[INFO] cloning repository https://github.com/myself659/avltree
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/myself659/avltree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmyself659%2Favltree", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmyself659%2Favltree'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2408a6a6eadad2c48086268f33aba7039affcde8
[INFO] linting myself659/avltree against nightly for clippy-nonminimal_bool-denied
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmyself659%2Favltree" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/myself659/avltree
[INFO] finished tweaking git repo https://github.com/myself659/avltree
[INFO] tweaked toml for git repo https://github.com/myself659/avltree written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/myself659/avltree on toolchain nightly
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/myself659/avltree already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded thread_local v0.3.6
[INFO] [stderr]   Downloaded quickcheck_macros v0.8.0
[INFO] [stderr]   Downloaded quickcheck v0.8.5
[INFO] [stderr]   Downloaded env_logger v0.6.2
[INFO] [stderr]   Downloaded itertools v0.8.0
[INFO] [stderr]   Downloaded aho-corasick v0.7.6
[INFO] [stderr]   Downloaded regex v1.2.1
[INFO] [stderr]   Downloaded regex-syntax v0.6.11
[INFO] [stderr]   Downloaded libc v0.2.61
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ddc3bfc6316ff035aec5f410ab799c2af7e4cf655f0583f5ed02a8d2799552c1
[INFO] running `Command { std: "docker" "start" "-a" "ddc3bfc6316ff035aec5f410ab799c2af7e4cf655f0583f5ed02a8d2799552c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ddc3bfc6316ff035aec5f410ab799c2af7e4cf655f0583f5ed02a8d2799552c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ddc3bfc6316ff035aec5f410ab799c2af7e4cf655f0583f5ed02a8d2799552c1", kill_on_drop: false }`
[INFO] [stdout] ddc3bfc6316ff035aec5f410ab799c2af7e4cf655f0583f5ed02a8d2799552c1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "clippy" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e562da024493aa284f21b6062a0cff29bda278b4268743e8c67d0270c619e0c0
[INFO] running `Command { std: "docker" "start" "-a" "e562da024493aa284f21b6062a0cff29bda278b4268743e8c67d0270c619e0c0", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v0.1.5
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling libc v0.2.61
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking lazy_static v1.3.0
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking regex-syntax v0.6.11
[INFO] [stderr]     Checking either v1.5.2
[INFO] [stderr]     Checking avltree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: this lifetime isn't used in the impl
[INFO] [stdout]   --> src/set.rs:15:6
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl<'a, T: 'a + Ord> Default for AvlTreeSet<T> {
[INFO] [stdout]    |      ^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes
[INFO] [stdout]    = note: `#[warn(clippy::extra_unused_lifetimes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]   --> src/set.rs:64:42
[INFO] [stdout]    |
[INFO] [stdout] 64 |             match current_node.value.cmp(&value) {
[INFO] [stdout]    |                                          ^^^^^^ help: change this to: `value`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout]    = note: `#[warn(clippy::needless_borrow)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this block may be rewritten with the `?` operator
[INFO] [stdout]   --> src/set.rs:80:9
[INFO] [stdout]    |
[INFO] [stdout] 80 | /         if target_value.is_none() {
[INFO] [stdout] 81 | |             return None;
[INFO] [stdout] 82 | |         }
[INFO] [stdout]    | |_________^ help: replace it with: `target_value.as_ref()?;`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#question_mark
[INFO] [stdout]    = note: `#[warn(clippy::question_mark)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]    --> src/set.rs:174:42
[INFO] [stdout]     |
[INFO] [stdout] 174 |             match current_node.value.cmp(&value) {
[INFO] [stdout]     |                                          ^^^^^^ help: change this to: `value`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]    --> src/set.rs:194:42
[INFO] [stdout]     |
[INFO] [stdout] 194 |             match current_node.value.cmp(&value) {
[INFO] [stdout]     |                                          ^^^^^^ help: change this to: `value`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]    --> src/set.rs:273:40
[INFO] [stdout]     |
[INFO] [stdout] 273 |             left_iter: self.difference(&other).peekable(),
[INFO] [stdout]     |                                        ^^^^^^ help: change this to: `other`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]    --> src/set.rs:274:42
[INFO] [stdout]     |
[INFO] [stdout] 274 |             right_iter: other.difference(&self).peekable(),
[INFO] [stdout]     |                                          ^^^^^ help: change this to: `self`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]    --> src/set.rs:317:46
[INFO] [stdout]     |
[INFO] [stdout] 317 |                         self.prev_nodes.push(&current_node);
[INFO] [stdout]     |                                              ^^^^^^^^^^^^^ help: change this to: `current_node`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this pattern creates a reference to a reference
[INFO] [stdout]    --> src/set.rs:308:26
[INFO] [stdout]     |
[INFO] [stdout] 308 |                     Some(ref prev_node) => {
[INFO] [stdout]     |                          ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout] help: try
[INFO] [stdout]     |
[INFO] [stdout] 308 -                     Some(ref prev_node) => {
[INFO] [stdout] 308 +                     Some(prev_node) => {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]    --> src/set.rs:349:37
[INFO] [stdout]     |
[INFO] [stdout] 349 |                 match left_node.cmp(&right_node) {
[INFO] [stdout]     |                                     ^^^^^^^^^^^ help: change this to: `right_node`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this lifetime isn't used in the impl
[INFO] [stdout]   --> src/tree.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl<'a, T: 'a + Ord> AvlNode<T> {
[INFO] [stdout]    |      ^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/set.rs:118:17
[INFO] [stdout]     |
[INFO] [stdout] 118 |                 replace(&mut target_node.right, right_node.right.take());
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 118 |                 let _ = replace(&mut target_node.right, right_node.right.take());
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/set.rs:139:17
[INFO] [stdout]     |
[INFO] [stdout] 139 |                 replace(&mut parent_left_node.left, leftmost_node.right.take());
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 139 |                 let _ = replace(&mut parent_left_node.left, leftmost_node.right.take());
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking itertools v0.8.0
[INFO] [stdout] warning: casting integer literal to `u32` is unnecessary
[INFO] [stdout]  --> src/bin/bin.rs:5:23
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let mut set = (1..10_000 as u32).rev().collect::<AvlTreeSet<_>>();
[INFO] [stdout]   |                       ^^^^^^^^^^^^^ help: try: `10_000_u32`
[INFO] [stdout]   |
[INFO] [stdout]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout]   = note: `#[warn(clippy::unnecessary_cast)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking aho-corasick v0.7.6
[INFO] [stderr]     Checking regex v1.2.1
[INFO] [stderr]     Checking env_logger v0.6.2
[INFO] [stderr]     Checking quickcheck v0.8.5
[INFO] [stderr]    Compiling quickcheck_macros v0.8.0
[INFO] [stdout] warning: casting integer literal to `u32` is unnecessary
[INFO] [stdout]  --> src/bin/bin.rs:5:23
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let mut set = (1..10_000 as u32).rev().collect::<AvlTreeSet<_>>();
[INFO] [stdout]   |                       ^^^^^^^^^^^^^ help: try: `10_000_u32`
[INFO] [stdout]   |
[INFO] [stdout]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout]   = note: `#[warn(clippy::unnecessary_cast)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this lifetime isn't used in the impl
[INFO] [stdout]   --> src/set.rs:15:6
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl<'a, T: 'a + Ord> Default for AvlTreeSet<T> {
[INFO] [stdout]    |      ^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes
[INFO] [stdout]    = note: `#[warn(clippy::extra_unused_lifetimes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]   --> src/set.rs:64:42
[INFO] [stdout]    |
[INFO] [stdout] 64 |             match current_node.value.cmp(&value) {
[INFO] [stdout]    |                                          ^^^^^^ help: change this to: `value`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout]    = note: `#[warn(clippy::needless_borrow)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this block may be rewritten with the `?` operator
[INFO] [stdout]   --> src/set.rs:80:9
[INFO] [stdout]    |
[INFO] [stdout] 80 | /         if target_value.is_none() {
[INFO] [stdout] 81 | |             return None;
[INFO] [stdout] 82 | |         }
[INFO] [stdout]    | |_________^ help: replace it with: `target_value.as_ref()?;`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#question_mark
[INFO] [stdout]    = note: `#[warn(clippy::question_mark)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]    --> src/set.rs:174:42
[INFO] [stdout]     |
[INFO] [stdout] 174 |             match current_node.value.cmp(&value) {
[INFO] [stdout]     |                                          ^^^^^^ help: change this to: `value`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]    --> src/set.rs:194:42
[INFO] [stdout]     |
[INFO] [stdout] 194 |             match current_node.value.cmp(&value) {
[INFO] [stdout]     |                                          ^^^^^^ help: change this to: `value`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]    --> src/set.rs:273:40
[INFO] [stdout]     |
[INFO] [stdout] 273 |             left_iter: self.difference(&other).peekable(),
[INFO] [stdout]     |                                        ^^^^^^ help: change this to: `other`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]    --> src/set.rs:274:42
[INFO] [stdout]     |
[INFO] [stdout] 274 |             right_iter: other.difference(&self).peekable(),
[INFO] [stdout]     |                                          ^^^^^ help: change this to: `self`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]    --> src/set.rs:317:46
[INFO] [stdout]     |
[INFO] [stdout] 317 |                         self.prev_nodes.push(&current_node);
[INFO] [stdout]     |                                              ^^^^^^^^^^^^^ help: change this to: `current_node`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this pattern creates a reference to a reference
[INFO] [stdout]    --> src/set.rs:308:26
[INFO] [stdout]     |
[INFO] [stdout] 308 |                     Some(ref prev_node) => {
[INFO] [stdout]     |                          ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout] help: try
[INFO] [stdout]     |
[INFO] [stdout] 308 -                     Some(ref prev_node) => {
[INFO] [stdout] 308 +                     Some(prev_node) => {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]    --> src/set.rs:349:37
[INFO] [stdout]     |
[INFO] [stdout] 349 |                 match left_node.cmp(&right_node) {
[INFO] [stdout]     |                                     ^^^^^^^^^^^ help: change this to: `right_node`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]    --> src/set.rs:417:12
[INFO] [stdout]     |
[INFO] [stdout] 417 |         if !set.root.is_some() {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^ help: try: `set.root.is_none()`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout]     = note: `#[warn(clippy::nonminimal_bool)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]    --> src/set.rs:430:12
[INFO] [stdout]     |
[INFO] [stdout] 430 |         if !set.root.is_some() {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^ help: try: `set.root.is_none()`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]    --> src/set.rs:448:12
[INFO] [stdout]     |
[INFO] [stdout] 448 |         if !set.root.is_some() {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^ help: try: `set.root.is_none()`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]    --> src/set.rs:467:12
[INFO] [stdout]     |
[INFO] [stdout] 467 |         if !set.root.is_some() {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^ help: try: `set.root.is_none()`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this lifetime isn't used in the impl
[INFO] [stdout]   --> src/tree.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl<'a, T: 'a + Ord> AvlNode<T> {
[INFO] [stdout]    |      ^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/set.rs:118:17
[INFO] [stdout]     |
[INFO] [stdout] 118 |                 replace(&mut target_node.right, right_node.right.take());
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 118 |                 let _ = replace(&mut target_node.right, right_node.right.take());
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/set.rs:139:17
[INFO] [stdout]     |
[INFO] [stdout] 139 |                 replace(&mut parent_left_node.left, leftmost_node.right.take());
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 139 |                 let _ = replace(&mut parent_left_node.left, leftmost_node.right.take());
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.00s
[INFO] running `Command { std: "docker" "inspect" "e562da024493aa284f21b6062a0cff29bda278b4268743e8c67d0270c619e0c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e562da024493aa284f21b6062a0cff29bda278b4268743e8c67d0270c619e0c0", kill_on_drop: false }`
[INFO] [stdout] e562da024493aa284f21b6062a0cff29bda278b4268743e8c67d0270c619e0c0