[INFO] cloning repository https://github.com/mmmpa/learning_rust_data_structure [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mmmpa/learning_rust_data_structure" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmmmpa%2Flearning_rust_data_structure", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmmmpa%2Flearning_rust_data_structure'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 255d021cb8214c82ca6d6002070da8d59b5c87a3 [INFO] testing mmmpa/learning_rust_data_structure against 1.59.0 for beta-1.60-1 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmmmpa%2Flearning_rust_data_structure" "/workspace/builds/worker-20/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-20/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/mmmpa/learning_rust_data_structure on toolchain 1.59.0 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/mmmpa/learning_rust_data_structure [INFO] finished tweaking git repo https://github.com/mmmpa/learning_rust_data_structure [INFO] tweaked toml for git repo https://github.com/mmmpa/learning_rust_data_structure written to /workspace/builds/worker-20/source/Cargo.toml [INFO] crate git repo https://github.com/mmmpa/learning_rust_data_structure already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] aea075df3f109d1c2c41c83f98d0487c23cca0b2e209768f5aed29e1a3b98155 [INFO] running `Command { std: "docker" "start" "-a" "aea075df3f109d1c2c41c83f98d0487c23cca0b2e209768f5aed29e1a3b98155", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "aea075df3f109d1c2c41c83f98d0487c23cca0b2e209768f5aed29e1a3b98155", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "aea075df3f109d1c2c41c83f98d0487c23cca0b2e209768f5aed29e1a3b98155", kill_on_drop: false }` [INFO] [stdout] aea075df3f109d1c2c41c83f98d0487c23cca0b2e209768f5aed29e1a3b98155 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] c757b733d320ad530b751a8fdf7416bb38e8e7ccf03c6d9647cecc7cddbb8221 [INFO] running `Command { std: "docker" "start" "-a" "c757b733d320ad530b751a8fdf7416bb38e8e7ccf03c6d9647cecc7cddbb8221", kill_on_drop: false }` [INFO] [stderr] Compiling trees v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused import: `core::borrow::BorrowMut` [INFO] [stdout] --> src/main.rs:1:5 [INFO] [stdout] | [INFO] [stdout] 1 | use core::borrow::BorrowMut; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `core::borrow::BorrowMut` [INFO] [stdout] --> src/binary_search_tree.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | use core::borrow::BorrowMut; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `core::borrow::BorrowMut` [INFO] [stdout] --> src/parental_binary_search_tree.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | use core::borrow::BorrowMut; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/binary_search_tree.rs:62:18 [INFO] [stdout] | [INFO] [stdout] 62 | Some(mut node) => { [INFO] [stdout] | ----^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/parental_binary_search_tree.rs:63:18 [INFO] [stdout] | [INFO] [stdout] 63 | Some(mut node) => { [INFO] [stdout] | ----^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: type alias is never used: `Traced` [INFO] [stdout] --> src/binary_search_tree.rs:7:1 [INFO] [stdout] | [INFO] [stdout] 7 | type Traced = Rc>>; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `root` [INFO] [stdout] --> src/binary_search_tree.rs:11:5 [INFO] [stdout] | [INFO] [stdout] 11 | root: Node, [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `length` [INFO] [stdout] --> src/binary_search_tree.rs:12:5 [INFO] [stdout] | [INFO] [stdout] 12 | length: u32, [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `new` [INFO] [stdout] --> src/binary_search_tree.rs:22:8 [INFO] [stdout] | [INFO] [stdout] 22 | fn new(value: T) -> Node { [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `new` [INFO] [stdout] --> src/binary_search_tree.rs:46:12 [INFO] [stdout] | [INFO] [stdout] 46 | pub fn new() -> Self { [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `insert` [INFO] [stdout] --> src/binary_search_tree.rs:53:12 [INFO] [stdout] | [INFO] [stdout] 53 | pub fn insert(&mut self, v: T) { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `insert_support` [INFO] [stdout] --> src/binary_search_tree.rs:59:8 [INFO] [stdout] | [INFO] [stdout] 59 | fn insert_support(&mut self, root: Node, v: T) -> Node { [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `trace` [INFO] [stdout] --> src/binary_search_tree.rs:76:8 [INFO] [stdout] | [INFO] [stdout] 76 | fn trace(&self) -> Vec> { [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `trace_support` [INFO] [stdout] --> src/binary_search_tree.rs:82:8 [INFO] [stdout] | [INFO] [stdout] 82 | fn trace_support(&self, root: &Node, result: &mut Vec>) { [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: type alias is never used: `Traced` [INFO] [stdout] --> src/parental_binary_search_tree.rs:7:1 [INFO] [stdout] | [INFO] [stdout] 7 | type Traced = Rc>>; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `root` [INFO] [stdout] --> src/parental_binary_search_tree.rs:11:5 [INFO] [stdout] | [INFO] [stdout] 11 | root: Node, [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `length` [INFO] [stdout] --> src/parental_binary_search_tree.rs:12:5 [INFO] [stdout] | [INFO] [stdout] 12 | length: u32, [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `parent` [INFO] [stdout] --> src/parental_binary_search_tree.rs:17:5 [INFO] [stdout] | [INFO] [stdout] 17 | parent: Node, [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `new` [INFO] [stdout] --> src/parental_binary_search_tree.rs:23:8 [INFO] [stdout] | [INFO] [stdout] 23 | fn new(value: T, parent: Node) -> Node { [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `new` [INFO] [stdout] --> src/parental_binary_search_tree.rs:47:12 [INFO] [stdout] | [INFO] [stdout] 47 | pub fn new() -> Self { [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `insert` [INFO] [stdout] --> src/parental_binary_search_tree.rs:54:12 [INFO] [stdout] | [INFO] [stdout] 54 | pub fn insert(&mut self, v: T) { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `insert_support` [INFO] [stdout] --> src/parental_binary_search_tree.rs:60:8 [INFO] [stdout] | [INFO] [stdout] 60 | fn insert_support(&mut self, root: Node, v: T, p: Node) -> Node { [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `trace` [INFO] [stdout] --> src/parental_binary_search_tree.rs:78:8 [INFO] [stdout] | [INFO] [stdout] 78 | fn trace(&self) -> Vec> { [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `trace_support` [INFO] [stdout] --> src/parental_binary_search_tree.rs:84:8 [INFO] [stdout] | [INFO] [stdout] 84 | fn trace_support(&self, root: &Node, result: &mut Vec>) { [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `boxer` [INFO] [stdout] --> src/main.rs:13:5 [INFO] [stdout] | [INFO] [stdout] 13 | boxer: Box, [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `rcer` [INFO] [stdout] --> src/main.rs:18:5 [INFO] [stdout] | [INFO] [stdout] 18 | rcer: Rc, [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `value` [INFO] [stdout] --> src/main.rs:23:5 [INFO] [stdout] | [INFO] [stdout] 23 | value: Option, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 27 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 0.96s [INFO] running `Command { std: "docker" "inspect" "c757b733d320ad530b751a8fdf7416bb38e8e7ccf03c6d9647cecc7cddbb8221", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "c757b733d320ad530b751a8fdf7416bb38e8e7ccf03c6d9647cecc7cddbb8221", kill_on_drop: false }` [INFO] [stdout] c757b733d320ad530b751a8fdf7416bb38e8e7ccf03c6d9647cecc7cddbb8221 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 70a22d858049760d64396c60627ad810368a3417212555926724f0d3e017107a [INFO] running `Command { std: "docker" "start" "-a" "70a22d858049760d64396c60627ad810368a3417212555926724f0d3e017107a", kill_on_drop: false }` [INFO] [stderr] Compiling trees v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused import: `core::borrow::BorrowMut` [INFO] [stdout] --> src/main.rs:1:5 [INFO] [stdout] | [INFO] [stdout] 1 | use core::borrow::BorrowMut; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `core::borrow::BorrowMut` [INFO] [stdout] --> src/binary_search_tree.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | use core::borrow::BorrowMut; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `core::borrow::BorrowMut` [INFO] [stdout] --> src/parental_binary_search_tree.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | use core::borrow::BorrowMut; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/binary_search_tree.rs:62:18 [INFO] [stdout] | [INFO] [stdout] 62 | Some(mut node) => { [INFO] [stdout] | ----^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/parental_binary_search_tree.rs:63:18 [INFO] [stdout] | [INFO] [stdout] 63 | Some(mut node) => { [INFO] [stdout] | ----^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:40:9 [INFO] [stdout] | [INFO] [stdout] 40 | let mut raw_box = Rc::new(Test { value: None }); [INFO] [stdout] | ----^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `parent` [INFO] [stdout] --> src/parental_binary_search_tree.rs:17:5 [INFO] [stdout] | [INFO] [stdout] 17 | parent: Node, [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `rcer` [INFO] [stdout] --> src/main.rs:18:5 [INFO] [stdout] | [INFO] [stdout] 18 | rcer: Rc, [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 8 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.40s [INFO] running `Command { std: "docker" "inspect" "70a22d858049760d64396c60627ad810368a3417212555926724f0d3e017107a", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "70a22d858049760d64396c60627ad810368a3417212555926724f0d3e017107a", kill_on_drop: false }` [INFO] [stdout] 70a22d858049760d64396c60627ad810368a3417212555926724f0d3e017107a [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] e3870a31f6cfe6068e7cb5c5cbdfa2226af31717be84642c33c77d2f51351f59 [INFO] running `Command { std: "docker" "start" "-a" "e3870a31f6cfe6068e7cb5c5cbdfa2226af31717be84642c33c77d2f51351f59", kill_on_drop: false }` [INFO] [stderr] warning: unused import: `core::borrow::BorrowMut` [INFO] [stderr] --> src/main.rs:1:5 [INFO] [stderr] | [INFO] [stderr] 1 | use core::borrow::BorrowMut; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_imports)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused import: `core::borrow::BorrowMut` [INFO] [stderr] --> src/binary_search_tree.rs:4:5 [INFO] [stderr] | [INFO] [stderr] 4 | use core::borrow::BorrowMut; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused import: `core::borrow::BorrowMut` [INFO] [stderr] --> src/parental_binary_search_tree.rs:4:5 [INFO] [stderr] | [INFO] [stderr] 4 | use core::borrow::BorrowMut; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/binary_search_tree.rs:62:18 [INFO] [stderr] | [INFO] [stderr] 62 | Some(mut node) => { [INFO] [stderr] | ----^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_mut)]` on by default [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/parental_binary_search_tree.rs:63:18 [INFO] [stderr] | [INFO] [stderr] 63 | Some(mut node) => { [INFO] [stderr] | ----^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/main.rs:40:9 [INFO] [stderr] | [INFO] [stderr] 40 | let mut raw_box = Rc::new(Test { value: None }); [INFO] [stderr] | ----^^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: field is never read: `parent` [INFO] [stderr] --> src/parental_binary_search_tree.rs:17:5 [INFO] [stderr] | [INFO] [stderr] 17 | parent: Node, [INFO] [stderr] | ^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: field is never read: `rcer` [INFO] [stderr] --> src/main.rs:18:5 [INFO] [stderr] | [INFO] [stderr] 18 | rcer: Rc, [INFO] [stderr] | ^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: `trees` (bin "trees" test) generated 8 warnings [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.00s [INFO] [stdout] [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/trees-6541fcf8d2c2925e) [INFO] [stdout] running 4 tests [INFO] [stdout] test binary_search_tree::test_insert ... ok [INFO] [stdout] test test_rc ... ok [INFO] [stdout] test test_box ... ok [INFO] [stdout] test parental_binary_search_tree::test_insert ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s [INFO] [stdout] [INFO] running `Command { std: "docker" "inspect" "e3870a31f6cfe6068e7cb5c5cbdfa2226af31717be84642c33c77d2f51351f59", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "e3870a31f6cfe6068e7cb5c5cbdfa2226af31717be84642c33c77d2f51351f59", kill_on_drop: false }` [INFO] [stdout] e3870a31f6cfe6068e7cb5c5cbdfa2226af31717be84642c33c77d2f51351f59