[INFO] cloning repository https://github.com/mark2b/fb2d
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mark2b/fb2d" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmark2b%2Ffb2d", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmark2b%2Ffb2d'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fa61032802aa29c138c8e6aaeacd7732c9933691
[INFO] building mark2b/fb2d against master#ff34b919075f35a1787659e9c448a34b06bab8de for issue-85264
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmark2b%2Ffb2d" "/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/mark2b/fb2d on toolchain ff34b919075f35a1787659e9c448a34b06bab8de
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mark2b/fb2d
[INFO] removed 0 missing examples
[INFO] finished tweaking git repo https://github.com/mark2b/fb2d
[INFO] tweaked toml for git repo https://github.com/mark2b/fb2d written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/mark2b/fb2d already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "fetch" "--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-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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 628b30d1b5773aa21a5b374bdb573b5f293a23ecc0bfdfc16eb79b17f3977bc8
[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" "628b30d1b5773aa21a5b374bdb573b5f293a23ecc0bfdfc16eb79b17f3977bc8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "628b30d1b5773aa21a5b374bdb573b5f293a23ecc0bfdfc16eb79b17f3977bc8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "628b30d1b5773aa21a5b374bdb573b5f293a23ecc0bfdfc16eb79b17f3977bc8", kill_on_drop: false }`
[INFO] [stdout] 628b30d1b5773aa21a5b374bdb573b5f293a23ecc0bfdfc16eb79b17f3977bc8
[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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 824000f6936108e5f4d9c1943707ea4f8fa53dc1a1e70712c9cebfe9100937de
[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" "824000f6936108e5f4d9c1943707ea4f8fa53dc1a1e70712c9cebfe9100937de", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.39
[INFO] [stderr]    Compiling cfg-if v0.1.2
[INFO] [stderr]    Compiling num-traits v0.2.2
[INFO] [stderr]    Compiling nodrop v0.1.12
[INFO] [stderr]    Compiling build_const v0.2.0
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling rayon-core v1.4.0
[INFO] [stderr]    Compiling bitflags v1.0.1
[INFO] [stderr]    Compiling either v1.4.0
[INFO] [stderr]    Compiling unicode-width v0.1.4
[INFO] [stderr]    Compiling bitflags v0.9.1
[INFO] [stderr]    Compiling transformation-pipeline v0.1.0
[INFO] [stderr]    Compiling remove_dir_all v0.5.0
[INFO] [stderr]    Compiling vec_map v0.8.0
[INFO] [stderr]    Compiling bzip2-sys v0.1.6
[INFO] [stderr]    Compiling miniz_oxide_c_api v0.1.2
[INFO] [stderr]    Compiling inflate v0.3.4
[INFO] [stderr]    Compiling stb_truetype v0.2.2
[INFO] [stderr]    Compiling gif v0.9.2
[INFO] [stderr]    Compiling crossbeam-utils v0.2.2
[INFO] [stderr]    Compiling log v0.4.1
[INFO] [stderr]    Compiling arrayvec v0.4.7
[INFO] [stderr]    Compiling xml-rs v0.7.0
[INFO] [stderr]    Compiling textwrap v0.9.0
[INFO] [stderr]    Compiling unreachable v0.1.1
[INFO] [stderr]    Compiling crc v1.7.0
[INFO] [stderr]    Compiling num-traits v0.1.43
[INFO] [stderr]    Compiling num-integer v0.1.36
[INFO] [stderr]    Compiling crossbeam-epoch v0.3.1
[INFO] [stderr]    Compiling time v0.1.39
[INFO] [stderr]    Compiling rand v0.4.2
[INFO] [stderr]    Compiling miniz_oxide v0.1.2
[INFO] [stderr]    Compiling num_cpus v1.8.0
[INFO] [stderr]    Compiling atty v0.2.8
[INFO] [stderr]    Compiling nix v0.9.0
[INFO] [stderr]    Compiling memmap v0.5.2
[INFO] [stderr]    Compiling ordered-float v0.5.0
[INFO] [stderr]    Compiling enum_primitive v0.1.1
[INFO] [stderr]    Compiling msdos_time v0.1.5
[INFO] [stderr]    Compiling vergen v0.1.1
[INFO] [stderr]    Compiling clap v2.31.2
[INFO] [stderr]    Compiling num-iter v0.1.35
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling rusttype v0.5.2
[INFO] [stderr]    Compiling crossbeam-deque v0.2.0
[INFO] [stderr]    Compiling png v0.11.0
[INFO] [stderr]    Compiling uuid v0.6.2
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]    Compiling fb2d v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling bzip2 v0.3.2
[INFO] [stderr]    Compiling flate2 v1.0.1
[INFO] [stderr]    Compiling rayon v1.0.1
[INFO] [stderr]    Compiling zip v0.2.8
[INFO] [stderr]    Compiling unzip v0.1.0
[INFO] [stderr]    Compiling ctrlc v3.1.0
[INFO] [stderr]    Compiling jpeg-decoder v0.1.14
[INFO] [stderr]    Compiling image v0.18.0
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/screen_writer.rs:72:6
[INFO] [stdout]    |
[INFO] [stdout] 72 | impl ScreenWriter {}
[INFO] [stdout]    |      ^^^^^^^^^^^^ help: use `dyn`: `dyn ScreenWriter`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/node.rs:20:17
[INFO] [stdout]    |
[INFO] [stdout] 20 |     sprite: Box<Sprite<'a>>,
[INFO] [stdout]    |                 ^^^^^^^^^^ help: use `dyn`: `dyn Sprite<'a>`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/scene.rs:17:28
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub writer: Option<Box<ScreenWriter>>,
[INFO] [stdout]    |                            ^^^^^^^^^^^^ help: use `dyn`: `dyn ScreenWriter`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/sprite.rs:16:10
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl<'a> Sprite<'a> {}
[INFO] [stdout]    |          ^^^^^^^^^^ help: use `dyn`: `dyn Sprite<'a>`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/texture.rs:63:17
[INFO] [stdout]    |
[INFO] [stdout] 63 |             Err(e) => {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/scene.rs:73:21
[INFO] [stdout]    |
[INFO] [stdout] 73 |                 let mut children_keys = key_cell.borrow_mut();
[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/scene.rs:101:29
[INFO] [stdout]     |
[INFO] [stdout] 101 |                         let mut children_keys = key_cell.borrow_mut();
[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/scene.rs:120:21
[INFO] [stdout]     |
[INFO] [stdout] 120 |                 let mut children_keys = key_cell.borrow_mut();
[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/scene.rs:134:29
[INFO] [stdout]     |
[INFO] [stdout] 134 |                         let mut children_keys = key_cell.borrow_mut();
[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/scene.rs:154:21
[INFO] [stdout]     |
[INFO] [stdout] 154 |                 let mut children_keys = key_cell.borrow_mut();
[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/scene.rs:177:29
[INFO] [stdout]     |
[INFO] [stdout] 177 |                         let mut children_keys = key_cell.borrow_mut();
[INFO] [stdout]     |                             ----^^^^^^^^^^^^^
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> bin/show.rs:42:17
[INFO] [stdout]    |
[INFO] [stdout] 42 |             let mut fb = fb2d::screen_writer_for_framebuffer("/dev/fb0")?;
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 24.79s
[INFO] running `Command { std: "docker" "inspect" "824000f6936108e5f4d9c1943707ea4f8fa53dc1a1e70712c9cebfe9100937de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "824000f6936108e5f4d9c1943707ea4f8fa53dc1a1e70712c9cebfe9100937de", kill_on_drop: false }`
[INFO] [stdout] 824000f6936108e5f4d9c1943707ea4f8fa53dc1a1e70712c9cebfe9100937de
[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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f5417a796b1f87c9d95c522860e25e74c0801929c7d6d4e819bd07bd6847d8e4
[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" "f5417a796b1f87c9d95c522860e25e74c0801929c7d6d4e819bd07bd6847d8e4", kill_on_drop: false }`
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/screen_writer.rs:72:6
[INFO] [stdout]    |
[INFO] [stdout] 72 | impl ScreenWriter {}
[INFO] [stdout]    |      ^^^^^^^^^^^^ help: use `dyn`: `dyn ScreenWriter`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/node.rs:20:17
[INFO] [stdout]    |
[INFO] [stdout] 20 |     sprite: Box<Sprite<'a>>,
[INFO] [stdout]    |                 ^^^^^^^^^^ help: use `dyn`: `dyn Sprite<'a>`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling fb2d v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/scene.rs:17:28
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub writer: Option<Box<ScreenWriter>>,
[INFO] [stdout]    |                            ^^^^^^^^^^^^ help: use `dyn`: `dyn ScreenWriter`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/sprite.rs:16:10
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl<'a> Sprite<'a> {}
[INFO] [stdout]    |          ^^^^^^^^^^ help: use `dyn`: `dyn Sprite<'a>`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/texture.rs:63:17
[INFO] [stdout]    |
[INFO] [stdout] 63 |             Err(e) => {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/scene.rs:73:21
[INFO] [stdout]    |
[INFO] [stdout] 73 |                 let mut children_keys = key_cell.borrow_mut();
[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/scene.rs:101:29
[INFO] [stdout]     |
[INFO] [stdout] 101 |                         let mut children_keys = key_cell.borrow_mut();
[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/scene.rs:120:21
[INFO] [stdout]     |
[INFO] [stdout] 120 |                 let mut children_keys = key_cell.borrow_mut();
[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/scene.rs:134:29
[INFO] [stdout]     |
[INFO] [stdout] 134 |                         let mut children_keys = key_cell.borrow_mut();
[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/scene.rs:154:21
[INFO] [stdout]     |
[INFO] [stdout] 154 |                 let mut children_keys = key_cell.borrow_mut();
[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/scene.rs:177:29
[INFO] [stdout]     |
[INFO] [stdout] 177 |                         let mut children_keys = key_cell.borrow_mut();
[INFO] [stdout]     |                             ----^^^^^^^^^^^^^
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> bin/show.rs:42:17
[INFO] [stdout]    |
[INFO] [stdout] 42 |             let mut fb = fb2d::screen_writer_for_framebuffer("/dev/fb0")?;
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/screen_writer.rs:72:6
[INFO] [stdout]    |
[INFO] [stdout] 72 | impl ScreenWriter {}
[INFO] [stdout]    |      ^^^^^^^^^^^^ help: use `dyn`: `dyn ScreenWriter`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/node.rs:20:17
[INFO] [stdout]    |
[INFO] [stdout] 20 |     sprite: Box<Sprite<'a>>,
[INFO] [stdout]    |                 ^^^^^^^^^^ help: use `dyn`: `dyn Sprite<'a>`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/scene.rs:17:28
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub writer: Option<Box<ScreenWriter>>,
[INFO] [stdout]    |                            ^^^^^^^^^^^^ help: use `dyn`: `dyn ScreenWriter`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/sprite.rs:16:10
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl<'a> Sprite<'a> {}
[INFO] [stdout]    |          ^^^^^^^^^^ help: use `dyn`: `dyn Sprite<'a>`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> examples/simple_sprite.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |         sprite2,
[INFO] [stdout]    |         ^^^^^^^ expected struct `TextureSprite`, found enum `Result`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected struct `TextureSprite`
[INFO] [stdout]                 found enum `Result<TextureSprite, &str>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/texture.rs:63:17
[INFO] [stdout]    |
[INFO] [stdout] 63 |             Err(e) => {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `fb2d`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/scene.rs:73:21
[INFO] [stdout]    |
[INFO] [stdout] 73 |                 let mut children_keys = key_cell.borrow_mut();
[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/scene.rs:101:29
[INFO] [stdout]     |
[INFO] [stdout] 101 |                         let mut children_keys = key_cell.borrow_mut();
[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/scene.rs:120:21
[INFO] [stdout]     |
[INFO] [stdout] 120 |                 let mut children_keys = key_cell.borrow_mut();
[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/scene.rs:134:29
[INFO] [stdout]     |
[INFO] [stdout] 134 |                         let mut children_keys = key_cell.borrow_mut();
[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/scene.rs:154:21
[INFO] [stdout]     |
[INFO] [stdout] 154 |                 let mut children_keys = key_cell.borrow_mut();
[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/scene.rs:177:29
[INFO] [stdout]     |
[INFO] [stdout] 177 |                         let mut children_keys = key_cell.borrow_mut();
[INFO] [stdout]     |                             ----^^^^^^^^^^^^^
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "f5417a796b1f87c9d95c522860e25e74c0801929c7d6d4e819bd07bd6847d8e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f5417a796b1f87c9d95c522860e25e74c0801929c7d6d4e819bd07bd6847d8e4", kill_on_drop: false }`
[INFO] [stdout] f5417a796b1f87c9d95c522860e25e74c0801929c7d6d4e819bd07bd6847d8e4
