[INFO] cloning repository https://github.com/Mec-iS/rust-algos-illuminated
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Mec-iS/rust-algos-illuminated" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMec-iS%2Frust-algos-illuminated", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMec-iS%2Frust-algos-illuminated'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e9b7e2a77cfe1d878f4b30043b1e25a1561476db
[INFO] checking Mec-iS/rust-algos-illuminated against master#5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMec-iS%2Frust-algos-illuminated" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Mec-iS/rust-algos-illuminated on toolchain 5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Mec-iS/rust-algos-illuminated
[INFO] finished tweaking git repo https://github.com/Mec-iS/rust-algos-illuminated
[INFO] tweaked toml for git repo https://github.com/Mec-iS/rust-algos-illuminated written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/Mec-iS/rust-algos-illuminated already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f312ad9b8877f34b320313b5a9bcba541448215669744e3ba18b5fef4f85bd73
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "f312ad9b8877f34b320313b5a9bcba541448215669744e3ba18b5fef4f85bd73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f312ad9b8877f34b320313b5a9bcba541448215669744e3ba18b5fef4f85bd73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f312ad9b8877f34b320313b5a9bcba541448215669744e3ba18b5fef4f85bd73", kill_on_drop: false }`
[INFO] [stdout] f312ad9b8877f34b320313b5a9bcba541448215669744e3ba18b5fef4f85bd73
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2db6b0bc75767ca42e6465053cdead1759f8b7ecde45aef793584d77dc613076
[INFO] running `Command { std: "docker" "start" "-a" "2db6b0bc75767ca42e6465053cdead1759f8b7ecde45aef793584d77dc613076", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-algos-illuminated v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct is never constructed: `Queue`
[INFO] [stdout]  --> src/other/mod.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Queue {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push`
[INFO] [stdout]   --> src/other/mod.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn push(&mut self, element: char) -> () {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop_raw`
[INFO] [stdout]   --> src/other/mod.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub fn pop_raw(&mut self) -> Option<char> {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop_swap`
[INFO] [stdout]   --> src/other/mod.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn pop_swap(&mut self) -> Option<char> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `split`
[INFO] [stdout]   --> src/other/mod.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 55 |     pub fn split(self) -> (Vec<char>, Vec<char>) {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/other/mod.rs:60:12
[INFO] [stdout]    |
[INFO] [stdout] 60 |     pub fn new() -> Queue {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:106:34
[INFO] [stdout]     |
[INFO] [stdout] 106 | pub extern fn selectionSort(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                  ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:106:47
[INFO] [stdout]     |
[INFO] [stdout] 106 | pub extern fn selectionSort(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                               ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:143:39
[INFO] [stdout]     |
[INFO] [stdout] 143 | pub extern fn MergeSelectionSort(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                       ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:143:52
[INFO] [stdout]     |
[INFO] [stdout] 143 | pub extern fn MergeSelectionSort(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                                    ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:170:24
[INFO] [stdout]     |
[INFO] [stdout] 170 | pub extern fn Merge(c: Vec<i32>, d: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                        ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:170:37
[INFO] [stdout]     |
[INFO] [stdout] 170 | pub extern fn Merge(c: Vec<i32>, d: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                     ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:170:50
[INFO] [stdout]     |
[INFO] [stdout] 170 | pub extern fn Merge(c: Vec<i32>, d: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                                  ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Queue`
[INFO] [stdout]  --> src/other/mod.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Queue {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push`
[INFO] [stdout]   --> src/other/mod.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn push(&mut self, element: char) -> () {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop_raw`
[INFO] [stdout]   --> src/other/mod.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub fn pop_raw(&mut self) -> Option<char> {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop_swap`
[INFO] [stdout]   --> src/other/mod.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn pop_swap(&mut self) -> Option<char> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `split`
[INFO] [stdout]   --> src/other/mod.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 55 |     pub fn split(self) -> (Vec<char>, Vec<char>) {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/other/mod.rs:60:12
[INFO] [stdout]    |
[INFO] [stdout] 60 |     pub fn new() -> Queue {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:106:34
[INFO] [stdout]     |
[INFO] [stdout] 106 | pub extern fn selectionSort(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                  ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:106:47
[INFO] [stdout]     |
[INFO] [stdout] 106 | pub extern fn selectionSort(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                               ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:143:39
[INFO] [stdout]     |
[INFO] [stdout] 143 | pub extern fn MergeSelectionSort(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                       ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:143:52
[INFO] [stdout]     |
[INFO] [stdout] 143 | pub extern fn MergeSelectionSort(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                                    ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:170:24
[INFO] [stdout]     |
[INFO] [stdout] 170 | pub extern fn Merge(c: Vec<i32>, d: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                        ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:170:37
[INFO] [stdout]     |
[INFO] [stdout] 170 | pub extern fn Merge(c: Vec<i32>, d: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                     ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:170:50
[INFO] [stdout]     |
[INFO] [stdout] 170 | pub extern fn Merge(c: Vec<i32>, d: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                                  ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Queue`
[INFO] [stdout]  --> src/other/mod.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Queue {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push`
[INFO] [stdout]   --> src/other/mod.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn push(&mut self, element: char) -> () {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop_raw`
[INFO] [stdout]   --> src/other/mod.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub fn pop_raw(&mut self) -> Option<char> {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop_swap`
[INFO] [stdout]   --> src/other/mod.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn pop_swap(&mut self) -> Option<char> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `split`
[INFO] [stdout]   --> src/other/mod.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 55 |     pub fn split(self) -> (Vec<char>, Vec<char>) {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/other/mod.rs:60:12
[INFO] [stdout]    |
[INFO] [stdout] 60 |     pub fn new() -> Queue {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:106:34
[INFO] [stdout]     |
[INFO] [stdout] 106 | pub extern fn selectionSort(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                  ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:106:47
[INFO] [stdout]     |
[INFO] [stdout] 106 | pub extern fn selectionSort(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                               ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:143:39
[INFO] [stdout]     |
[INFO] [stdout] 143 | pub extern fn MergeSelectionSort(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                       ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:143:52
[INFO] [stdout]     |
[INFO] [stdout] 143 | pub extern fn MergeSelectionSort(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                                    ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:170:24
[INFO] [stdout]     |
[INFO] [stdout] 170 | pub extern fn Merge(c: Vec<i32>, d: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                        ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:170:37
[INFO] [stdout]     |
[INFO] [stdout] 170 | pub extern fn Merge(c: Vec<i32>, d: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                     ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:170:50
[INFO] [stdout]     |
[INFO] [stdout] 170 | pub extern fn Merge(c: Vec<i32>, d: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                                  ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `split`
[INFO] [stdout]   --> src/other/mod.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 55 |     pub fn split(self) -> (Vec<char>, Vec<char>) {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:106:34
[INFO] [stdout]     |
[INFO] [stdout] 106 | pub extern fn selectionSort(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                  ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:106:47
[INFO] [stdout]     |
[INFO] [stdout] 106 | pub extern fn selectionSort(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                               ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:143:39
[INFO] [stdout]     |
[INFO] [stdout] 143 | pub extern fn MergeSelectionSort(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                       ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:143:52
[INFO] [stdout]     |
[INFO] [stdout] 143 | pub extern fn MergeSelectionSort(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                                    ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:170:24
[INFO] [stdout]     |
[INFO] [stdout] 170 | pub extern fn Merge(c: Vec<i32>, d: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                        ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:170:37
[INFO] [stdout]     |
[INFO] [stdout] 170 | pub extern fn Merge(c: Vec<i32>, d: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                     ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Vec<i32>`, which is not FFI-safe
[INFO] [stdout]    --> src/chapter_one/mod.rs:170:50
[INFO] [stdout]     |
[INFO] [stdout] 170 | pub extern fn Merge(c: Vec<i32>, d: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]     |                                                  ^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.37s
[INFO] running `Command { std: "docker" "inspect" "2db6b0bc75767ca42e6465053cdead1759f8b7ecde45aef793584d77dc613076", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2db6b0bc75767ca42e6465053cdead1759f8b7ecde45aef793584d77dc613076", kill_on_drop: false }`
[INFO] [stdout] 2db6b0bc75767ca42e6465053cdead1759f8b7ecde45aef793584d77dc613076