[INFO] fetching crate toy_arena 0.2.0...
[INFO] testing toy_arena-0.2.0 against master#cdb45c87e2cd43495379f7e867e3cc15dcee9f93 for pr-145838-1
[INFO] extracting crate toy_arena 0.2.0 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate toy_arena 0.2.0
[INFO] finished tweaking crates.io crate toy_arena 0.2.0
[INFO] tweaked toml for crates.io crate toy_arena 0.2.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate toy_arena 0.2.0 on toolchain cdb45c87e2cd43495379f7e867e3cc15dcee9f93
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 5 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 983257d1594aa444f617169e4279a4ce346b594f75f1b33fd1c17d2cc80b9f4f
[INFO] running `Command { std: "docker" "start" "-a" "983257d1594aa444f617169e4279a4ce346b594f75f1b33fd1c17d2cc80b9f4f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "983257d1594aa444f617169e4279a4ce346b594f75f1b33fd1c17d2cc80b9f4f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "983257d1594aa444f617169e4279a4ce346b594f75f1b33fd1c17d2cc80b9f4f", kill_on_drop: false }`
[INFO] [stdout] 983257d1594aa444f617169e4279a4ce346b594f75f1b33fd1c17d2cc80b9f4f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7b8992ccfee6ad51c6bad56bb0f06532d773b0c6173520d742ba7be471706d6f
[INFO] running `Command { std: "docker" "start" "-a" "7b8992ccfee6ad51c6bad56bb0f06532d773b0c6173520d742ba7be471706d6f", kill_on_drop: false }`
[INFO] [stderr]    Compiling derivative v2.2.0
[INFO] [stderr]    Compiling toy_arena v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:340:13
[INFO] [stdout]     |
[INFO] [stdout] 340 |         let mut slot_states = self.slot_states.get_mut();
[INFO] [stdout]     |             ----^^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `set_parent` is never used
[INFO] [stdout]   --> src/tree/link.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 37 | impl Link {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 49 |     pub fn set_parent(&mut self, parent: Option<Slot>) {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/lib.rs:428:13
[INFO] [stdout]     |
[INFO] [stdout] 428 |             drop(slot_states);
[INFO] [stdout]     |             ^^^^^-----------^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  argument has type `&mut SlotStates`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 428 -             drop(slot_states);
[INFO] [stdout] 428 +             let _ = slot_states;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:617:17
[INFO] [stdout]     |
[INFO] [stdout] 617 |     pub fn iter(&self) -> IndexedItemIter<T, D, G> {
[INFO] [stdout]     |                 ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 617 |     pub fn iter(&self) -> IndexedItemIter<'_, T, D, G> {
[INFO] [stdout]     |                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:627:21
[INFO] [stdout]     |
[INFO] [stdout] 627 |     pub fn iter_mut(&mut self) -> IndexedItemIterMut<T, D, G> {
[INFO] [stdout]     |                     ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 627 |     pub fn iter_mut(&mut self) -> IndexedItemIterMut<'_, T, D, G> {
[INFO] [stdout]     |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:637:18
[INFO] [stdout]     |
[INFO] [stdout] 637 |     pub fn items(&self) -> ItemIter<T, G> {
[INFO] [stdout]     |                  ^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 637 |     pub fn items(&self) -> ItemIter<'_, T, G> {
[INFO] [stdout]     |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:646:22
[INFO] [stdout]     |
[INFO] [stdout] 646 |     pub fn items_mut(&mut self) -> ItemIterMut<T, G> {
[INFO] [stdout]     |                      ^^^^^^^^^     ^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 646 |     pub fn items_mut(&mut self) -> ItemIterMut<'_, T, G> {
[INFO] [stdout]     |                                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:655:18
[INFO] [stdout]     |
[INFO] [stdout] 655 |     pub fn drain(&mut self) -> Drain<T, D, G> {
[INFO] [stdout]     |                  ^^^^^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 655 |     pub fn drain(&mut self) -> Drain<'_, T, D, G> {
[INFO] [stdout]     |                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:663:21
[INFO] [stdout]     |
[INFO] [stdout] 663 |     pub fn bindings(&mut self) -> EntryBindings<T, D, G> {
[INFO] [stdout]     |                     ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 663 |     pub fn bindings(&mut self) -> EntryBindings<'_, T, D, G> {
[INFO] [stdout]     |                                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:227:20
[INFO] [stdout]     |
[INFO] [stdout] 227 |     pub fn subtree(&self, id: NodeId<T, D, G>) -> iter::Traverse<T, D, G> {
[INFO] [stdout]     |                    ^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                    |
[INFO] [stdout]     |                    the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 227 |     pub fn subtree(&self, id: NodeId<T, D, G>) -> iter::Traverse<'_, T, D, G> {
[INFO] [stdout]     |                                                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:235:21
[INFO] [stdout]     |
[INFO] [stdout] 235 |     pub fn traverse(&self, id: NodeId<T, D, G>) -> iter::Traverse<T, D, G> {
[INFO] [stdout]     |                     ^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 235 |     pub fn traverse(&self, id: NodeId<T, D, G>) -> iter::Traverse<'_, T, D, G> {
[INFO] [stdout]     |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:244:32
[INFO] [stdout]     |
[INFO] [stdout] 244 |     pub fn traverse_root_nodes(&self) -> iter::Traverse<T, D, G> {
[INFO] [stdout]     |                                ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                                |
[INFO] [stdout]     |                                the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 244 |     pub fn traverse_root_nodes(&self) -> iter::Traverse<'_, T, D, G> {
[INFO] [stdout]     |                                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:257:21
[INFO] [stdout]     |
[INFO] [stdout] 257 |     pub fn siblings(&self, id: NodeId<T, D, G>) -> iter::Traverse<T, D, G> {
[INFO] [stdout]     |                     ^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 257 |     pub fn siblings(&self, id: NodeId<T, D, G>) -> iter::Traverse<'_, T, D, G> {
[INFO] [stdout]     |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:266:21
[INFO] [stdout]     |
[INFO] [stdout] 266 |     pub fn children(&mut self, id: NodeId<T, D, G>) -> iter::SiblingsNext<T, D, G> {
[INFO] [stdout]     |                     ^^^^^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 266 |     pub fn children(&mut self, id: NodeId<T, D, G>) -> iter::SiblingsNext<'_, T, D, G> {
[INFO] [stdout]     |                                                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:275:25
[INFO] [stdout]     |
[INFO] [stdout] 275 |     pub fn children_mut(&mut self, id: NodeId<T, D, G>) -> iter_mut::SiblingsMutNext<T, D, G> {
[INFO] [stdout]     |                         ^^^^^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 275 |     pub fn children_mut(&mut self, id: NodeId<T, D, G>) -> iter_mut::SiblingsMutNext<'_, T, D, G> {
[INFO] [stdout]     |                                                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:281:23
[INFO] [stdout]     |
[INFO] [stdout] 281 |     pub fn root_nodes(&self) -> iter::SiblingsNext<T, D, G> {
[INFO] [stdout]     |                       ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                       |
[INFO] [stdout]     |                       the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 281 |     pub fn root_nodes(&self) -> iter::SiblingsNext<'_, T, D, G> {
[INFO] [stdout]     |                                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:289:27
[INFO] [stdout]     |
[INFO] [stdout] 289 |     pub fn root_nodes_mut(&mut self) -> iter_mut::SiblingsMutNext<T, D, G> {
[INFO] [stdout]     |                           ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 289 |     pub fn root_nodes_mut(&mut self) -> iter_mut::SiblingsMutNext<'_, T, D, G> {
[INFO] [stdout]     |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.40s
[INFO] running `Command { std: "docker" "inspect" "7b8992ccfee6ad51c6bad56bb0f06532d773b0c6173520d742ba7be471706d6f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7b8992ccfee6ad51c6bad56bb0f06532d773b0c6173520d742ba7be471706d6f", kill_on_drop: false }`
[INFO] [stdout] 7b8992ccfee6ad51c6bad56bb0f06532d773b0c6173520d742ba7be471706d6f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a10140137905eb1189aff58f782058bbf93476bbdfcd8e2d209305ed264943ad
[INFO] running `Command { std: "docker" "start" "-a" "a10140137905eb1189aff58f782058bbf93476bbdfcd8e2d209305ed264943ad", kill_on_drop: false }`
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:340:13
[INFO] [stdout]     |
[INFO] [stdout] 340 |         let mut slot_states = self.slot_states.get_mut();
[INFO] [stdout]     |             ----^^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `set_parent` is never used
[INFO] [stdout]   --> src/tree/link.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 37 | impl Link {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 49 |     pub fn set_parent(&mut self, parent: Option<Slot>) {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/lib.rs:428:13
[INFO] [stdout]     |
[INFO] [stdout] 428 |             drop(slot_states);
[INFO] [stdout]     |             ^^^^^-----------^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  argument has type `&mut SlotStates`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 428 -             drop(slot_states);
[INFO] [stdout] 428 +             let _ = slot_states;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:617:17
[INFO] [stdout]     |
[INFO] [stdout] 617 |     pub fn iter(&self) -> IndexedItemIter<T, D, G> {
[INFO] [stdout]     |                 ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 617 |     pub fn iter(&self) -> IndexedItemIter<'_, T, D, G> {
[INFO] [stdout]     |                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:627:21
[INFO] [stdout]     |
[INFO] [stdout] 627 |     pub fn iter_mut(&mut self) -> IndexedItemIterMut<T, D, G> {
[INFO] [stdout]     |                     ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 627 |     pub fn iter_mut(&mut self) -> IndexedItemIterMut<'_, T, D, G> {
[INFO] [stdout]     |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:637:18
[INFO] [stdout]     |
[INFO] [stdout] 637 |     pub fn items(&self) -> ItemIter<T, G> {
[INFO] [stdout]     |                  ^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 637 |     pub fn items(&self) -> ItemIter<'_, T, G> {
[INFO] [stdout]     |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:646:22
[INFO] [stdout]     |
[INFO] [stdout] 646 |     pub fn items_mut(&mut self) -> ItemIterMut<T, G> {
[INFO] [stdout]     |                      ^^^^^^^^^     ^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 646 |     pub fn items_mut(&mut self) -> ItemIterMut<'_, T, G> {
[INFO] [stdout]     |                                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:655:18
[INFO] [stdout]     |
[INFO] [stdout] 655 |     pub fn drain(&mut self) -> Drain<T, D, G> {
[INFO] [stdout]     |                  ^^^^^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 655 |     pub fn drain(&mut self) -> Drain<'_, T, D, G> {
[INFO] [stdout]     |                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:663:21
[INFO] [stdout]     |
[INFO] [stdout] 663 |     pub fn bindings(&mut self) -> EntryBindings<T, D, G> {
[INFO] [stdout]     |                     ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 663 |     pub fn bindings(&mut self) -> EntryBindings<'_, T, D, G> {
[INFO] [stdout]     |                                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:227:20
[INFO] [stdout]     |
[INFO] [stdout] 227 |     pub fn subtree(&self, id: NodeId<T, D, G>) -> iter::Traverse<T, D, G> {
[INFO] [stdout]     |                    ^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                    |
[INFO] [stdout]     |                    the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 227 |     pub fn subtree(&self, id: NodeId<T, D, G>) -> iter::Traverse<'_, T, D, G> {
[INFO] [stdout]     |                                                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:235:21
[INFO] [stdout]     |
[INFO] [stdout] 235 |     pub fn traverse(&self, id: NodeId<T, D, G>) -> iter::Traverse<T, D, G> {
[INFO] [stdout]     |                     ^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 235 |     pub fn traverse(&self, id: NodeId<T, D, G>) -> iter::Traverse<'_, T, D, G> {
[INFO] [stdout]     |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:244:32
[INFO] [stdout]     |
[INFO] [stdout] 244 |     pub fn traverse_root_nodes(&self) -> iter::Traverse<T, D, G> {
[INFO] [stdout]     |                                ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                                |
[INFO] [stdout]     |                                the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 244 |     pub fn traverse_root_nodes(&self) -> iter::Traverse<'_, T, D, G> {
[INFO] [stdout]     |                                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:257:21
[INFO] [stdout]     |
[INFO] [stdout] 257 |     pub fn siblings(&self, id: NodeId<T, D, G>) -> iter::Traverse<T, D, G> {
[INFO] [stdout]     |                     ^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 257 |     pub fn siblings(&self, id: NodeId<T, D, G>) -> iter::Traverse<'_, T, D, G> {
[INFO] [stdout]     |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:266:21
[INFO] [stdout]     |
[INFO] [stdout] 266 |     pub fn children(&mut self, id: NodeId<T, D, G>) -> iter::SiblingsNext<T, D, G> {
[INFO] [stdout]     |                     ^^^^^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 266 |     pub fn children(&mut self, id: NodeId<T, D, G>) -> iter::SiblingsNext<'_, T, D, G> {
[INFO] [stdout]     |                                                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:275:25
[INFO] [stdout]     |
[INFO] [stdout] 275 |     pub fn children_mut(&mut self, id: NodeId<T, D, G>) -> iter_mut::SiblingsMutNext<T, D, G> {
[INFO] [stdout]     |                         ^^^^^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 275 |     pub fn children_mut(&mut self, id: NodeId<T, D, G>) -> iter_mut::SiblingsMutNext<'_, T, D, G> {
[INFO] [stdout]     |                                                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:281:23
[INFO] [stdout]     |
[INFO] [stdout] 281 |     pub fn root_nodes(&self) -> iter::SiblingsNext<T, D, G> {
[INFO] [stdout]     |                       ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                       |
[INFO] [stdout]     |                       the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 281 |     pub fn root_nodes(&self) -> iter::SiblingsNext<'_, T, D, G> {
[INFO] [stdout]     |                                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:289:27
[INFO] [stdout]     |
[INFO] [stdout] 289 |     pub fn root_nodes_mut(&mut self) -> iter_mut::SiblingsMutNext<T, D, G> {
[INFO] [stdout]     |                           ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 289 |     pub fn root_nodes_mut(&mut self) -> iter_mut::SiblingsMutNext<'_, T, D, G> {
[INFO] [stdout]     |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling toy_arena v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:340:13
[INFO] [stdout]     |
[INFO] [stdout] 340 |         let mut slot_states = self.slot_states.get_mut();
[INFO] [stdout]     |             ----^^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `set_parent` is never used
[INFO] [stdout]   --> src/tree/link.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 37 | impl Link {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 49 |     pub fn set_parent(&mut self, parent: Option<Slot>) {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/lib.rs:428:13
[INFO] [stdout]     |
[INFO] [stdout] 428 |             drop(slot_states);
[INFO] [stdout]     |             ^^^^^-----------^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  argument has type `&mut SlotStates`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 428 -             drop(slot_states);
[INFO] [stdout] 428 +             let _ = slot_states;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:617:17
[INFO] [stdout]     |
[INFO] [stdout] 617 |     pub fn iter(&self) -> IndexedItemIter<T, D, G> {
[INFO] [stdout]     |                 ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 617 |     pub fn iter(&self) -> IndexedItemIter<'_, T, D, G> {
[INFO] [stdout]     |                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:627:21
[INFO] [stdout]     |
[INFO] [stdout] 627 |     pub fn iter_mut(&mut self) -> IndexedItemIterMut<T, D, G> {
[INFO] [stdout]     |                     ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 627 |     pub fn iter_mut(&mut self) -> IndexedItemIterMut<'_, T, D, G> {
[INFO] [stdout]     |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:637:18
[INFO] [stdout]     |
[INFO] [stdout] 637 |     pub fn items(&self) -> ItemIter<T, G> {
[INFO] [stdout]     |                  ^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 637 |     pub fn items(&self) -> ItemIter<'_, T, G> {
[INFO] [stdout]     |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:646:22
[INFO] [stdout]     |
[INFO] [stdout] 646 |     pub fn items_mut(&mut self) -> ItemIterMut<T, G> {
[INFO] [stdout]     |                      ^^^^^^^^^     ^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 646 |     pub fn items_mut(&mut self) -> ItemIterMut<'_, T, G> {
[INFO] [stdout]     |                                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:655:18
[INFO] [stdout]     |
[INFO] [stdout] 655 |     pub fn drain(&mut self) -> Drain<T, D, G> {
[INFO] [stdout]     |                  ^^^^^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 655 |     pub fn drain(&mut self) -> Drain<'_, T, D, G> {
[INFO] [stdout]     |                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:663:21
[INFO] [stdout]     |
[INFO] [stdout] 663 |     pub fn bindings(&mut self) -> EntryBindings<T, D, G> {
[INFO] [stdout]     |                     ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 663 |     pub fn bindings(&mut self) -> EntryBindings<'_, T, D, G> {
[INFO] [stdout]     |                                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:227:20
[INFO] [stdout]     |
[INFO] [stdout] 227 |     pub fn subtree(&self, id: NodeId<T, D, G>) -> iter::Traverse<T, D, G> {
[INFO] [stdout]     |                    ^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                    |
[INFO] [stdout]     |                    the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 227 |     pub fn subtree(&self, id: NodeId<T, D, G>) -> iter::Traverse<'_, T, D, G> {
[INFO] [stdout]     |                                                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:235:21
[INFO] [stdout]     |
[INFO] [stdout] 235 |     pub fn traverse(&self, id: NodeId<T, D, G>) -> iter::Traverse<T, D, G> {
[INFO] [stdout]     |                     ^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 235 |     pub fn traverse(&self, id: NodeId<T, D, G>) -> iter::Traverse<'_, T, D, G> {
[INFO] [stdout]     |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:244:32
[INFO] [stdout]     |
[INFO] [stdout] 244 |     pub fn traverse_root_nodes(&self) -> iter::Traverse<T, D, G> {
[INFO] [stdout]     |                                ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                                |
[INFO] [stdout]     |                                the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 244 |     pub fn traverse_root_nodes(&self) -> iter::Traverse<'_, T, D, G> {
[INFO] [stdout]     |                                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:257:21
[INFO] [stdout]     |
[INFO] [stdout] 257 |     pub fn siblings(&self, id: NodeId<T, D, G>) -> iter::Traverse<T, D, G> {
[INFO] [stdout]     |                     ^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 257 |     pub fn siblings(&self, id: NodeId<T, D, G>) -> iter::Traverse<'_, T, D, G> {
[INFO] [stdout]     |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:266:21
[INFO] [stdout]     |
[INFO] [stdout] 266 |     pub fn children(&mut self, id: NodeId<T, D, G>) -> iter::SiblingsNext<T, D, G> {
[INFO] [stdout]     |                     ^^^^^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 266 |     pub fn children(&mut self, id: NodeId<T, D, G>) -> iter::SiblingsNext<'_, T, D, G> {
[INFO] [stdout]     |                                                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:275:25
[INFO] [stdout]     |
[INFO] [stdout] 275 |     pub fn children_mut(&mut self, id: NodeId<T, D, G>) -> iter_mut::SiblingsMutNext<T, D, G> {
[INFO] [stdout]     |                         ^^^^^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 275 |     pub fn children_mut(&mut self, id: NodeId<T, D, G>) -> iter_mut::SiblingsMutNext<'_, T, D, G> {
[INFO] [stdout]     |                                                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:281:23
[INFO] [stdout]     |
[INFO] [stdout] 281 |     pub fn root_nodes(&self) -> iter::SiblingsNext<T, D, G> {
[INFO] [stdout]     |                       ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                       |
[INFO] [stdout]     |                       the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 281 |     pub fn root_nodes(&self) -> iter::SiblingsNext<'_, T, D, G> {
[INFO] [stdout]     |                                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/tree.rs:289:27
[INFO] [stdout]     |
[INFO] [stdout] 289 |     pub fn root_nodes_mut(&mut self) -> iter_mut::SiblingsMutNext<T, D, G> {
[INFO] [stdout]     |                           ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 289 |     pub fn root_nodes_mut(&mut self) -> iter_mut::SiblingsMutNext<'_, T, D, G> {
[INFO] [stdout]     |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.03s
[INFO] running `Command { std: "docker" "inspect" "a10140137905eb1189aff58f782058bbf93476bbdfcd8e2d209305ed264943ad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a10140137905eb1189aff58f782058bbf93476bbdfcd8e2d209305ed264943ad", kill_on_drop: false }`
[INFO] [stdout] a10140137905eb1189aff58f782058bbf93476bbdfcd8e2d209305ed264943ad
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 3c54a388571165672b25e6b2b66253c48193d704743a9acfe8075c3a6d30dbcd
[INFO] running `Command { std: "docker" "start" "-a" "3c54a388571165672b25e6b2b66253c48193d704743a9acfe8075c3a6d30dbcd", kill_on_drop: false }`
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:340:13
[INFO] [stderr]     |
[INFO] [stderr] 340 |         let mut slot_states = self.slot_states.get_mut();
[INFO] [stderr]     |             ----^^^^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method `set_parent` is never used
[INFO] [stderr]   --> src/tree/link.rs:49:12
[INFO] [stderr]    |
[INFO] [stderr] 37 | impl Link {
[INFO] [stderr]    | --------- method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 49 |     pub fn set_parent(&mut self, parent: Option<Slot>) {
[INFO] [stderr]    |            ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stderr]    --> src/lib.rs:428:13
[INFO] [stderr]     |
[INFO] [stderr] 428 |             drop(slot_states);
[INFO] [stderr]     |             ^^^^^-----------^
[INFO] [stderr]     |                  |
[INFO] [stderr]     |                  argument has type `&mut SlotStates`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the expression or result
[INFO] [stderr]     |
[INFO] [stderr] 428 -             drop(slot_states);
[INFO] [stderr] 428 +             let _ = slot_states;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/lib.rs:617:17
[INFO] [stderr]     |
[INFO] [stderr] 617 |     pub fn iter(&self) -> IndexedItemIter<T, D, G> {
[INFO] [stderr]     |                 ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 617 |     pub fn iter(&self) -> IndexedItemIter<'_, T, D, G> {
[INFO] [stderr]     |                                           +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/lib.rs:627:21
[INFO] [stderr]     |
[INFO] [stderr] 627 |     pub fn iter_mut(&mut self) -> IndexedItemIterMut<T, D, G> {
[INFO] [stderr]     |                     ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 627 |     pub fn iter_mut(&mut self) -> IndexedItemIterMut<'_, T, D, G> {
[INFO] [stderr]     |                                                      +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/lib.rs:637:18
[INFO] [stderr]     |
[INFO] [stderr] 637 |     pub fn items(&self) -> ItemIter<T, G> {
[INFO] [stderr]     |                  ^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                  |
[INFO] [stderr]     |                  the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 637 |     pub fn items(&self) -> ItemIter<'_, T, G> {
[INFO] [stderr]     |                                     +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/lib.rs:646:22
[INFO] [stderr]     |
[INFO] [stderr] 646 |     pub fn items_mut(&mut self) -> ItemIterMut<T, G> {
[INFO] [stderr]     |                      ^^^^^^^^^     ^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                      |
[INFO] [stderr]     |                      the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 646 |     pub fn items_mut(&mut self) -> ItemIterMut<'_, T, G> {
[INFO] [stderr]     |                                                +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/lib.rs:655:18
[INFO] [stderr]     |
[INFO] [stderr] 655 |     pub fn drain(&mut self) -> Drain<T, D, G> {
[INFO] [stderr]     |                  ^^^^^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                  |
[INFO] [stderr]     |                  the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 655 |     pub fn drain(&mut self) -> Drain<'_, T, D, G> {
[INFO] [stderr]     |                                      +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/lib.rs:663:21
[INFO] [stderr]     |
[INFO] [stderr] 663 |     pub fn bindings(&mut self) -> EntryBindings<T, D, G> {
[INFO] [stderr]     |                     ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 663 |     pub fn bindings(&mut self) -> EntryBindings<'_, T, D, G> {
[INFO] [stderr]     |                                                 +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/tree.rs:227:20
[INFO] [stderr]     |
[INFO] [stderr] 227 |     pub fn subtree(&self, id: NodeId<T, D, G>) -> iter::Traverse<T, D, G> {
[INFO] [stderr]     |                    ^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                    |
[INFO] [stderr]     |                    the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 227 |     pub fn subtree(&self, id: NodeId<T, D, G>) -> iter::Traverse<'_, T, D, G> {
[INFO] [stderr]     |                                                                  +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/tree.rs:235:21
[INFO] [stderr]     |
[INFO] [stderr] 235 |     pub fn traverse(&self, id: NodeId<T, D, G>) -> iter::Traverse<T, D, G> {
[INFO] [stderr]     |                     ^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 235 |     pub fn traverse(&self, id: NodeId<T, D, G>) -> iter::Traverse<'_, T, D, G> {
[INFO] [stderr]     |                                                                   +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/tree.rs:244:32
[INFO] [stderr]     |
[INFO] [stderr] 244 |     pub fn traverse_root_nodes(&self) -> iter::Traverse<T, D, G> {
[INFO] [stderr]     |                                ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                                |
[INFO] [stderr]     |                                the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 244 |     pub fn traverse_root_nodes(&self) -> iter::Traverse<'_, T, D, G> {
[INFO] [stderr]     |                                                         +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/tree.rs:257:21
[INFO] [stderr]     |
[INFO] [stderr] 257 |     pub fn siblings(&self, id: NodeId<T, D, G>) -> iter::Traverse<T, D, G> {
[INFO] [stderr]     |                     ^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 257 |     pub fn siblings(&self, id: NodeId<T, D, G>) -> iter::Traverse<'_, T, D, G> {
[INFO] [stderr]     |                                                                   +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/tree.rs:266:21
[INFO] [stderr]     |
[INFO] [stderr] 266 |     pub fn children(&mut self, id: NodeId<T, D, G>) -> iter::SiblingsNext<T, D, G> {
[INFO] [stderr]     |                     ^^^^^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 266 |     pub fn children(&mut self, id: NodeId<T, D, G>) -> iter::SiblingsNext<'_, T, D, G> {
[INFO] [stderr]     |                                                                           +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/tree.rs:275:25
[INFO] [stderr]     |
[INFO] [stderr] 275 |     pub fn children_mut(&mut self, id: NodeId<T, D, G>) -> iter_mut::SiblingsMutNext<T, D, G> {
[INFO] [stderr]     |                         ^^^^^^^^^                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 275 |     pub fn children_mut(&mut self, id: NodeId<T, D, G>) -> iter_mut::SiblingsMutNext<'_, T, D, G> {
[INFO] [stderr]     |                                                                                      +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/tree.rs:281:23
[INFO] [stderr]     |
[INFO] [stderr] 281 |     pub fn root_nodes(&self) -> iter::SiblingsNext<T, D, G> {
[INFO] [stderr]     |                       ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                       |
[INFO] [stderr]     |                       the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 281 |     pub fn root_nodes(&self) -> iter::SiblingsNext<'_, T, D, G> {
[INFO] [stderr]     |                                                    +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/tree.rs:289:27
[INFO] [stderr]     |
[INFO] [stderr] 289 |     pub fn root_nodes_mut(&mut self) -> iter_mut::SiblingsMutNext<T, D, G> {
[INFO] [stderr]     |                           ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                           |
[INFO] [stderr]     |                           the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 289 |     pub fn root_nodes_mut(&mut self) -> iter_mut::SiblingsMutNext<'_, T, D, G> {
[INFO] [stderr]     |                                                                   +++
[INFO] [stderr] 
[INFO] [stderr] warning: `toy_arena` (lib) generated 17 warnings (run `cargo fix --lib -p toy_arena` to apply 15 suggestions)
[INFO] [stderr] warning: `toy_arena` (lib test) generated 17 warnings (17 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/toy_arena-bdb3246fd77c61a7)
[INFO] [stdout] 
[INFO] [stdout] running 10 tests
[INFO] [stderr]    Doc-tests toy_arena
[INFO] [stdout] test test::entry_bind ... ok
[INFO] [stdout] test test::entry_binds ... ok
[INFO] [stdout] test test::drain ... ok
[INFO] [stdout] test test::gen_macro ... ok
[INFO] [stdout] test test::insert_remove_invalidate_replace ... ok
[INFO] [stdout] test test::retain ... ok
[INFO] [stdout] test tree::test::automatic_traverse ... ok
[INFO] [stdout] test tree::test::manual_traverse ... ok
[INFO] [stdout] test tree::test::tree_macro_test ... ok
[INFO] [stdout] test tree::test::tree_remove ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 10 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test src/_example.rs - _example (line 62) ... ok
[INFO] [stdout] test src/_example.rs - _example (line 7) ... ok
[INFO] [stdout] test src/lib.rs - Index (line 124) ... ok
[INFO] [stdout] test src/_example.rs - _example (line 40) ... ok
[INFO] [stdout] test src/lib.rs - arena (line 713) ... ok
[INFO] [stdout] test src/tree.rs - tree::tree (line 326) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.65s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "3c54a388571165672b25e6b2b66253c48193d704743a9acfe8075c3a6d30dbcd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c54a388571165672b25e6b2b66253c48193d704743a9acfe8075c3a6d30dbcd", kill_on_drop: false }`
[INFO] [stdout] 3c54a388571165672b25e6b2b66253c48193d704743a9acfe8075c3a6d30dbcd