[INFO] cloning repository https://github.com/balits/dsa_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/balits/dsa_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbalits%2Fdsa_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbalits%2Fdsa_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] bf1a60f0a7c7b914ac1cc0e1c885202fcb9e4358
[INFO] building balits/dsa_rust against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbalits%2Fdsa_rust" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/balits/dsa_rust on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/balits/dsa_rust
[INFO] finished tweaking git repo https://github.com/balits/dsa_rust
[INFO] tweaked toml for git repo https://github.com/balits/dsa_rust written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/balits/dsa_rust 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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ee27d6ccb7377f69f36132a10b612deb9abae02b7a864d3184876733140c1750
[INFO] running `Command { std: "docker" "start" "-a" "ee27d6ccb7377f69f36132a10b612deb9abae02b7a864d3184876733140c1750", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ee27d6ccb7377f69f36132a10b612deb9abae02b7a864d3184876733140c1750", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ee27d6ccb7377f69f36132a10b612deb9abae02b7a864d3184876733140c1750", kill_on_drop: false }`
[INFO] [stdout] ee27d6ccb7377f69f36132a10b612deb9abae02b7a864d3184876733140c1750
[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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2987a32987a6e2dc5785c00ddb20a22a768248511f9673f2a57b9af923591944
[INFO] running `Command { std: "docker" "start" "-a" "2987a32987a6e2dc5785c00ddb20a22a768248511f9673f2a57b9af923591944", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]    Compiling getrandom v0.2.12
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling datastructures_and_algorithms v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `super::HashMap`
[INFO] [stdout]    --> src/datastructures/hashmap/hashmap.rs:152:9
[INFO] [stdout]     |
[INFO] [stdout] 152 |     use super::HashMap;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `iter::*`
[INFO] [stdout]  --> src/datastructures/hashmap/mod.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub use iter::*;
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `hashmap::*`
[INFO] [stdout]  --> src/datastructures/mod.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub use hashmap::*;
[INFO] [stdout]   |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `vector::Vector`
[INFO] [stdout]  --> src/datastructures/mod.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub use vector::Vector;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `merge_sort::merge_sort`
[INFO] [stdout]  --> src/sorting/mod.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub use merge_sort::merge_sort;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `quicksort::quicksort`
[INFO] [stdout]  --> src/sorting/mod.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub use quicksort::quicksort;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Write` and `self`
[INFO] [stdout]  --> src/string/pangram.rs:2:15
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{self, Write};
[INFO] [stdout]   |               ^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `pangram::*`
[INFO] [stdout]  --> src/string/mod.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub use pangram::*;
[INFO] [stdout]   |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `char`
[INFO] [stdout]   --> src/string/pangram.rs:47:10
[INFO] [stdout]    |
[INFO] [stdout] 47 |     for (char, times) in map {
[INFO] [stdout]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_char`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `panic_cap_overflow` is never used
[INFO] [stdout]  --> src/datastructures/vector.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn panic_cap_overflow() -> ! {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `quicksort` is never used
[INFO] [stdout]  --> src/sorting/quicksort.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn quicksort<T: PartialOrd>(slice: &mut [T]) {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lomuto_partition` is never used
[INFO] [stdout]   --> src/sorting/quicksort.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn lomuto_partition<T: PartialOrd>(slice: &mut [T]) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Perfect`, `Good`, and `Bad` are never constructed
[INFO] [stdout]   --> src/string/pangram.rs:8:5
[INFO] [stdout]    |
[INFO] [stdout] 6  | pub enum PangramKind {
[INFO] [stdout]    |          ----------- variants in this enum
[INFO] [stdout] 7  |     /// Uses each letter in the aphabet exactely once
[INFO] [stdout] 8  |     Perfect,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 9  |     /// Uses each letter in the aphabet,
[INFO] [stdout] 10 |     Good,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 11 |     /// Doest not contain every letter in the alphabet
[INFO] [stdout] 12 |     Bad,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PangramKind` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_pangram` is never used
[INFO] [stdout]   --> src/string/pangram.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn is_pangram(input_str: &str) -> PangramKind {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.15s
[INFO] running `Command { std: "docker" "inspect" "2987a32987a6e2dc5785c00ddb20a22a768248511f9673f2a57b9af923591944", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2987a32987a6e2dc5785c00ddb20a22a768248511f9673f2a57b9af923591944", kill_on_drop: false }`
[INFO] [stdout] 2987a32987a6e2dc5785c00ddb20a22a768248511f9673f2a57b9af923591944
[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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 45f767edbc00793a62a97a3ca73cf8b48c5b960a8bcbafd17c71b71c1338be7d
[INFO] running `Command { std: "docker" "start" "-a" "45f767edbc00793a62a97a3ca73cf8b48c5b960a8bcbafd17c71b71c1338be7d", kill_on_drop: false }`
[INFO] [stdout] warning: unused import: `super::HashMap`
[INFO] [stdout]    --> src/datastructures/hashmap/hashmap.rs:152:9
[INFO] [stdout]     |
[INFO] [stdout] 152 |     use super::HashMap;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `iter::*`
[INFO] [stdout]  --> src/datastructures/hashmap/mod.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub use iter::*;
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `hashmap::*`
[INFO] [stdout]  --> src/datastructures/mod.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub use hashmap::*;
[INFO] [stdout]   |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `vector::Vector`
[INFO] [stdout]  --> src/datastructures/mod.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub use vector::Vector;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `merge_sort::merge_sort`
[INFO] [stdout]  --> src/sorting/mod.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub use merge_sort::merge_sort;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `quicksort::quicksort`
[INFO] [stdout]  --> src/sorting/mod.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub use quicksort::quicksort;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Write` and `self`
[INFO] [stdout]  --> src/string/pangram.rs:2:15
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{self, Write};
[INFO] [stdout]   |               ^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `pangram::*`
[INFO] [stdout]  --> src/string/mod.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub use pangram::*;
[INFO] [stdout]   |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `char`
[INFO] [stdout]   --> src/string/pangram.rs:47:10
[INFO] [stdout]    |
[INFO] [stdout] 47 |     for (char, times) in map {
[INFO] [stdout]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_char`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `panic_cap_overflow` is never used
[INFO] [stdout]  --> src/datastructures/vector.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn panic_cap_overflow() -> ! {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `quicksort` is never used
[INFO] [stdout]  --> src/sorting/quicksort.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn quicksort<T: PartialOrd>(slice: &mut [T]) {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lomuto_partition` is never used
[INFO] [stdout]   --> src/sorting/quicksort.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn lomuto_partition<T: PartialOrd>(slice: &mut [T]) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Perfect`, `Good`, and `Bad` are never constructed
[INFO] [stdout]   --> src/string/pangram.rs:8:5
[INFO] [stdout]    |
[INFO] [stdout] 6  | pub enum PangramKind {
[INFO] [stdout]    |          ----------- variants in this enum
[INFO] [stdout] 7  |     /// Uses each letter in the aphabet exactely once
[INFO] [stdout] 8  |     Perfect,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 9  |     /// Uses each letter in the aphabet,
[INFO] [stdout] 10 |     Good,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 11 |     /// Doest not contain every letter in the alphabet
[INFO] [stdout] 12 |     Bad,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PangramKind` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_pangram` is never used
[INFO] [stdout]   --> src/string/pangram.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn is_pangram(input_str: &str) -> PangramKind {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling datastructures_and_algorithms v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `iter::*`
[INFO] [stdout]  --> src/datastructures/hashmap/mod.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub use iter::*;
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `hashmap::*`
[INFO] [stdout]  --> src/datastructures/mod.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub use hashmap::*;
[INFO] [stdout]   |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `vector::Vector`
[INFO] [stdout]  --> src/datastructures/mod.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub use vector::Vector;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `merge_sort::merge_sort`
[INFO] [stdout]  --> src/sorting/mod.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub use merge_sort::merge_sort;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `quicksort::quicksort`
[INFO] [stdout]  --> src/sorting/mod.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub use quicksort::quicksort;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Write` and `self`
[INFO] [stdout]  --> src/string/pangram.rs:2:15
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{self, Write};
[INFO] [stdout]   |               ^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `pangram::*`
[INFO] [stdout]  --> src/string/mod.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub use pangram::*;
[INFO] [stdout]   |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]    --> src/datastructures/hashmap/iter.rs:214:56
[INFO] [stdout]     |
[INFO] [stdout] 214 |         let keys_only: Vec<u8> = BOOKS.iter().map(|(k, v)| *k).collect();
[INFO] [stdout]     |                                                        ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `char`
[INFO] [stdout]   --> src/string/pangram.rs:47:10
[INFO] [stdout]    |
[INFO] [stdout] 47 |     for (char, times) in map {
[INFO] [stdout]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_char`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `panic_cap_overflow` is never used
[INFO] [stdout]  --> src/datastructures/vector.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn panic_cap_overflow() -> ! {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.47s
[INFO] running `Command { std: "docker" "inspect" "45f767edbc00793a62a97a3ca73cf8b48c5b960a8bcbafd17c71b71c1338be7d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "45f767edbc00793a62a97a3ca73cf8b48c5b960a8bcbafd17c71b71c1338be7d", kill_on_drop: false }`
[INFO] [stdout] 45f767edbc00793a62a97a3ca73cf8b48c5b960a8bcbafd17c71b71c1338be7d