[INFO] cloning repository https://github.com/u1roh/graph_in_rust_with_unsafe
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/u1roh/graph_in_rust_with_unsafe" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fu1roh%2Fgraph_in_rust_with_unsafe", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fu1roh%2Fgraph_in_rust_with_unsafe'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 05589b16939a5f01e51d2bdd5167cc70fc0fe4f2
[INFO] testing u1roh/graph_in_rust_with_unsafe against try#db823df02fd0c2cf67b43025ac3fef3f2d743245 for pr-150681
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fu1roh%2Fgraph_in_rust_with_unsafe" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/u1roh/graph_in_rust_with_unsafe
[INFO] finished tweaking git repo https://github.com/u1roh/graph_in_rust_with_unsafe
[INFO] tweaked toml for git repo https://github.com/u1roh/graph_in_rust_with_unsafe written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/u1roh/graph_in_rust_with_unsafe on toolchain db823df02fd0c2cf67b43025ac3fef3f2d743245
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+db823df02fd0c2cf67b43025ac3fef3f2d743245" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/u1roh/graph_in_rust_with_unsafe 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" "+db823df02fd0c2cf67b43025ac3fef3f2d743245" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating git repository `https://github.com/u1roh/mepoo.git`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded c2-chacha v0.2.3
[INFO] [stderr]   Downloaded ppv-lite86 v0.2.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+db823df02fd0c2cf67b43025ac3fef3f2d743245" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 874639e0b9571de7787719f151cef29b5918589c0ed6e45670e01c9e917c212f
[INFO] running `Command { std: "docker" "start" "-a" "874639e0b9571de7787719f151cef29b5918589c0ed6e45670e01c9e917c212f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "874639e0b9571de7787719f151cef29b5918589c0ed6e45670e01c9e917c212f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "874639e0b9571de7787719f151cef29b5918589c0ed6e45670e01c9e917c212f", kill_on_drop: false }`
[INFO] [stdout] 874639e0b9571de7787719f151cef29b5918589c0ed6e45670e01c9e917c212f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+db823df02fd0c2cf67b43025ac3fef3f2d743245" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 396b2925aa983b02d45eafb578e3840ced4e4fb7d001f3a6a4679389a93f7d24
[INFO] running `Command { std: "docker" "start" "-a" "396b2925aa983b02d45eafb578e3840ced4e4fb7d001f3a6a4679389a93f7d24", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling ppv-lite86 v0.2.6
[INFO] [stderr]    Compiling typed-arena v2.0.1
[INFO] [stderr]    Compiling mepoo v0.1.0 (https://github.com/u1roh/mepoo.git#dd29e280)
[INFO] [stderr]    Compiling c2-chacha v0.2.3
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.1
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling graph_in_rust_with_unsafe v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `list::*`
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:357:9
[INFO] [stdout]     |
[INFO] [stdout] 357 | pub use list::*;
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]   --> src/test05_nodes_in_hashmap.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 48 |     pub struct Node<T> {
[INFO] [stdout]    |                ---- field in this struct
[INFO] [stdout] 49 |         value: Option<T>,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `is_sentinel` and `value` are never used
[INFO] [stdout]   --> src/test05_nodes_in_hashmap.rs:54:16
[INFO] [stdout]    |
[INFO] [stdout] 53 |     impl<T> Node<T> {
[INFO] [stdout]    |     --------------- methods in this implementation
[INFO] [stdout] 54 |         pub fn is_sentinel(&self) -> bool {
[INFO] [stdout]    |                ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 63 |         pub fn value(&self) -> &T {
[INFO] [stdout]    |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NodeMut` is never constructed
[INFO] [stdout]   --> src/test05_nodes_in_hashmap.rs:69:16
[INFO] [stdout]    |
[INFO] [stdout] 69 |     pub struct NodeMut<'a, T>(&'a mut Node<T>);
[INFO] [stdout]    |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `sentinel`, `get_mut_unchecked`, `get_mut`, `tail`, `is_empty`, and `push_front` are never used
[INFO] [stdout]    --> src/test05_nodes_in_hashmap.rs:99:16
[INFO] [stdout]     |
[INFO] [stdout]  86 |     impl<T> List<T> {
[INFO] [stdout]     |     --------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout]  99 |         pub fn sentinel(&self) -> *const Node<T> {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 115 |         pub unsafe fn get_mut_unchecked(&mut self, ptr: *const Node<T>) -> Option<&mut Node<T>> {
[INFO] [stdout]     |                       ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 120 |         pub fn get_mut(&mut self, ptr: *const Node<T>) -> Option<NodeMut<T>> {
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 127 |         pub fn tail(&self) -> &Node<T> {
[INFO] [stdout]     |                ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 130 |         pub fn is_empty(&self) -> bool {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 155 |         pub fn push_front(&mut self, value: T) {
[INFO] [stdout]     |                ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]  --> src/test06_nodes_in_mepoo.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     pub struct Node<T> {
[INFO] [stdout]   |                ---- field in this struct
[INFO] [stdout] 6 |         value: Option<T>,
[INFO] [stdout]   |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `is_sentinel` and `value` are never used
[INFO] [stdout]   --> src/test06_nodes_in_mepoo.rs:11:16
[INFO] [stdout]    |
[INFO] [stdout] 10 |     impl<T> Node<T> {
[INFO] [stdout]    |     --------------- methods in this implementation
[INFO] [stdout] 11 |         pub fn is_sentinel(&self) -> bool {
[INFO] [stdout]    |                ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 20 |         pub fn value(&self) -> &T {
[INFO] [stdout]    |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NodeMut` is never constructed
[INFO] [stdout]   --> src/test06_nodes_in_mepoo.rs:26:16
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub struct NodeMut<'a, T>(&'a mut Node<T>);
[INFO] [stdout]    |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `get_mut_unchecked`, `get_mut`, `tail`, `is_empty`, and `push_front` are never used
[INFO] [stdout]    --> src/test06_nodes_in_mepoo.rs:64:23
[INFO] [stdout]     |
[INFO] [stdout]  43 |     impl<T> List<T> {
[INFO] [stdout]     |     --------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout]  64 |         pub unsafe fn get_mut_unchecked(&mut self, ptr: Ptr<Node<T>>) -> Option<&mut Node<T>> {
[INFO] [stdout]     |                       ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  67 |         pub fn get_mut(&mut self, ptr: Ptr<Node<T>>) -> Option<NodeMut<T>> {
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  73 |         pub fn tail(&self) -> Ref<Node<T>> {
[INFO] [stdout]     |                ^^^^
[INFO] [stdout] ...
[INFO] [stdout]  76 |         pub fn is_empty(&self) -> bool {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 100 |         pub fn push_front(&mut self, value: T) {
[INFO] [stdout]     |                ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/test07_nodes_in_arena.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 |     struct Node<'a, T> {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Graph` is never constructed
[INFO] [stdout]   --> src/test07_nodes_in_arena.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 |     struct Graph<'a, T> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]   --> src/test07_nodes_in_arena.rs:56:16
[INFO] [stdout]    |
[INFO] [stdout] 56 |     pub struct Node<T> {
[INFO] [stdout]    |                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Graph` is never constructed
[INFO] [stdout]   --> src/test07_nodes_in_arena.rs:61:16
[INFO] [stdout]    |
[INFO] [stdout] 61 |     pub struct Graph<T> {
[INFO] [stdout]    |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NodeRefMut` is never constructed
[INFO] [stdout]   --> src/test07_nodes_in_arena.rs:66:16
[INFO] [stdout]    |
[INFO] [stdout] 66 |     pub struct NodeRefMut<'a, T>(&'a mut Node<T>);
[INFO] [stdout]    |                ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `value`, `value_mut`, and `other` are never used
[INFO] [stdout]   --> src/test07_nodes_in_arena.rs:68:16
[INFO] [stdout]    |
[INFO] [stdout] 67 |     impl<'a, T> NodeRefMut<'a, T> {
[INFO] [stdout]    |     ----------------------------- methods in this implementation
[INFO] [stdout] 68 |         pub fn value(&self) -> &T {
[INFO] [stdout]    |                ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 71 |         pub fn value_mut(&mut self) -> &mut T {
[INFO] [stdout]    |                ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 74 |         pub fn other(&mut self) -> Self {
[INFO] [stdout]    |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `construct_graph` is never used
[INFO] [stdout]   --> src/test07_nodes_in_arena.rs:79:12
[INFO] [stdout]    |
[INFO] [stdout] 79 |     pub fn construct_graph() -> Graph<usize> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `other` is never used
[INFO] [stdout]   --> src/test07_nodes_in_arena.rs:95:16
[INFO] [stdout]    |
[INFO] [stdout] 94 |     impl<T> Node<T> {
[INFO] [stdout]    |     --------------- method in this implementation
[INFO] [stdout] 95 |         pub fn other(&self) -> &Self {
[INFO] [stdout]    |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `head` and `head_mut` are never used
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:101:16
[INFO] [stdout]     |
[INFO] [stdout] 100 |     impl<T> Graph<T> {
[INFO] [stdout]     |     ---------------- methods in this implementation
[INFO] [stdout] 101 |         pub fn head(&self) -> &Node<T> {
[INFO] [stdout]     |                ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 105 |         pub fn head_mut(&mut self) -> NodeRefMut<T> {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_mut` is never used
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:232:16
[INFO] [stdout]     |
[INFO] [stdout] 215 |     impl<T> Pool<T> {
[INFO] [stdout]     |     --------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 232 |         pub fn get_mut(&mut self, p: Ptr<T>) -> &mut T {
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `is_sentinel` and `value` are never used
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:249:16
[INFO] [stdout]     |
[INFO] [stdout] 248 |     impl<T> Node<T> {
[INFO] [stdout]     |     --------------- methods in this implementation
[INFO] [stdout] 249 |         pub fn is_sentinel(&self) -> bool {
[INFO] [stdout]     |                ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 258 |         pub fn value(&self) -> &T {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NodeMut` is never constructed
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:264:16
[INFO] [stdout]     |
[INFO] [stdout] 264 |     pub struct NodeMut<'a, T>(&'a mut Node<T>);
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `sentinel`, `tail`, `is_empty`, and `push_front` are never used
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:295:16
[INFO] [stdout]     |
[INFO] [stdout] 281 |     impl<T> List<T> {
[INFO] [stdout]     |     --------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 295 |         pub fn sentinel(&self) -> Ptr<Node<T>> {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 301 |         pub fn tail(&self) -> Ref<Node<T>> {
[INFO] [stdout]     |                ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 304 |         pub fn is_empty(&self) -> bool {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 338 |         pub fn push_front(&mut self, value: T) {
[INFO] [stdout]     |                ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test05_nodes_in_hashmap.rs:120:24
[INFO] [stdout]     |
[INFO] [stdout] 120 |         pub fn get_mut(&mut self, ptr: *const Node<T>) -> Option<NodeMut<T>> {
[INFO] [stdout]     |                        ^^^^^^^^^ the lifetime is elided here     ^^^^^^^^^^ the same lifetime is hidden 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] 120 |         pub fn get_mut(&mut self, ptr: *const Node<T>) -> Option<NodeMut<'_, T>> {
[INFO] [stdout]     |                                                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/test06_nodes_in_mepoo.rs:14:21
[INFO] [stdout]    |
[INFO] [stdout] 14 |         pub fn next(&self) -> Ref<Self> {
[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] 14 |         pub fn next(&self) -> Ref<'_, Self> {
[INFO] [stdout]    |                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/test06_nodes_in_mepoo.rs:17:21
[INFO] [stdout]    |
[INFO] [stdout] 17 |         pub fn prev(&self) -> Ref<Self> {
[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] 17 |         pub fn prev(&self) -> Ref<'_, Self> {
[INFO] [stdout]    |                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/test06_nodes_in_mepoo.rs:58:21
[INFO] [stdout]    |
[INFO] [stdout] 58 |         fn sentinel(&self) -> Ref<Node<T>> {
[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] 58 |         fn sentinel(&self) -> Ref<'_, Node<T>> {
[INFO] [stdout]    |                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/test06_nodes_in_mepoo.rs:61:24
[INFO] [stdout]    |
[INFO] [stdout] 61 |         pub fn get_ref(&self, ptr: Ptr<Node<T>>) -> Option<Ref<Node<T>>> {
[INFO] [stdout]    |                        ^^^^^ the lifetime is elided here   ^^^^^^^^^^^^ the same lifetime is hidden 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] 61 |         pub fn get_ref(&self, ptr: Ptr<Node<T>>) -> Option<Ref<'_, Node<T>>> {
[INFO] [stdout]    |                                                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/test06_nodes_in_mepoo.rs:67:24
[INFO] [stdout]    |
[INFO] [stdout] 67 |         pub fn get_mut(&mut self, ptr: Ptr<Node<T>>) -> Option<NodeMut<T>> {
[INFO] [stdout]    |                        ^^^^^^^^^ the lifetime is elided here   ^^^^^^^^^^ the same lifetime is hidden 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] 67 |         pub fn get_mut(&mut self, ptr: Ptr<Node<T>>) -> Option<NodeMut<'_, T>> {
[INFO] [stdout]    |                                                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/test06_nodes_in_mepoo.rs:70:21
[INFO] [stdout]    |
[INFO] [stdout] 70 |         pub fn head(&self) -> Ref<Node<T>> {
[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] 70 |         pub fn head(&self) -> Ref<'_, Node<T>> {
[INFO] [stdout]    |                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/test06_nodes_in_mepoo.rs:73:21
[INFO] [stdout]    |
[INFO] [stdout] 73 |         pub fn tail(&self) -> Ref<Node<T>> {
[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] 73 |         pub fn tail(&self) -> Ref<'_, Node<T>> {
[INFO] [stdout]    |                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test06_nodes_in_mepoo.rs:106:23
[INFO] [stdout]     |
[INFO] [stdout] 106 |         pub fn remove(&mut self, node: Ptr<Node<T>>) -> Option<Ref<Node<T>>> {
[INFO] [stdout]     |                       ^^^^^^^^^ the lifetime is elided here    ^^^^^^^^^^^^ the same lifetime is hidden 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] 106 |         pub fn remove(&mut self, node: Ptr<Node<T>>) -> Option<Ref<'_, Node<T>>> {
[INFO] [stdout]     |                                                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:105:25
[INFO] [stdout]     |
[INFO] [stdout] 105 |         pub fn head_mut(&mut self) -> NodeRefMut<T> {
[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] 105 |         pub fn head_mut(&mut self) -> NodeRefMut<'_, T> {
[INFO] [stdout]     |                                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:228:20
[INFO] [stdout]     |
[INFO] [stdout] 228 |         pub fn get(&self, p: Ptr<T>) -> Ref<T> {
[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] 228 |         pub fn get(&self, p: Ptr<T>) -> Ref<'_, T> {
[INFO] [stdout]     |                                             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:252:21
[INFO] [stdout]     |
[INFO] [stdout] 252 |         pub fn next(&self) -> Ref<Self> {
[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] 252 |         pub fn next(&self) -> Ref<'_, Self> {
[INFO] [stdout]     |                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:255:21
[INFO] [stdout]     |
[INFO] [stdout] 255 |         pub fn prev(&self) -> Ref<Self> {
[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] 255 |         pub fn prev(&self) -> Ref<'_, Self> {
[INFO] [stdout]     |                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:298:21
[INFO] [stdout]     |
[INFO] [stdout] 298 |         pub fn head(&self) -> Ref<Node<T>> {
[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] 298 |         pub fn head(&self) -> Ref<'_, Node<T>> {
[INFO] [stdout]     |                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:301:21
[INFO] [stdout]     |
[INFO] [stdout] 301 |         pub fn tail(&self) -> Ref<Node<T>> {
[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] 301 |         pub fn tail(&self) -> Ref<'_, Node<T>> {
[INFO] [stdout]     |                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:307:20
[INFO] [stdout]     |
[INFO] [stdout] 307 |         pub fn get(&self, p: Ptr<Node<T>>) -> Option<Ref<Node<T>>> {
[INFO] [stdout]     |                    ^^^^^ the lifetime is elided here ^^^^^^^^^^^^ the same lifetime is hidden 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] 307 |         pub fn get(&self, p: Ptr<Node<T>>) -> Option<Ref<'_, Node<T>>> {
[INFO] [stdout]     |                                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:341:23
[INFO] [stdout]     |
[INFO] [stdout] 341 |         pub fn remove(&mut self, node: Ptr<Node<T>>) -> Option<Ref<Node<T>>> {
[INFO] [stdout]     |                       ^^^^^^^^^ the lifetime is elided here    ^^^^^^^^^^^^ the same lifetime is hidden 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] 341 |         pub fn remove(&mut self, node: Ptr<Node<T>>) -> Option<Ref<'_, Node<T>>> {
[INFO] [stdout]     |                                                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.11s
[INFO] running `Command { std: "docker" "inspect" "396b2925aa983b02d45eafb578e3840ced4e4fb7d001f3a6a4679389a93f7d24", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "396b2925aa983b02d45eafb578e3840ced4e4fb7d001f3a6a4679389a93f7d24", kill_on_drop: false }`
[INFO] [stdout] 396b2925aa983b02d45eafb578e3840ced4e4fb7d001f3a6a4679389a93f7d24
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+db823df02fd0c2cf67b43025ac3fef3f2d743245" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 62033d53efd27c84f5b84e79c92e8654ae65449e1c040d2dff719e7c69a5d56d
[INFO] running `Command { std: "docker" "start" "-a" "62033d53efd27c84f5b84e79c92e8654ae65449e1c040d2dff719e7c69a5d56d", kill_on_drop: false }`
[INFO] [stderr]    Compiling graph_in_rust_with_unsafe v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]  --> src/test03_two_nodes_graph.rs:7:13
[INFO] [stdout]   |
[INFO] [stdout] 6 |     struct Node<'a, T> {
[INFO] [stdout]   |            ---- field in this struct
[INFO] [stdout] 7 |         pub value: T,
[INFO] [stdout]   |             ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `value` is never used
[INFO] [stdout]    --> src/test03_two_nodes_graph.rs:102:16
[INFO] [stdout]     |
[INFO] [stdout] 101 |     impl<'a, T> NodeRefMut<'a, T> {
[INFO] [stdout]     |     ----------------------------- method in this implementation
[INFO] [stdout] 102 |         pub fn value(&self) -> &T {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]    --> src/test03_two_nodes_graph.rs:254:13
[INFO] [stdout]     |
[INFO] [stdout] 253 |     pub struct Node<'a, T> {
[INFO] [stdout]     |                ---- field in this struct
[INFO] [stdout] 254 |         pub value: T,
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]  --> src/test07_nodes_in_arena.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 5 |     struct Node<'a, T> {
[INFO] [stdout]   |            ---- field in this struct
[INFO] [stdout] 6 |         pub value: T,
[INFO] [stdout]   |             ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Graph` is never constructed
[INFO] [stdout]   --> src/test07_nodes_in_arena.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 |     struct Graph<'a, T> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `nodes` is never read
[INFO] [stdout]   --> src/test07_nodes_in_arena.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |     pub struct Graph<T> {
[INFO] [stdout]    |                ----- field in this struct
[INFO] [stdout] 62 |         nodes: Arena<Node<T>>,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `value` and `other` are never used
[INFO] [stdout]   --> src/test07_nodes_in_arena.rs:68:16
[INFO] [stdout]    |
[INFO] [stdout] 67 |     impl<'a, T> NodeRefMut<'a, T> {
[INFO] [stdout]    |     ----------------------------- methods in this implementation
[INFO] [stdout] 68 |         pub fn value(&self) -> &T {
[INFO] [stdout]    |                ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 74 |         pub fn other(&mut self) -> Self {
[INFO] [stdout]    |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_mut` is never used
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:232:16
[INFO] [stdout]     |
[INFO] [stdout] 215 |     impl<T> Pool<T> {
[INFO] [stdout]     |     --------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 232 |         pub fn get_mut(&mut self, p: Ptr<T>) -> &mut T {
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NodeMut` is never constructed
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:264:16
[INFO] [stdout]     |
[INFO] [stdout] 264 |     pub struct NodeMut<'a, T>(&'a mut Node<T>);
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test03_two_nodes_graph.rs:138:26
[INFO] [stdout]     |
[INFO] [stdout] 138 |         pub fn node1_mut(&mut self) -> NodeRefMut<T> {
[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] 138 |         pub fn node1_mut(&mut self) -> NodeRefMut<'_, T> {
[INFO] [stdout]     |                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test05_nodes_in_hashmap.rs:120:24
[INFO] [stdout]     |
[INFO] [stdout] 120 |         pub fn get_mut(&mut self, ptr: *const Node<T>) -> Option<NodeMut<T>> {
[INFO] [stdout]     |                        ^^^^^^^^^ the lifetime is elided here     ^^^^^^^^^^ the same lifetime is hidden 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] 120 |         pub fn get_mut(&mut self, ptr: *const Node<T>) -> Option<NodeMut<'_, T>> {
[INFO] [stdout]     |                                                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/test06_nodes_in_mepoo.rs:14:21
[INFO] [stdout]    |
[INFO] [stdout] 14 |         pub fn next(&self) -> Ref<Self> {
[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] 14 |         pub fn next(&self) -> Ref<'_, Self> {
[INFO] [stdout]    |                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/test06_nodes_in_mepoo.rs:17:21
[INFO] [stdout]    |
[INFO] [stdout] 17 |         pub fn prev(&self) -> Ref<Self> {
[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] 17 |         pub fn prev(&self) -> Ref<'_, Self> {
[INFO] [stdout]    |                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/test06_nodes_in_mepoo.rs:58:21
[INFO] [stdout]    |
[INFO] [stdout] 58 |         fn sentinel(&self) -> Ref<Node<T>> {
[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] 58 |         fn sentinel(&self) -> Ref<'_, Node<T>> {
[INFO] [stdout]    |                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/test06_nodes_in_mepoo.rs:61:24
[INFO] [stdout]    |
[INFO] [stdout] 61 |         pub fn get_ref(&self, ptr: Ptr<Node<T>>) -> Option<Ref<Node<T>>> {
[INFO] [stdout]    |                        ^^^^^ the lifetime is elided here   ^^^^^^^^^^^^ the same lifetime is hidden 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] 61 |         pub fn get_ref(&self, ptr: Ptr<Node<T>>) -> Option<Ref<'_, Node<T>>> {
[INFO] [stdout]    |                                                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/test06_nodes_in_mepoo.rs:67:24
[INFO] [stdout]    |
[INFO] [stdout] 67 |         pub fn get_mut(&mut self, ptr: Ptr<Node<T>>) -> Option<NodeMut<T>> {
[INFO] [stdout]    |                        ^^^^^^^^^ the lifetime is elided here   ^^^^^^^^^^ the same lifetime is hidden 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] 67 |         pub fn get_mut(&mut self, ptr: Ptr<Node<T>>) -> Option<NodeMut<'_, T>> {
[INFO] [stdout]    |                                                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/test06_nodes_in_mepoo.rs:70:21
[INFO] [stdout]    |
[INFO] [stdout] 70 |         pub fn head(&self) -> Ref<Node<T>> {
[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] 70 |         pub fn head(&self) -> Ref<'_, Node<T>> {
[INFO] [stdout]    |                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/test06_nodes_in_mepoo.rs:73:21
[INFO] [stdout]    |
[INFO] [stdout] 73 |         pub fn tail(&self) -> Ref<Node<T>> {
[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] 73 |         pub fn tail(&self) -> Ref<'_, Node<T>> {
[INFO] [stdout]    |                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test06_nodes_in_mepoo.rs:106:23
[INFO] [stdout]     |
[INFO] [stdout] 106 |         pub fn remove(&mut self, node: Ptr<Node<T>>) -> Option<Ref<Node<T>>> {
[INFO] [stdout]     |                       ^^^^^^^^^ the lifetime is elided here    ^^^^^^^^^^^^ the same lifetime is hidden 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] 106 |         pub fn remove(&mut self, node: Ptr<Node<T>>) -> Option<Ref<'_, Node<T>>> {
[INFO] [stdout]     |                                                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:105:25
[INFO] [stdout]     |
[INFO] [stdout] 105 |         pub fn head_mut(&mut self) -> NodeRefMut<T> {
[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] 105 |         pub fn head_mut(&mut self) -> NodeRefMut<'_, T> {
[INFO] [stdout]     |                                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:228:20
[INFO] [stdout]     |
[INFO] [stdout] 228 |         pub fn get(&self, p: Ptr<T>) -> Ref<T> {
[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] 228 |         pub fn get(&self, p: Ptr<T>) -> Ref<'_, T> {
[INFO] [stdout]     |                                             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:252:21
[INFO] [stdout]     |
[INFO] [stdout] 252 |         pub fn next(&self) -> Ref<Self> {
[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] 252 |         pub fn next(&self) -> Ref<'_, Self> {
[INFO] [stdout]     |                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:255:21
[INFO] [stdout]     |
[INFO] [stdout] 255 |         pub fn prev(&self) -> Ref<Self> {
[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] 255 |         pub fn prev(&self) -> Ref<'_, Self> {
[INFO] [stdout]     |                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:298:21
[INFO] [stdout]     |
[INFO] [stdout] 298 |         pub fn head(&self) -> Ref<Node<T>> {
[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] 298 |         pub fn head(&self) -> Ref<'_, Node<T>> {
[INFO] [stdout]     |                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:301:21
[INFO] [stdout]     |
[INFO] [stdout] 301 |         pub fn tail(&self) -> Ref<Node<T>> {
[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] 301 |         pub fn tail(&self) -> Ref<'_, Node<T>> {
[INFO] [stdout]     |                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:307:20
[INFO] [stdout]     |
[INFO] [stdout] 307 |         pub fn get(&self, p: Ptr<Node<T>>) -> Option<Ref<Node<T>>> {
[INFO] [stdout]     |                    ^^^^^ the lifetime is elided here ^^^^^^^^^^^^ the same lifetime is hidden 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] 307 |         pub fn get(&self, p: Ptr<Node<T>>) -> Option<Ref<'_, Node<T>>> {
[INFO] [stdout]     |                                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/test07_nodes_in_arena.rs:341:23
[INFO] [stdout]     |
[INFO] [stdout] 341 |         pub fn remove(&mut self, node: Ptr<Node<T>>) -> Option<Ref<Node<T>>> {
[INFO] [stdout]     |                       ^^^^^^^^^ the lifetime is elided here    ^^^^^^^^^^^^ the same lifetime is hidden 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] 341 |         pub fn remove(&mut self, node: Ptr<Node<T>>) -> Option<Ref<'_, Node<T>>> {
[INFO] [stdout]     |                                                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.83s
[INFO] running `Command { std: "docker" "inspect" "62033d53efd27c84f5b84e79c92e8654ae65449e1c040d2dff719e7c69a5d56d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "62033d53efd27c84f5b84e79c92e8654ae65449e1c040d2dff719e7c69a5d56d", kill_on_drop: false }`
[INFO] [stdout] 62033d53efd27c84f5b84e79c92e8654ae65449e1c040d2dff719e7c69a5d56d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+db823df02fd0c2cf67b43025ac3fef3f2d743245" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 4a39c0d010340b9b76f4d6dd6203d8e53934d90d7f3d7bfc74fbfcd58cbc1dca
[INFO] running `Command { std: "docker" "start" "-a" "4a39c0d010340b9b76f4d6dd6203d8e53934d90d7f3d7bfc74fbfcd58cbc1dca", kill_on_drop: false }`
[INFO] [stderr] warning: field `value` is never read
[INFO] [stderr]  --> src/test03_two_nodes_graph.rs:7:13
[INFO] [stderr]   |
[INFO] [stderr] 6 |     struct Node<'a, T> {
[INFO] [stderr]   |            ---- field in this struct
[INFO] [stderr] 7 |         pub value: T,
[INFO] [stderr]   |             ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method `value` is never used
[INFO] [stderr]    --> src/test03_two_nodes_graph.rs:102:16
[INFO] [stderr]     |
[INFO] [stderr] 101 |     impl<'a, T> NodeRefMut<'a, T> {
[INFO] [stderr]     |     ----------------------------- method in this implementation
[INFO] [stderr] 102 |         pub fn value(&self) -> &T {
[INFO] [stderr]     |                ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field `value` is never read
[INFO] [stderr]    --> src/test03_two_nodes_graph.rs:254:13
[INFO] [stderr]     |
[INFO] [stderr] 253 |     pub struct Node<'a, T> {
[INFO] [stderr]     |                ---- field in this struct
[INFO] [stderr] 254 |         pub value: T,
[INFO] [stderr]     |             ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field `value` is never read
[INFO] [stderr]  --> src/test07_nodes_in_arena.rs:6:13
[INFO] [stderr]   |
[INFO] [stderr] 5 |     struct Node<'a, T> {
[INFO] [stderr]   |            ---- field in this struct
[INFO] [stderr] 6 |         pub value: T,
[INFO] [stderr]   |             ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Graph` is never constructed
[INFO] [stderr]   --> src/test07_nodes_in_arena.rs:30:12
[INFO] [stderr]    |
[INFO] [stderr] 30 |     struct Graph<'a, T> {
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field `nodes` is never read
[INFO] [stderr]   --> src/test07_nodes_in_arena.rs:62:9
[INFO] [stderr]    |
[INFO] [stderr] 61 |     pub struct Graph<T> {
[INFO] [stderr]    |                ----- field in this struct
[INFO] [stderr] 62 |         nodes: Arena<Node<T>>,
[INFO] [stderr]    |         ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: methods `value` and `other` are never used
[INFO] [stderr]   --> src/test07_nodes_in_arena.rs:68:16
[INFO] [stderr]    |
[INFO] [stderr] 67 |     impl<'a, T> NodeRefMut<'a, T> {
[INFO] [stderr]    |     ----------------------------- methods in this implementation
[INFO] [stderr] 68 |         pub fn value(&self) -> &T {
[INFO] [stderr]    |                ^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 74 |         pub fn other(&mut self) -> Self {
[INFO] [stderr]    |                ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `get_mut` is never used
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:232:16
[INFO] [stderr]     |
[INFO] [stderr] 215 |     impl<T> Pool<T> {
[INFO] [stderr]     |     --------------- method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 232 |         pub fn get_mut(&mut self, p: Ptr<T>) -> &mut T {
[INFO] [stderr]     |                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `NodeMut` is never constructed
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:264:16
[INFO] [stderr]     |
[INFO] [stderr] 264 |     pub struct NodeMut<'a, T>(&'a mut Node<T>);
[INFO] [stderr]     |                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/test03_two_nodes_graph.rs:138:26
[INFO] [stderr]     |
[INFO] [stderr] 138 |         pub fn node1_mut(&mut self) -> NodeRefMut<T> {
[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] 138 |         pub fn node1_mut(&mut self) -> NodeRefMut<'_, T> {
[INFO] [stderr]     |                                                   +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/test05_nodes_in_hashmap.rs:120:24
[INFO] [stderr]     |
[INFO] [stderr] 120 |         pub fn get_mut(&mut self, ptr: *const Node<T>) -> Option<NodeMut<T>> {
[INFO] [stderr]     |                        ^^^^^^^^^ the lifetime is elided here     ^^^^^^^^^^ the same lifetime is hidden 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] 120 |         pub fn get_mut(&mut self, ptr: *const Node<T>) -> Option<NodeMut<'_, T>> {
[INFO] [stderr]     |                                                                          +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]   --> src/test06_nodes_in_mepoo.rs:14:21
[INFO] [stderr]    |
[INFO] [stderr] 14 |         pub fn next(&self) -> Ref<Self> {
[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] 14 |         pub fn next(&self) -> Ref<'_, Self> {
[INFO] [stderr]    |                                   +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]   --> src/test06_nodes_in_mepoo.rs:17:21
[INFO] [stderr]    |
[INFO] [stderr] 17 |         pub fn prev(&self) -> Ref<Self> {
[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] 17 |         pub fn prev(&self) -> Ref<'_, Self> {
[INFO] [stderr]    |                                   +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]   --> src/test06_nodes_in_mepoo.rs:58:21
[INFO] [stderr]    |
[INFO] [stderr] 58 |         fn sentinel(&self) -> Ref<Node<T>> {
[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] 58 |         fn sentinel(&self) -> Ref<'_, Node<T>> {
[INFO] [stderr]    |                                   +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]   --> src/test06_nodes_in_mepoo.rs:61:24
[INFO] [stderr]    |
[INFO] [stderr] 61 |         pub fn get_ref(&self, ptr: Ptr<Node<T>>) -> Option<Ref<Node<T>>> {
[INFO] [stderr]    |                        ^^^^^ the lifetime is elided here   ^^^^^^^^^^^^ the same lifetime is hidden 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] 61 |         pub fn get_ref(&self, ptr: Ptr<Node<T>>) -> Option<Ref<'_, Node<T>>> {
[INFO] [stderr]    |                                                                +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]   --> src/test06_nodes_in_mepoo.rs:67:24
[INFO] [stderr]    |
[INFO] [stderr] 67 |         pub fn get_mut(&mut self, ptr: Ptr<Node<T>>) -> Option<NodeMut<T>> {
[INFO] [stderr]    |                        ^^^^^^^^^ the lifetime is elided here   ^^^^^^^^^^ the same lifetime is hidden 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] 67 |         pub fn get_mut(&mut self, ptr: Ptr<Node<T>>) -> Option<NodeMut<'_, T>> {
[INFO] [stderr]    |                                                                        +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]   --> src/test06_nodes_in_mepoo.rs:70:21
[INFO] [stderr]    |
[INFO] [stderr] 70 |         pub fn head(&self) -> Ref<Node<T>> {
[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] 70 |         pub fn head(&self) -> Ref<'_, Node<T>> {
[INFO] [stderr]    |                                   +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]   --> src/test06_nodes_in_mepoo.rs:73:21
[INFO] [stderr]    |
[INFO] [stderr] 73 |         pub fn tail(&self) -> Ref<Node<T>> {
[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] 73 |         pub fn tail(&self) -> Ref<'_, Node<T>> {
[INFO] [stderr]    |                                   +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/test06_nodes_in_mepoo.rs:106:23
[INFO] [stderr]     |
[INFO] [stderr] 106 |         pub fn remove(&mut self, node: Ptr<Node<T>>) -> Option<Ref<Node<T>>> {
[INFO] [stderr]     |                       ^^^^^^^^^ the lifetime is elided here    ^^^^^^^^^^^^ the same lifetime is hidden 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] 106 |         pub fn remove(&mut self, node: Ptr<Node<T>>) -> Option<Ref<'_, Node<T>>> {
[INFO] [stderr]     |                                                                    +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:105:25
[INFO] [stderr]     |
[INFO] [stderr] 105 |         pub fn head_mut(&mut self) -> NodeRefMut<T> {
[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] 105 |         pub fn head_mut(&mut self) -> NodeRefMut<'_, T> {
[INFO] [stderr]     |                                                  +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:228:20
[INFO] [stderr]     |
[INFO] [stderr] 228 |         pub fn get(&self, p: Ptr<T>) -> Ref<T> {
[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] 228 |         pub fn get(&self, p: Ptr<T>) -> Ref<'_, T> {
[INFO] [stderr]     |                                             +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:252:21
[INFO] [stderr]     |
[INFO] [stderr] 252 |         pub fn next(&self) -> Ref<Self> {
[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] 252 |         pub fn next(&self) -> Ref<'_, Self> {
[INFO] [stderr]     |                                   +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:255:21
[INFO] [stderr]     |
[INFO] [stderr] 255 |         pub fn prev(&self) -> Ref<Self> {
[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] 255 |         pub fn prev(&self) -> Ref<'_, Self> {
[INFO] [stderr]     |                                   +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:298:21
[INFO] [stderr]     |
[INFO] [stderr] 298 |         pub fn head(&self) -> Ref<Node<T>> {
[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] 298 |         pub fn head(&self) -> Ref<'_, Node<T>> {
[INFO] [stderr]     |                                   +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:301:21
[INFO] [stderr]     |
[INFO] [stderr] 301 |         pub fn tail(&self) -> Ref<Node<T>> {
[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] 301 |         pub fn tail(&self) -> Ref<'_, Node<T>> {
[INFO] [stderr]     |                                   +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:307:20
[INFO] [stderr]     |
[INFO] [stderr] 307 |         pub fn get(&self, p: Ptr<Node<T>>) -> Option<Ref<Node<T>>> {
[INFO] [stderr]     |                    ^^^^^ the lifetime is elided here ^^^^^^^^^^^^ the same lifetime is hidden 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] 307 |         pub fn get(&self, p: Ptr<Node<T>>) -> Option<Ref<'_, Node<T>>> {
[INFO] [stderr]     |                                                          +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:341:23
[INFO] [stderr]     |
[INFO] [stderr] 341 |         pub fn remove(&mut self, node: Ptr<Node<T>>) -> Option<Ref<Node<T>>> {
[INFO] [stderr]     |                       ^^^^^^^^^ the lifetime is elided here    ^^^^^^^^^^^^ the same lifetime is hidden 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] 341 |         pub fn remove(&mut self, node: Ptr<Node<T>>) -> Option<Ref<'_, Node<T>>> {
[INFO] [stderr]     |                                                                    +++
[INFO] [stderr] 
[INFO] [stderr] warning: `graph_in_rust_with_unsafe` (bin "graph_in_rust_with_unsafe" test) generated 27 warnings (run `cargo fix --bin "graph_in_rust_with_unsafe" -p graph_in_rust_with_unsafe --tests` to apply 18 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/graph_in_rust_with_unsafe-4493ade97112cc6b)
[INFO] [stdout] 
[INFO] [stdout] running 17 tests
[INFO] [stdout] test test01_box_and_ptr::test01_0 ... ok
[INFO] [stdout] test test01_box_and_ptr::test01_1 ... ok
[INFO] [stdout] test test01_box_and_ptr::test01_2::test ... ok
[INFO] [stdout] test test01_box_and_ptr::test01_3::test ... ok
[INFO] [stdout] test test02_single_node_graph::test02_1 ... ok
[INFO] [stdout] test test03_two_nodes_graph::graph3::test ... ok
[INFO] [stdout] test test03_two_nodes_graph::not_compilable::test ... ok
[INFO] [stdout] test test03_two_nodes_graph::test03_1 ... ok
[INFO] [stdout] test test03_two_nodes_graph::with_cell::test1 ... ok
[INFO] [stdout] test test03_two_nodes_graph::with_cell::test2 ... ok
[INFO] [stdout] test test04_nodes_in_vec::test ... ok
[INFO] [stdout] test test05_nodes_in_hashmap::test_list ... ok
[INFO] [stdout] test test05_nodes_in_hashmap::test_pool ... ok
[INFO] [stdout] test test07_nodes_in_arena::test_with_pointer ... ok
[INFO] [stdout] test test06_nodes_in_mepoo::test_list ... ok
[INFO] [stdout] test test07_nodes_in_arena::without_pointer::test1 ... ok
[INFO] [stdout] test test07_nodes_in_arena::test_list ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 17 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "4a39c0d010340b9b76f4d6dd6203d8e53934d90d7f3d7bfc74fbfcd58cbc1dca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4a39c0d010340b9b76f4d6dd6203d8e53934d90d7f3d7bfc74fbfcd58cbc1dca", kill_on_drop: false }`
[INFO] [stdout] 4a39c0d010340b9b76f4d6dd6203d8e53934d90d7f3d7bfc74fbfcd58cbc1dca
