[INFO] fetching crate dgunther2001-linked_list 1.0.8...
[INFO] testing dgunther2001-linked_list-1.0.8 against master#c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38 for pr-146098-7
[INFO] extracting crate dgunther2001-linked_list 1.0.8 into /workspace/builds/worker-3-tc1/source
[INFO] started tweaking crates.io crate dgunther2001-linked_list 1.0.8
[INFO] finished tweaking crates.io crate dgunther2001-linked_list 1.0.8
[INFO] tweaked toml for crates.io crate dgunther2001-linked_list 1.0.8 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate dgunther2001-linked_list 1.0.8 on toolchain c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "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" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 38b1662585701bffe9680850995980cea3b4be23a2083fb42a6a6530e4cda3f9
[INFO] running `Command { std: "docker" "start" "-a" "38b1662585701bffe9680850995980cea3b4be23a2083fb42a6a6530e4cda3f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "38b1662585701bffe9680850995980cea3b4be23a2083fb42a6a6530e4cda3f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "38b1662585701bffe9680850995980cea3b4be23a2083fb42a6a6530e4cda3f9", kill_on_drop: false }`
[INFO] [stdout] 38b1662585701bffe9680850995980cea3b4be23a2083fb42a6a6530e4cda3f9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 34698f09d3f5513c5caeab97520b3a46dac00b1fa0db7815b17292bd7348ff85
[INFO] running `Command { std: "docker" "start" "-a" "34698f09d3f5513c5caeab97520b3a46dac00b1fa0db7815b17292bd7348ff85", kill_on_drop: false }`
[INFO] [stderr]    Compiling dgunther2001-linked_list v1.0.8 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `crate::linked_list::LinkedList`
[INFO] [stdout]  --> src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::linked_list::LinkedList;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> src/linked_list.rs:89:18
[INFO] [stdout]    |
[INFO] [stdout] 89 |             Some(n) => {
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/linked_list.rs:221:33
[INFO] [stdout]     |
[INFO] [stdout] 221 | ...   self.head.as_mut().map(|mut n| &mut n.el) // if the mutable reference to self.head is None, return None, otherwise return a m...
[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: methods `next` and `iter` are never used
[INFO] [stdout]   --> src/linked_list.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | / impl <T> ListNode<T> 
[INFO] [stdout] 22 | | where T: Debug {
[INFO] [stdout]    | |______________- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 29 |       fn next(&self) -> &Link<T> { // implementation of a next function
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |       fn iter(&self) {
[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 `get_head_ref` is never used
[INFO] [stdout]    --> src/linked_list.rs:229:8
[INFO] [stdout]     |
[INFO] [stdout]  46 | / impl <T> LinkedList<T> 
[INFO] [stdout]  47 | | where T: Debug + Clone {
[INFO] [stdout]     | |______________________- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 229 |       fn get_head_ref(&self) -> Option<&ListNode<T>> {
[INFO] [stdout]     |          ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/linked_list.rs:388:17
[INFO] [stdout]     |
[INFO] [stdout] 388 |                 write!(f, "{} ", n.el);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 388 |                 let _ = write!(f, "{} ", n.el);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.18s
[INFO] running `Command { std: "docker" "inspect" "34698f09d3f5513c5caeab97520b3a46dac00b1fa0db7815b17292bd7348ff85", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "34698f09d3f5513c5caeab97520b3a46dac00b1fa0db7815b17292bd7348ff85", kill_on_drop: false }`
[INFO] [stdout] 34698f09d3f5513c5caeab97520b3a46dac00b1fa0db7815b17292bd7348ff85
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7fa3646ab6d34a442baab16bfcd3b8ad7c6202a41956bfb38735fd0fe06049be
[INFO] running `Command { std: "docker" "start" "-a" "7fa3646ab6d34a442baab16bfcd3b8ad7c6202a41956bfb38735fd0fe06049be", kill_on_drop: false }`
[INFO] [stdout] warning: unused import: `crate::linked_list::LinkedList`
[INFO] [stdout]  --> src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::linked_list::LinkedList;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> src/linked_list.rs:89:18
[INFO] [stdout]    |
[INFO] [stdout] 89 |             Some(n) => {
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/linked_list.rs:221:33
[INFO] [stdout]     |
[INFO] [stdout] 221 | ...   self.head.as_mut().map(|mut n| &mut n.el) // if the mutable reference to self.head is None, return None, otherwise return a m...
[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] [stderr]    Compiling dgunther2001-linked_list v1.0.8 (/opt/rustwide/workdir)
[INFO] [stdout] warning: methods `next` and `iter` are never used
[INFO] [stdout]   --> src/linked_list.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | / impl <T> ListNode<T> 
[INFO] [stdout] 22 | | where T: Debug {
[INFO] [stdout]    | |______________- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 29 |       fn next(&self) -> &Link<T> { // implementation of a next function
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |       fn iter(&self) {
[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 `get_head_ref` is never used
[INFO] [stdout]    --> src/linked_list.rs:229:8
[INFO] [stdout]     |
[INFO] [stdout]  46 | / impl <T> LinkedList<T> 
[INFO] [stdout]  47 | | where T: Debug + Clone {
[INFO] [stdout]     | |______________________- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 229 |       fn get_head_ref(&self) -> Option<&ListNode<T>> {
[INFO] [stdout]     |          ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/linked_list.rs:388:17
[INFO] [stdout]     |
[INFO] [stdout] 388 |                 write!(f, "{} ", n.el);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 388 |                 let _ = write!(f, "{} ", n.el);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> src/linked_list.rs:89:18
[INFO] [stdout]    |
[INFO] [stdout] 89 |             Some(n) => {
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/linked_list.rs:221:33
[INFO] [stdout]     |
[INFO] [stdout] 221 | ...   self.head.as_mut().map(|mut n| &mut n.el) // if the mutable reference to self.head is None, return None, otherwise return a m...
[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: methods `next` and `iter` are never used
[INFO] [stdout]   --> src/linked_list.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | / impl <T> ListNode<T> 
[INFO] [stdout] 22 | | where T: Debug {
[INFO] [stdout]    | |______________- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 29 |       fn next(&self) -> &Link<T> { // implementation of a next function
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |       fn iter(&self) {
[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 `get_head_ref` is never used
[INFO] [stdout]    --> src/linked_list.rs:229:8
[INFO] [stdout]     |
[INFO] [stdout]  46 | / impl <T> LinkedList<T> 
[INFO] [stdout]  47 | | where T: Debug + Clone {
[INFO] [stdout]     | |______________________- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 229 |       fn get_head_ref(&self) -> Option<&ListNode<T>> {
[INFO] [stdout]     |          ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/linked_list.rs:388:17
[INFO] [stdout]     |
[INFO] [stdout] 388 |                 write!(f, "{} ", n.el);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 388 |                 let _ = write!(f, "{} ", n.el);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.42s
[INFO] running `Command { std: "docker" "inspect" "7fa3646ab6d34a442baab16bfcd3b8ad7c6202a41956bfb38735fd0fe06049be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7fa3646ab6d34a442baab16bfcd3b8ad7c6202a41956bfb38735fd0fe06049be", kill_on_drop: false }`
[INFO] [stdout] 7fa3646ab6d34a442baab16bfcd3b8ad7c6202a41956bfb38735fd0fe06049be
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 17ebd8458725d0821c09431f77d2c87e1473a9355f27f87b07a0c4fe2e2fdc2f
[INFO] running `Command { std: "docker" "start" "-a" "17ebd8458725d0821c09431f77d2c87e1473a9355f27f87b07a0c4fe2e2fdc2f", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `crate::linked_list::LinkedList`
[INFO] [stderr]  --> src/lib.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use crate::linked_list::LinkedList;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]   --> src/linked_list.rs:89:18
[INFO] [stderr]    |
[INFO] [stderr] 89 |             Some(n) => {
[INFO] [stderr]    |                  ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/linked_list.rs:221:33
[INFO] [stderr]     |
[INFO] [stderr] 221 | ...   self.head.as_mut().map(|mut n| &mut n.el) // if the mutable reference to self.head is None, return None, otherwise return a m...
[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: methods `next` and `iter` are never used
[INFO] [stderr]   --> src/linked_list.rs:29:8
[INFO] [stderr]    |
[INFO] [stderr] 21 | / impl <T> ListNode<T> 
[INFO] [stderr] 22 | | where T: Debug {
[INFO] [stderr]    | |______________- methods in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 29 |       fn next(&self) -> &Link<T> { // implementation of a next function
[INFO] [stderr]    |          ^^^^
[INFO] [stderr] ...
[INFO] [stderr] 33 |       fn iter(&self) {
[INFO] [stderr]    |          ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method `get_head_ref` is never used
[INFO] [stderr]    --> src/linked_list.rs:229:8
[INFO] [stderr]     |
[INFO] [stderr]  46 | / impl <T> LinkedList<T> 
[INFO] [stderr]  47 | | where T: Debug + Clone {
[INFO] [stderr]     | |______________________- method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 229 |       fn get_head_ref(&self) -> Option<&ListNode<T>> {
[INFO] [stderr]     |          ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/linked_list.rs:388:17
[INFO] [stderr]     |
[INFO] [stderr] 388 |                 write!(f, "{} ", n.el);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 388 |                 let _ = write!(f, "{} ", n.el);
[INFO] [stderr]     |                 +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `dgunther2001-linked_list` (lib) generated 6 warnings (run `cargo fix --lib -p dgunther2001-linked_list` to apply 3 suggestions)
[INFO] [stderr] warning: `dgunther2001-linked_list` (lib test) generated 5 warnings (5 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/dgunther2001_linked_list-6d0623e3d4fe30c8)
[INFO] [stdout] 
[INFO] [stdout] running 18 tests
[INFO] [stdout] test tests::test_append_back ... ok
[INFO] [stdout] test tests::test_append_front ... ok
[INFO] [stdout] test tests::test_contains ... ok
[INFO] [stdout] test tests::test_delete_back ... ok
[INFO] [stdout] test tests::test_delete_front ... ok
[INFO] [stdout] test tests::test_find ... ok
[INFO] [stdout] test tests::test_get_at_index ... ok
[INFO] [stdout] test tests::test_get_head ... ok
[INFO] [stdout] test tests::test_get_head_as_mut ... ok
[INFO] [stdout] test tests::test_get_tail_ref_mut ... ok
[INFO] [stdout] test tests::test_get_length ... ok
[INFO] [stdout] test tests::test_get_mutable_ref_at_index ... ok
[INFO] [stdout] test tests::test_insert_at_index ... ok
[INFO] [stdout] test tests::test_is_empty ... ok
[INFO] [stdout] test tests::test_clear ... ok
[INFO] [stdout] test tests::test_init_list ... ok
[INFO] [stdout] test tests::test_delete_at_index ... ok
[INFO] [stdout] test tests::test_get_tail_ref ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 18 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.04s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests dgunther2001_linked_list
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "17ebd8458725d0821c09431f77d2c87e1473a9355f27f87b07a0c4fe2e2fdc2f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17ebd8458725d0821c09431f77d2c87e1473a9355f27f87b07a0c4fe2e2fdc2f", kill_on_drop: false }`
[INFO] [stdout] 17ebd8458725d0821c09431f77d2c87e1473a9355f27f87b07a0c4fe2e2fdc2f
