[INFO] cloning repository https://github.com/diptodip/raytracer
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/diptodip/raytracer" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdiptodip%2Fraytracer", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdiptodip%2Fraytracer'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e1823e7c86fef357c2fd8d84ad5d4deda77d1302
[INFO] checking diptodip/raytracer against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdiptodip%2Fraytracer" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/diptodip/raytracer on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/diptodip/raytracer
[INFO] finished tweaking git repo https://github.com/diptodip/raytracer
[INFO] tweaked toml for git repo https://github.com/diptodip/raytracer written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/diptodip/raytracer already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e00b63e375a62d5dec305c28d83dfbc2cd8faae5dd10e7f361e999b9d12379ec
[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" "e00b63e375a62d5dec305c28d83dfbc2cd8faae5dd10e7f361e999b9d12379ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e00b63e375a62d5dec305c28d83dfbc2cd8faae5dd10e7f361e999b9d12379ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e00b63e375a62d5dec305c28d83dfbc2cd8faae5dd10e7f361e999b9d12379ec", kill_on_drop: false }`
[INFO] [stdout] e00b63e375a62d5dec305c28d83dfbc2cd8faae5dd10e7f361e999b9d12379ec
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 72508407f52028ce884682f412a517651050888ace742e11901aba854e1d62ed
[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" "72508407f52028ce884682f412a517651050888ace742e11901aba854e1d62ed", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.5
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_chacha v0.1.1
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking crossbeam-channel v0.5.1
[INFO] [stderr]     Checking crossbeam-deque v0.8.0
[INFO] [stderr]     Checking raytracer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::f64::consts::PI`
[INFO] [stdout]  --> src/linalg.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::f64::consts::PI;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `linalg::dot`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use linalg::dot;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/io.rs:1:15
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fs::{self, File};
[INFO] [stdout]   |               ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `io::write_ppm`
[INFO] [stdout]   --> src/main.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | use io::write_ppm;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::f64::consts::PI`
[INFO] [stdout]  --> src/geometry.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::f64::consts::PI;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::rand::prelude::*`
[INFO] [stdout]  --> src/geometry.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::rand::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `geometry::find_intersections`
[INFO] [stdout]   --> src/main.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 | use geometry::find_intersections;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `geometry::Intersection`
[INFO] [stdout]   --> src/main.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | use geometry::Intersection;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `geometry::Intersects`
[INFO] [stdout]   --> src/main.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 | use geometry::Intersects;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::colors::RGB`
[INFO] [stdout]  --> src/camera.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use crate::colors::RGB;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::f64::consts::PI`
[INFO] [stdout]  --> src/ray.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::f64::consts::PI;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::materials::Material`
[INFO] [stdout]   --> src/ray.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | use crate::materials::Material;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/ray.rs:106:18
[INFO] [stdout]     |
[INFO] [stdout] 106 |     let r2_par = (-(1.0 - r2_per.length_squared()).sqrt() * intersection.local_normal);
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/ray.rs:184:16
[INFO] [stdout]     |
[INFO] [stdout] 184 |             if (col == (cols - 1)) {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::f64::consts::PI`
[INFO] [stdout]  --> src/linalg.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::f64::consts::PI;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `linalg::dot`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use linalg::dot;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/io.rs:1:15
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fs::{self, File};
[INFO] [stdout]   |               ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `io::write_ppm`
[INFO] [stdout]   --> src/main.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | use io::write_ppm;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::f64::consts::PI`
[INFO] [stdout]  --> src/geometry.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::f64::consts::PI;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::rand::prelude::*`
[INFO] [stdout]  --> src/geometry.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::rand::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `geometry::find_intersections`
[INFO] [stdout]   --> src/main.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 | use geometry::find_intersections;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `geometry::Intersection`
[INFO] [stdout]   --> src/main.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | use geometry::Intersection;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `geometry::Intersects`
[INFO] [stdout]   --> src/main.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 | use geometry::Intersects;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::colors::RGB`
[INFO] [stdout]  --> src/camera.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use crate::colors::RGB;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::f64::consts::PI`
[INFO] [stdout]  --> src/ray.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::f64::consts::PI;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::materials::Material`
[INFO] [stdout]   --> src/ray.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | use crate::materials::Material;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/ray.rs:106:18
[INFO] [stdout]     |
[INFO] [stdout] 106 |     let r2_par = (-(1.0 - r2_per.length_squared()).sqrt() * intersection.local_normal);
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/ray.rs:184:16
[INFO] [stdout]     |
[INFO] [stdout] 184 |             if (col == (cols - 1)) {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pixel_size`
[INFO] [stdout]   --> src/main.rs:43:22
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let (rows, cols, pixel_size) = imsize_to_pixels(
[INFO] [stdout]    |                      ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_pixel_size`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pixel_size`
[INFO] [stdout]    --> src/main.rs:122:22
[INFO] [stdout]     |
[INFO] [stdout] 122 |     let (rows, cols, pixel_size) = imsize_to_pixels(
[INFO] [stdout]     |                      ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_pixel_size`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/io.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |         let row = i / cols;
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `col`
[INFO] [stdout]   --> src/io.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |         let col = i % rows;
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_col`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `intersectable`
[INFO] [stdout]   --> src/ray.rs:39:48
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn diffuse_bounce(intersection: &Intersection, intersectable: &Intersectable) -> Ray {
[INFO] [stdout]    |                                                ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_intersectable`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `intersectable`
[INFO] [stdout]   --> src/ray.rs:47:41
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn reflect(intersection: &Intersection, intersectable: &Intersectable, ray: &Ray) -> Ray {
[INFO] [stdout]    |                                         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_intersectable`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `intersections`
[INFO] [stdout]    --> src/ray.rs:119:10
[INFO] [stdout]     |
[INFO] [stdout] 119 |     let (intersections, result) = find_intersections(ray, world);
[INFO] [stdout]     |          ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_intersections`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fuzz`
[INFO] [stdout]    --> src/ray.rs:137:52
[INFO] [stdout]     |
[INFO] [stdout] 137 |             } else if let Surface::FuzzyReflective(fuzz) = surface {
[INFO] [stdout]     |                                                    ^^^^ help: if this is intentional, prefix it with an underscore: `_fuzz`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r`
[INFO] [stdout]    --> src/ray.rs:146:47
[INFO] [stdout]     |
[INFO] [stdout] 146 |             } else if let Surface::Refractive(r) = surface {
[INFO] [stdout]     |                                               ^ help: if this is intentional, prefix it with an underscore: `_r`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sample`
[INFO] [stdout]    --> src/ray.rs:192:17
[INFO] [stdout]     |
[INFO] [stdout] 192 |             for sample in 0..samples_per_pixel as usize {
[INFO] [stdout]     |                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_sample`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/ray.rs:210:17
[INFO] [stdout]     |
[INFO] [stdout] 210 |             let mut pixel = &mut chunk[col];
[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/ray.rs:177:9
[INFO] [stdout]     |
[INFO] [stdout] 177 |     let mut completed_rows = AtomicUsize::new(0);
[INFO] [stdout]     |         ----^^^^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `imsize_to_fov`
[INFO] [stdout]   --> src/camera.rs:50:8
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub fn imsize_to_fov(image_plane_height: f64, image_plane_width: f64) -> (f64, f64) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_spheres`
[INFO] [stdout]   --> src/main.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn test_spheres() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/io.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     writeln!(f, "P3");
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/io.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     write!(f, "{}", cols);
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/io.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     write!(f, " ");
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/io.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     writeln!(f, "{}", rows);
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/io.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     writeln!(f, "{}", 255);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/io.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |         writeln!(f, "{} {} {} ", r, g, b);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/ray.rs:217:5
[INFO] [stdout]     |
[INFO] [stdout] 217 |     write_ppm(image, rows, cols);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 35 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pixel_size`
[INFO] [stdout]   --> src/main.rs:43:22
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let (rows, cols, pixel_size) = imsize_to_pixels(
[INFO] [stdout]    |                      ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_pixel_size`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pixel_size`
[INFO] [stdout]    --> src/main.rs:122:22
[INFO] [stdout]     |
[INFO] [stdout] 122 |     let (rows, cols, pixel_size) = imsize_to_pixels(
[INFO] [stdout]     |                      ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_pixel_size`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/io.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |         let row = i / cols;
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `col`
[INFO] [stdout]   --> src/io.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |         let col = i % rows;
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_col`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `intersectable`
[INFO] [stdout]   --> src/ray.rs:39:48
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn diffuse_bounce(intersection: &Intersection, intersectable: &Intersectable) -> Ray {
[INFO] [stdout]    |                                                ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_intersectable`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `intersectable`
[INFO] [stdout]   --> src/ray.rs:47:41
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn reflect(intersection: &Intersection, intersectable: &Intersectable, ray: &Ray) -> Ray {
[INFO] [stdout]    |                                         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_intersectable`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `intersections`
[INFO] [stdout]    --> src/ray.rs:119:10
[INFO] [stdout]     |
[INFO] [stdout] 119 |     let (intersections, result) = find_intersections(ray, world);
[INFO] [stdout]     |          ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_intersections`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fuzz`
[INFO] [stdout]    --> src/ray.rs:137:52
[INFO] [stdout]     |
[INFO] [stdout] 137 |             } else if let Surface::FuzzyReflective(fuzz) = surface {
[INFO] [stdout]     |                                                    ^^^^ help: if this is intentional, prefix it with an underscore: `_fuzz`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r`
[INFO] [stdout]    --> src/ray.rs:146:47
[INFO] [stdout]     |
[INFO] [stdout] 146 |             } else if let Surface::Refractive(r) = surface {
[INFO] [stdout]     |                                               ^ help: if this is intentional, prefix it with an underscore: `_r`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sample`
[INFO] [stdout]    --> src/ray.rs:192:17
[INFO] [stdout]     |
[INFO] [stdout] 192 |             for sample in 0..samples_per_pixel as usize {
[INFO] [stdout]     |                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_sample`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/ray.rs:210:17
[INFO] [stdout]     |
[INFO] [stdout] 210 |             let mut pixel = &mut chunk[col];
[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/ray.rs:177:9
[INFO] [stdout]     |
[INFO] [stdout] 177 |     let mut completed_rows = AtomicUsize::new(0);
[INFO] [stdout]     |         ----^^^^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `imsize_to_fov`
[INFO] [stdout]   --> src/camera.rs:50:8
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub fn imsize_to_fov(image_plane_height: f64, image_plane_width: f64) -> (f64, f64) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_spheres`
[INFO] [stdout]   --> src/main.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn test_spheres() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/io.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     writeln!(f, "P3");
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/io.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     write!(f, "{}", cols);
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/io.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     write!(f, " ");
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/io.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     writeln!(f, "{}", rows);
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/io.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     writeln!(f, "{}", 255);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/io.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |         writeln!(f, "{} {} {} ", r, g, b);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/ray.rs:217:5
[INFO] [stdout]     |
[INFO] [stdout] 217 |     write_ppm(image, rows, cols);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 35 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.18s
[INFO] running `Command { std: "docker" "inspect" "72508407f52028ce884682f412a517651050888ace742e11901aba854e1d62ed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "72508407f52028ce884682f412a517651050888ace742e11901aba854e1d62ed", kill_on_drop: false }`
[INFO] [stdout] 72508407f52028ce884682f412a517651050888ace742e11901aba854e1d62ed