[INFO] cloning repository https://github.com/HarveyHunt/rayblaster
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/HarveyHunt/rayblaster" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHarveyHunt%2Frayblaster", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHarveyHunt%2Frayblaster'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4df2b6a49c3ca46b7085ca24fe7591a7bb2152c5
[INFO] checking HarveyHunt/rayblaster against beta-2020-07-24 for pr-75494-beta
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHarveyHunt%2Frayblaster" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/HarveyHunt/rayblaster on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/HarveyHunt/rayblaster
[INFO] finished tweaking git repo https://github.com/HarveyHunt/rayblaster
[INFO] tweaked toml for git repo https://github.com/HarveyHunt/rayblaster written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/HarveyHunt/rayblaster already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d41beff69f4fe6e9ded281b765c8d962aae57fb854bc43dbc3e7c2b68dec2a3e
[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" "d41beff69f4fe6e9ded281b765c8d962aae57fb854bc43dbc3e7c2b68dec2a3e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d41beff69f4fe6e9ded281b765c8d962aae57fb854bc43dbc3e7c2b68dec2a3e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d41beff69f4fe6e9ded281b765c8d962aae57fb854bc43dbc3e7c2b68dec2a3e", kill_on_drop: false }`
[INFO] [stdout] d41beff69f4fe6e9ded281b765c8d962aae57fb854bc43dbc3e7c2b68dec2a3e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4538acf61fbbcff1a306acb150535cb22b87db64d188ab9dd2bdacfba8fa3f35
[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" "4538acf61fbbcff1a306acb150535cb22b87db64d188ab9dd2bdacfba8fa3f35", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking libc v0.2.28
[INFO] [stderr]     Checking num-traits v0.1.40
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]    Compiling gcc v0.3.51
[INFO] [stderr]     Checking either v1.1.0
[INFO] [stderr]     Checking scopeguard v0.3.2
[INFO] [stderr]    Compiling rayon-core v1.2.1
[INFO] [stderr]     Checking futures v0.1.14
[INFO] [stderr]     Checking inflate v0.1.1
[INFO] [stderr]     Checking bitflags v0.7.0
[INFO] [stderr]     Checking color_quant v1.0.0
[INFO] [stderr]     Checking lzw v0.10.0
[INFO] [stderr]     Checking byteorder v1.1.0
[INFO] [stderr]     Checking scoped_threadpool v0.1.7
[INFO] [stderr]     Checking glob v0.2.11
[INFO] [stderr]     Checking byteorder v0.5.3
[INFO] [stderr]     Checking crossbeam v0.3.0
[INFO] [stderr]     Checking argparse v0.2.1
[INFO] [stderr]     Checking coco v0.1.1
[INFO] [stderr]     Checking gif v0.9.2
[INFO] [stderr]     Checking rand v0.3.16
[INFO] [stderr]     Checking num_cpus v1.6.2
[INFO] [stderr]     Checking num-integer v0.1.35
[INFO] [stderr]     Checking enum_primitive v0.1.1
[INFO] [stderr]     Checking num-iter v0.1.34
[INFO] [stderr]    Compiling miniz-sys v0.1.9
[INFO] [stderr]     Checking flate2 v0.2.19
[INFO] [stderr]     Checking rayon v0.8.2
[INFO] [stderr]     Checking png v0.5.2
[INFO] [stderr]     Checking num-bigint v0.1.40
[INFO] [stderr]     Checking num-complex v0.1.40
[INFO] [stderr]     Checking jpeg-decoder v0.1.13
[INFO] [stderr]     Checking num-rational v0.1.39
[INFO] [stderr]     Checking num v0.1.40
[INFO] [stderr]     Checking image v0.10.4
[INFO] [stderr]     Checking cgmath v0.9.1
[INFO] [stderr]     Checking rayblaster v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/renderer/renderer.rs:122:24
[INFO] [stdout]     |
[INFO] [stdout] 122 |         let prim: &Box<Primitive + Sync>;
[INFO] [stdout]     |                        ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Primitive + Sync`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/renderer/renderer.rs:164:69
[INFO] [stdout]     |
[INFO] [stdout] 164 |     fn trace_primary(&self, ray: Ray) -> Option<(Intersection, &Box<Primitive + Sync>)> {
[INFO] [stdout]     |                                                                     ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Primitive + Sync`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/renderer/renderer.rs:166:52
[INFO] [stdout]     |
[INFO] [stdout] 166 |         let mut result: Option<(Intersection, &Box<Primitive + Sync>)> = None;
[INFO] [stdout]     |                                                    ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Primitive + Sync`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/renderer/intersection.rs:8:27
[INFO] [stdout]   |
[INFO] [stdout] 8 |     pub material: &'a Box<Material + Sync + 'a>,
[INFO] [stdout]   |                           ^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Material + Sync + 'a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/primitives/sphere.rs:9:23
[INFO] [stdout]   |
[INFO] [stdout] 9 |     pub material: Box<Material + Sync>,
[INFO] [stdout]   |                       ^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Material + Sync`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/primitives/plane.rs:9:23
[INFO] [stdout]   |
[INFO] [stdout] 9 |     pub material: Box<Material + Sync>,
[INFO] [stdout]   |                       ^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Material + Sync`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/scenes/spheres.rs:8:28
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut prims: Vec<Box<Primitive + Sync>> = Vec::new();
[INFO] [stdout]   |                            ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Primitive + Sync`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/scenes/spheres.rs:70:25
[INFO] [stdout]    |
[INFO] [stdout] 70 |     let mut ls: Vec<Box<Light + Sync>> = Vec::new();
[INFO] [stdout]    |                         ^^^^^^^^^^^^ help: use `dyn`: `dyn Light + Sync`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/scenes/mod.rs:7:25
[INFO] [stdout]   |
[INFO] [stdout] 7 |     pub lights: Vec<Box<Light + Sync>>,
[INFO] [stdout]   |                         ^^^^^^^^^^^^ help: use `dyn`: `dyn Light + Sync`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/scenes/mod.rs:8:29
[INFO] [stdout]   |
[INFO] [stdout] 8 |     pub primitives: Vec<Box<Primitive + Sync>>,
[INFO] [stdout]   |                             ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Primitive + Sync`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/renderer/renderer.rs:122:24
[INFO] [stdout]     |
[INFO] [stdout] 122 |         let prim: &Box<Primitive + Sync>;
[INFO] [stdout]     |                        ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Primitive + Sync`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/renderer/renderer.rs:164:69
[INFO] [stdout]     |
[INFO] [stdout] 164 |     fn trace_primary(&self, ray: Ray) -> Option<(Intersection, &Box<Primitive + Sync>)> {
[INFO] [stdout]     |                                                                     ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Primitive + Sync`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/renderer/renderer.rs:166:52
[INFO] [stdout]     |
[INFO] [stdout] 166 |         let mut result: Option<(Intersection, &Box<Primitive + Sync>)> = None;
[INFO] [stdout]     |                                                    ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Primitive + Sync`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/renderer/intersection.rs:8:27
[INFO] [stdout]   |
[INFO] [stdout] 8 |     pub material: &'a Box<Material + Sync + 'a>,
[INFO] [stdout]   |                           ^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Material + Sync + 'a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/primitives/sphere.rs:9:23
[INFO] [stdout]   |
[INFO] [stdout] 9 |     pub material: Box<Material + Sync>,
[INFO] [stdout]   |                       ^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Material + Sync`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/primitives/plane.rs:9:23
[INFO] [stdout]   |
[INFO] [stdout] 9 |     pub material: Box<Material + Sync>,
[INFO] [stdout]   |                       ^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Material + Sync`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/scenes/spheres.rs:8:28
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut prims: Vec<Box<Primitive + Sync>> = Vec::new();
[INFO] [stdout]   |                            ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Primitive + Sync`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/scenes/spheres.rs:70:25
[INFO] [stdout]    |
[INFO] [stdout] 70 |     let mut ls: Vec<Box<Light + Sync>> = Vec::new();
[INFO] [stdout]    |                         ^^^^^^^^^^^^ help: use `dyn`: `dyn Light + Sync`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/scenes/mod.rs:7:25
[INFO] [stdout]   |
[INFO] [stdout] 7 |     pub lights: Vec<Box<Light + Sync>>,
[INFO] [stdout]   |                         ^^^^^^^^^^^^ help: use `dyn`: `dyn Light + Sync`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/scenes/mod.rs:8:29
[INFO] [stdout]   |
[INFO] [stdout] 8 |     pub primitives: Vec<Box<Primitive + Sync>>,
[INFO] [stdout]   |                             ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Primitive + Sync`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `sample_index` is never read
[INFO] [stdout]   --> src/renderer/renderer.rs:90:13
[INFO] [stdout]    |
[INFO] [stdout] 90 |         let mut sample_index = 0;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `prim` is assigned to, but never used
[INFO] [stdout]    --> src/renderer/renderer.rs:122:13
[INFO] [stdout]     |
[INFO] [stdout] 122 |         let prim: &Box<Primitive + Sync>;
[INFO] [stdout]     |             ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]     = note: consider using `_prim` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `prim` is never read
[INFO] [stdout]    --> src/renderer/renderer.rs:128:17
[INFO] [stdout]     |
[INFO] [stdout] 128 |                 prim = p
[INFO] [stdout]     |                 ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `int`
[INFO] [stdout]    --> src/renderer/renderer.rs:158:19
[INFO] [stdout]     |
[INFO] [stdout] 158 |             Some((int, prim)) => true,
[INFO] [stdout]     |                   ^^^ help: if this is intentional, prefix it with an underscore: `_int`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `prim`
[INFO] [stdout]    --> src/renderer/renderer.rs:158:24
[INFO] [stdout]     |
[INFO] [stdout] 158 |             Some((int, prim)) => true,
[INFO] [stdout]     |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_prim`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `depth`
[INFO] [stdout]   --> src/renderer/ray.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     depth: u32,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `t`
[INFO] [stdout]   --> src/renderer/ray.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     t: RayType,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `fov`
[INFO] [stdout]   --> src/renderer/renderer.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fov: f64,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/main.rs:89:5
[INFO] [stdout]    |
[INFO] [stdout] 89 | /     save_buffer(image_path,
[INFO] [stdout] 90 | |                 &buffer,
[INFO] [stdout] 91 | |                 width as u32,
[INFO] [stdout] 92 | |                 height as u32,
[INFO] [stdout] 93 | |                 image::RGB(8));
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: 19 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `sample_index` is never read
[INFO] [stdout]   --> src/renderer/renderer.rs:90:13
[INFO] [stdout]    |
[INFO] [stdout] 90 |         let mut sample_index = 0;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `prim` is assigned to, but never used
[INFO] [stdout]    --> src/renderer/renderer.rs:122:13
[INFO] [stdout]     |
[INFO] [stdout] 122 |         let prim: &Box<Primitive + Sync>;
[INFO] [stdout]     |             ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]     = note: consider using `_prim` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `prim` is never read
[INFO] [stdout]    --> src/renderer/renderer.rs:128:17
[INFO] [stdout]     |
[INFO] [stdout] 128 |                 prim = p
[INFO] [stdout]     |                 ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `int`
[INFO] [stdout]    --> src/renderer/renderer.rs:158:19
[INFO] [stdout]     |
[INFO] [stdout] 158 |             Some((int, prim)) => true,
[INFO] [stdout]     |                   ^^^ help: if this is intentional, prefix it with an underscore: `_int`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `prim`
[INFO] [stdout]    --> src/renderer/renderer.rs:158:24
[INFO] [stdout]     |
[INFO] [stdout] 158 |             Some((int, prim)) => true,
[INFO] [stdout]     |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_prim`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `depth`
[INFO] [stdout]   --> src/renderer/ray.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     depth: u32,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `t`
[INFO] [stdout]   --> src/renderer/ray.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     t: RayType,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `fov`
[INFO] [stdout]   --> src/renderer/renderer.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fov: f64,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/main.rs:89:5
[INFO] [stdout]    |
[INFO] [stdout] 89 | /     save_buffer(image_path,
[INFO] [stdout] 90 | |                 &buffer,
[INFO] [stdout] 91 | |                 width as u32,
[INFO] [stdout] 92 | |                 height as u32,
[INFO] [stdout] 93 | |                 image::RGB(8));
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: 19 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 25.43s
[INFO] running `Command { std: "docker" "inspect" "4538acf61fbbcff1a306acb150535cb22b87db64d188ab9dd2bdacfba8fa3f35", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4538acf61fbbcff1a306acb150535cb22b87db64d188ab9dd2bdacfba8fa3f35", kill_on_drop: false }`
[INFO] [stdout] 4538acf61fbbcff1a306acb150535cb22b87db64d188ab9dd2bdacfba8fa3f35
