_intrinsics)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate-level attribute should be in the root module
[INFO] [stdout]  --> src/asdebug.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(specialization, core_intrinsics)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 30 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.56s
[INFO] running `Command { std: "docker" "inspect" "1bb3fa09335d62c6691d7e9612c1d09ad3cab0b8b48527e1952fda335cb96c22", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1bb3fa09335d62c6691d7e9612c1d09ad3cab0b8b48527e1952fda335cb96c22", kill_on_drop: false }`
[INFO] [stdout] 1bb3fa09335d62c6691d7e9612c1d09ad3cab0b8b48527e1952fda335cb96c22