[INFO] cloning repository https://github.com/bitbangr/img_tile
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bitbangr/img_tile" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbitbangr%2Fimg_tile", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbitbangr%2Fimg_tile'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d44b4a63f4c1a7bca180137e3cab037fe7f8e5ea
[INFO] testing bitbangr/img_tile against try#722e1797249a965b6335aebd65d777f917e498f1 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbitbangr%2Fimg_tile" "/workspace/builds/worker-56/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-56/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bitbangr/img_tile on toolchain 722e1797249a965b6335aebd65d777f917e498f1
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/bitbangr/img_tile
[INFO] finished tweaking git repo https://github.com/bitbangr/img_tile
[INFO] tweaked toml for git repo https://github.com/bitbangr/img_tile written to /workspace/builds/worker-56/source/Cargo.toml
[INFO] crate git repo https://github.com/bitbangr/img_tile already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "start" "-a" "0cd228a8237c52ac71168bac53e1eee610b09a897d31c701ecd13d474c798d95", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5c7eaf7ac93705d9b25268570c15ba3917369f2649465908cd7fc87caa1b4e7c
[INFO] running `Command { std: "docker" "start" "-a" "5c7eaf7ac93705d9b25268570c15ba3917369f2649465908cd7fc87caa1b4e7c", kill_on_drop: false }`
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[INFO] [stderr]    Compiling crossbeam-epoch v0.9.4
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[INFO] [stderr]    Compiling printpdf v0.3.4
[INFO] [stderr]    Compiling img_tile v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `draw_summary_circles`
[INFO] [stdout]    --> src/pdf_util.rs:843:4
[INFO] [stdout]     |
[INFO] [stdout] 843 | fn draw_summary_circles(pdf_output_window: &Vec<Vec<(Box2D<i32, i32>, modtile::RGB)>>,
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `draw_diag`
[INFO] [stdout]    --> src/pdf_util.rs:897:4
[INFO] [stdout]     |
[INFO] [stdout] 897 | fn draw_diag(current_layer: &&PdfLayerReference) {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `draw_circle_with_pts_no_fill`
[INFO] [stdout]     --> src/pdf_util.rs:1167:4
[INFO] [stdout]      |
[INFO] [stdout] 1167 | fn draw_circle_with_pts_no_fill(current_layer: &&PdfLayerReference, offsetx_pt: Pt, offsety_pt: Pt, radius_pt: Pt) -> () {
[INFO] [stdout]      |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_points_for_circle`
[INFO] [stdout]     --> src/pdf_util.rs:1259:4
[INFO] [stdout]      |
[INFO] [stdout] 1259 | fn get_points_for_circle(xoff: f64, yoff: f64, scale: f64) -> Vec<(Point, bool)> {
[INFO] [stdout]      |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_and_save_test_config`
[INFO] [stdout]   --> src/modtile.rs:51:8
[INFO] [stdout]    |
[INFO] [stdout] 51 | pub fn create_and_save_test_config(path_str: &str) -> Config {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_allcolors_struct`
[INFO] [stdout]    --> src/modtile.rs:105:8
[INFO] [stdout]     |
[INFO] [stdout] 105 | pub fn test_allcolors_struct()  -> AllColors {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `old_load_all_colors`
[INFO] [stdout]    --> src/modtile.rs:188:8
[INFO] [stdout]     |
[INFO] [stdout] 188 | pub fn old_load_all_colors<P: AsRef<Path>>(path: P) -> AllColors {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `save_all_colors`
[INFO] [stdout]    --> src/modtile.rs:208:8
[INFO] [stdout]     |
[INFO] [stdout] 208 | pub fn save_all_colors<P: AsRef<Path>>(path: P, all_colors: AllColors) -> Result<()> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `save_config`
[INFO] [stdout]    --> src/modtile.rs:217:8
[INFO] [stdout]     |
[INFO] [stdout] 217 | pub fn save_config<P: AsRef<Path>>(path: P, config: &Config) -> Result<()> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/pdf_util.rs:969:13
[INFO] [stdout]     |
[INFO] [stdout] 969 |             &pdf_pane.push ((pdf_tile_box,pdf_tile_rgb));
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 969 |             let _ = &pdf_pane.push ((pdf_tile_box,pdf_tile_rgb));
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/pdf_util.rs:1082:9
[INFO] [stdout]      |
[INFO] [stdout] 1082 |         &ret.push (pane_box);
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1082 |         let _ = &ret.push (pane_box);
[INFO] [stdout]      |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2m 24s
[INFO] running `Command { std: "docker" "inspect" "5c7eaf7ac93705d9b25268570c15ba3917369f2649465908cd7fc87caa1b4e7c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5c7eaf7ac93705d9b25268570c15ba3917369f2649465908cd7fc87caa1b4e7c", kill_on_drop: false }`
[INFO] [stdout] 5c7eaf7ac93705d9b25268570c15ba3917369f2649465908cd7fc87caa1b4e7c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c6a541db3a26e05a03c03c91e053079a041b5c4f2f648f30f4fcad1d5f747db8
[INFO] running `Command { std: "docker" "start" "-a" "c6a541db3a26e05a03c03c91e053079a041b5c4f2f648f30f4fcad1d5f747db8", kill_on_drop: false }`
[INFO] [stderr]    Compiling img_tile v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `draw_summary_circles`
[INFO] [stdout]    --> src/pdf_util.rs:843:4
[INFO] [stdout]     |
[INFO] [stdout] 843 | fn draw_summary_circles(pdf_output_window: &Vec<Vec<(Box2D<i32, i32>, modtile::RGB)>>,
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `draw_diag`
[INFO] [stdout]    --> src/pdf_util.rs:897:4
[INFO] [stdout]     |
[INFO] [stdout] 897 | fn draw_diag(current_layer: &&PdfLayerReference) {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `draw_circle_with_pts_no_fill`
[INFO] [stdout]     --> src/pdf_util.rs:1167:4
[INFO] [stdout]      |
[INFO] [stdout] 1167 | fn draw_circle_with_pts_no_fill(current_layer: &&PdfLayerReference, offsetx_pt: Pt, offsety_pt: Pt, radius_pt: Pt) -> () {
[INFO] [stdout]      |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_points_for_circle`
[INFO] [stdout]     --> src/pdf_util.rs:1259:4
[INFO] [stdout]      |
[INFO] [stdout] 1259 | fn get_points_for_circle(xoff: f64, yoff: f64, scale: f64) -> Vec<(Point, bool)> {
[INFO] [stdout]      |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_and_save_test_config`
[INFO] [stdout]   --> src/modtile.rs:51:8
[INFO] [stdout]    |
[INFO] [stdout] 51 | pub fn create_and_save_test_config(path_str: &str) -> Config {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_allcolors_struct`
[INFO] [stdout]    --> src/modtile.rs:105:8
[INFO] [stdout]     |
[INFO] [stdout] 105 | pub fn test_allcolors_struct()  -> AllColors {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `old_load_all_colors`
[INFO] [stdout]    --> src/modtile.rs:188:8
[INFO] [stdout]     |
[INFO] [stdout] 188 | pub fn old_load_all_colors<P: AsRef<Path>>(path: P) -> AllColors {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `save_all_colors`
[INFO] [stdout]    --> src/modtile.rs:208:8
[INFO] [stdout]     |
[INFO] [stdout] 208 | pub fn save_all_colors<P: AsRef<Path>>(path: P, all_colors: AllColors) -> Result<()> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `save_config`
[INFO] [stdout]    --> src/modtile.rs:217:8
[INFO] [stdout]     |
[INFO] [stdout] 217 | pub fn save_config<P: AsRef<Path>>(path: P, config: &Config) -> Result<()> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/pdf_util.rs:969:13
[INFO] [stdout]     |
[INFO] [stdout] 969 |             &pdf_pane.push ((pdf_tile_box,pdf_tile_rgb));
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 969 |             let _ = &pdf_pane.push ((pdf_tile_box,pdf_tile_rgb));
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/pdf_util.rs:1082:9
[INFO] [stdout]      |
[INFO] [stdout] 1082 |         &ret.push (pane_box);
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1082 |         let _ = &ret.push (pane_box);
[INFO] [stdout]      |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.48s
[INFO] running `Command { std: "docker" "inspect" "c6a541db3a26e05a03c03c91e053079a041b5c4f2f648f30f4fcad1d5f747db8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6a541db3a26e05a03c03c91e053079a041b5c4f2f648f30f4fcad1d5f747db8", kill_on_drop: false }`
[INFO] [stdout] c6a541db3a26e05a03c03c91e053079a041b5c4f2f648f30f4fcad1d5f747db8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] a7a7e6b543c39904af217cb081ae207cf87080cd7b06c3920d9d07e2f397dc6f
[INFO] running `Command { std: "docker" "start" "-a" "a7a7e6b543c39904af217cb081ae207cf87080cd7b06c3920d9d07e2f397dc6f", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: function is never used: `draw_summary_circles`
[INFO] [stderr]    --> src/pdf_util.rs:843:4
[INFO] [stderr]     |
[INFO] [stderr] 843 | fn draw_summary_circles(pdf_output_window: &Vec<Vec<(Box2D<i32, i32>, modtile::RGB)>>,
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `draw_diag`
[INFO] [stderr]    --> src/pdf_util.rs:897:4
[INFO] [stderr]     |
[INFO] [stderr] 897 | fn draw_diag(current_layer: &&PdfLayerReference) {
[INFO] [stderr]     |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `draw_circle_with_pts_no_fill`
[INFO] [stderr]     --> src/pdf_util.rs:1167:4
[INFO] [stderr]      |
[INFO] [stderr] 1167 | fn draw_circle_with_pts_no_fill(current_layer: &&PdfLayerReference, offsetx_pt: Pt, offsety_pt: Pt, radius_pt: Pt) -> () {
[INFO] [stderr]      |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_points_for_circle`
[INFO] [stderr]     --> src/pdf_util.rs:1259:4
[INFO] [stderr]      |
[INFO] [stderr] 1259 | fn get_points_for_circle(xoff: f64, yoff: f64, scale: f64) -> Vec<(Point, bool)> {
[INFO] [stderr]      |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `create_and_save_test_config`
[INFO] [stderr]   --> src/modtile.rs:51:8
[INFO] [stderr]    |
[INFO] [stderr] 51 | pub fn create_and_save_test_config(path_str: &str) -> Config {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test_allcolors_struct`
[INFO] [stderr]    --> src/modtile.rs:105:8
[INFO] [stderr]     |
[INFO] [stderr] 105 | pub fn test_allcolors_struct()  -> AllColors {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `old_load_all_colors`
[INFO] [stderr]    --> src/modtile.rs:188:8
[INFO] [stderr]     |
[INFO] [stderr] 188 | pub fn old_load_all_colors<P: AsRef<Path>>(path: P) -> AllColors {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `save_all_colors`
[INFO] [stderr]    --> src/modtile.rs:208:8
[INFO] [stderr]     |
[INFO] [stderr] 208 | pub fn save_all_colors<P: AsRef<Path>>(path: P, all_colors: AllColors) -> Result<()> {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `save_config`
[INFO] [stderr]    --> src/modtile.rs:217:8
[INFO] [stderr]     |
[INFO] [stderr] 217 | pub fn save_config<P: AsRef<Path>>(path: P, config: &Config) -> Result<()> {
[INFO] [stderr]     |        ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]    --> src/pdf_util.rs:969:13
[INFO] [stderr]     |
[INFO] [stderr] 969 |             &pdf_pane.push ((pdf_tile_box,pdf_tile_rgb));
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 969 |             let _ = &pdf_pane.push ((pdf_tile_box,pdf_tile_rgb));
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]     --> src/pdf_util.rs:1082:9
[INFO] [stderr]      |
[INFO] [stderr] 1082 |         &ret.push (pane_box);
[INFO] [stderr]      |         ^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]      |
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1082 |         let _ = &ret.push (pane_box);
[INFO] [stderr]      |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `img_tile` (bin "img_tile" test) generated 11 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 6.91s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/img_tile-df89959ff0588c38)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "a7a7e6b543c39904af217cb081ae207cf87080cd7b06c3920d9d07e2f397dc6f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7a7e6b543c39904af217cb081ae207cf87080cd7b06c3920d9d07e2f397dc6f", kill_on_drop: false }`
[INFO] [stdout] a7a7e6b543c39904af217cb081ae207cf87080cd7b06c3920d9d07e2f397dc6f