[INFO] cloning repository https://github.com/Lee-Garcon/rust-raytracer-quest
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Lee-Garcon/rust-raytracer-quest" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLee-Garcon%2Frust-raytracer-quest", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLee-Garcon%2Frust-raytracer-quest'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6d8367c743a5b5a41165962fe792ce008d13a7da
[INFO] checking Lee-Garcon/rust-raytracer-quest against try#b1f2594eac607c1f051534800237eeedb5590a49 for pr-139493-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLee-Garcon%2Frust-raytracer-quest" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Lee-Garcon/rust-raytracer-quest
[INFO] finished tweaking git repo https://github.com/Lee-Garcon/rust-raytracer-quest
[INFO] tweaked toml for git repo https://github.com/Lee-Garcon/rust-raytracer-quest written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Lee-Garcon/rust-raytracer-quest on toolchain b1f2594eac607c1f051534800237eeedb5590a49
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b1f2594eac607c1f051534800237eeedb5590a49" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Lee-Garcon/rust-raytracer-quest 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" "+b1f2594eac607c1f051534800237eeedb5590a49" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:aa71247004a7fa38d13ec170f48f06cdedf5bc50b2a8645e56ed7e992e6fa513" "/opt/rustwide/cargo-home/bin/cargo" "+b1f2594eac607c1f051534800237eeedb5590a49" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "inspect" "32cc942aa2733d95f7fc30d9c6983963c7360b1481ace0ba5b2b6de7b65d9c3b", kill_on_drop: false }`
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[INFO] [stdout] warning: unused imports: `DynamicImage` and `GenericImage`
[INFO] [stdout]  --> src/frame/objects/assets/primitives/color.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | use image::{DynamicImage, GenericImage, Pixel, Rgba};
[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 import: `Rgba`
[INFO] [stdout]  --> src/frame/frame.rs:2:48
[INFO] [stdout]   |
[INFO] [stdout] 2 | use image::{DynamicImage, GenericImage, Pixel, Rgba};
[INFO] [stdout]   |                                                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `DynamicImage`, `GenericImage`, `Pixel`, and `Rgba`
[INFO] [stdout]   --> src/main.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 | use image::{DynamicImage, GenericImage, Pixel, Rgba};
[INFO] [stdout]    |             ^^^^^^^^^^^^  ^^^^^^^^^^^^  ^^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `DynamicImage` and `GenericImage`
[INFO] [stdout]  --> src/frame/objects/assets/primitives/color.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | use image::{DynamicImage, GenericImage, Pixel, Rgba};
[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 import: `Rgba`
[INFO] [stdout]  --> src/frame/frame.rs:2:48
[INFO] [stdout]   |
[INFO] [stdout] 2 | use image::{DynamicImage, GenericImage, Pixel, Rgba};
[INFO] [stdout]   |                                                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `DynamicImage`, `GenericImage`, `Pixel`, and `Rgba`
[INFO] [stdout]   --> src/main.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 | use image::{DynamicImage, GenericImage, Pixel, Rgba};
[INFO] [stdout]    |             ^^^^^^^^^^^^  ^^^^^^^^^^^^  ^^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Pixel`
[INFO] [stdout]  --> src/frame/frame.rs:2:41
[INFO] [stdout]   |
[INFO] [stdout] 2 | use image::{DynamicImage, GenericImage, Pixel, Rgba};
[INFO] [stdout]   |                                         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hit_point`
[INFO] [stdout]   --> src/frame/objects/assets/plane.rs:25:30
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn surface_normal(&self, hit_point: &Vector) -> Vector {
[INFO] [stdout]    |                              ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_hit_point`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `in_light`
[INFO] [stdout]    --> src/frame/frame.rs:110:25
[INFO] [stdout]     |
[INFO] [stdout] 110 |                     let in_light = shadow_intersection.is_none() ||
[INFO] [stdout]     |                         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_in_light`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]    --> src/frame/frame.rs:146:22
[INFO] [stdout]     |
[INFO] [stdout] 146 |                 Some(t) => Some(s)
[INFO] [stdout]     |                      ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     let mut element_vector = vec![
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:72:9
[INFO] [stdout]    |
[INFO] [stdout] 72 |     let mut light_vector = vec![
[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:80:9
[INFO] [stdout]    |
[INFO] [stdout] 80 |     let mut frame = Frame {
[INFO] [stdout]    |         ----^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `plane1`
[INFO] [stdout]   --> src/main.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let plane1 = Plane {
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_plane1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `plane2`
[INFO] [stdout]   --> src/main.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let plane2 = Plane {
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_plane2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `light2`
[INFO] [stdout]   --> src/main.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |     let light2 = Light::DirectionalLight(DirectionalLight {
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_light2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Plane` is never constructed
[INFO] [stdout]   --> src/frame/objects/element.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub enum Element {
[INFO] [stdout]    |          ------- variant in this enum
[INFO] [stdout] 11 |     Plane(Plane),
[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 `debug` is never used
[INFO] [stdout]   --> src/frame/objects/element.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl Element {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub fn debug(&self){
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `cross`, `display`, `debug`, and `values` are never used
[INFO] [stdout]   --> src/frame/objects/assets/primitives/vector.rs:72:12
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Vector {
[INFO] [stdout]    | ----------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 72 |     pub fn cross(&self, v: &Vector) -> Vector {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 77 |     pub fn display(&self) -> String {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 80 |     pub fn debug(&self) -> String {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 83 |     pub fn values(&self) -> (f64, f64, f64) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `values` and `display` are never used
[INFO] [stdout]   --> src/frame/objects/assets/primitives/ray.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl Ray {
[INFO] [stdout]    | -------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 16 |     pub fn values(&self) -> (Vector, Vector){
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     pub fn display(&self) -> String {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `max_recursion_depth` is never read
[INFO] [stdout]   --> src/frame/frame.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub struct Frame {
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub max_recursion_depth: u32
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:93:5
[INFO] [stdout]    |
[INFO] [stdout] 93 |     image.save("trace.png");
[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] 93 |     let _ = image.save("trace.png");
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/frame/frame.rs:141:18
[INFO] [stdout]     |
[INFO] [stdout] 141 |     pub fn trace(&self, ray: &Ray) -> Option<Intersection> {
[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] 141 |     pub fn trace(&self, ray: &Ray) -> Option<Intersection<'_>> {
[INFO] [stdout]     |                                                          ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Pixel`
[INFO] [stdout]  --> src/frame/frame.rs:2:41
[INFO] [stdout]   |
[INFO] [stdout] 2 | use image::{DynamicImage, GenericImage, Pixel, Rgba};
[INFO] [stdout]   |                                         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hit_point`
[INFO] [stdout]   --> src/frame/objects/assets/plane.rs:25:30
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn surface_normal(&self, hit_point: &Vector) -> Vector {
[INFO] [stdout]    |                              ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_hit_point`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `in_light`
[INFO] [stdout]    --> src/frame/frame.rs:110:25
[INFO] [stdout]     |
[INFO] [stdout] 110 |                     let in_light = shadow_intersection.is_none() ||
[INFO] [stdout]     |                         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_in_light`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]    --> src/frame/frame.rs:146:22
[INFO] [stdout]     |
[INFO] [stdout] 146 |                 Some(t) => Some(s)
[INFO] [stdout]     |                      ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     let mut element_vector = vec![
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:72:9
[INFO] [stdout]    |
[INFO] [stdout] 72 |     let mut light_vector = vec![
[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:80:9
[INFO] [stdout]    |
[INFO] [stdout] 80 |     let mut frame = Frame {
[INFO] [stdout]    |         ----^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `plane1`
[INFO] [stdout]   --> src/main.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let plane1 = Plane {
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_plane1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `plane2`
[INFO] [stdout]   --> src/main.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let plane2 = Plane {
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_plane2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `light2`
[INFO] [stdout]   --> src/main.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |     let light2 = Light::DirectionalLight(DirectionalLight {
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_light2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Plane` is never constructed
[INFO] [stdout]   --> src/frame/objects/element.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub enum Element {
[INFO] [stdout]    |          ------- variant in this enum
[INFO] [stdout] 11 |     Plane(Plane),
[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 `debug` is never used
[INFO] [stdout]   --> src/frame/objects/element.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl Element {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub fn debug(&self){
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `cross`, `display`, `debug`, and `values` are never used
[INFO] [stdout]   --> src/frame/objects/assets/primitives/vector.rs:72:12
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Vector {
[INFO] [stdout]    | ----------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 72 |     pub fn cross(&self, v: &Vector) -> Vector {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 77 |     pub fn display(&self) -> String {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 80 |     pub fn debug(&self) -> String {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 83 |     pub fn values(&self) -> (f64, f64, f64) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `values` and `display` are never used
[INFO] [stdout]   --> src/frame/objects/assets/primitives/ray.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl Ray {
[INFO] [stdout]    | -------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 16 |     pub fn values(&self) -> (Vector, Vector){
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     pub fn display(&self) -> String {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `max_recursion_depth` is never read
[INFO] [stdout]   --> src/frame/frame.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub struct Frame {
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub max_recursion_depth: u32
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:93:5
[INFO] [stdout]    |
[INFO] [stdout] 93 |     image.save("trace.png");
[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] 93 |     let _ = image.save("trace.png");
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/frame/frame.rs:141:18
[INFO] [stdout]     |
[INFO] [stdout] 141 |     pub fn trace(&self, ray: &Ray) -> Option<Intersection> {
[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] 141 |     pub fn trace(&self, ray: &Ray) -> Option<Intersection<'_>> {
[INFO] [stdout]     |                                                          ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 15.31s
[INFO] running `Command { std: "docker" "inspect" "77e470cdf908607d1b684a08282260a02d856340bce892f894623d48dbbc58c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "77e470cdf908607d1b684a08282260a02d856340bce892f894623d48dbbc58c3", kill_on_drop: false }`
[INFO] [stdout] 77e470cdf908607d1b684a08282260a02d856340bce892f894623d48dbbc58c3
