[INFO] cloning repository https://github.com/LogoiLab/fuc
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/LogoiLab/fuc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLogoiLab%2Ffuc", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLogoiLab%2Ffuc'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7f48c0e81ccb0e62d1c77709e56b567c150fffec
[INFO] testing LogoiLab/fuc against try#ce59db7a1b1b012fb2793c4641c1bdecad7a128b for pr-85530
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLogoiLab%2Ffuc" "/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/LogoiLab/fuc on toolchain ce59db7a1b1b012fb2793c4641c1bdecad7a128b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/LogoiLab/fuc
[INFO] finished tweaking git repo https://github.com/LogoiLab/fuc
[INFO] tweaked toml for git repo https://github.com/LogoiLab/fuc written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/LogoiLab/fuc already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded lz4-sys v1.8.3
[INFO] [stderr]   Downloaded lz4 v1.23.1
[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" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2b03422fbc65f6cc8e848de407711ae8b8f6c65096b39853cfc8a8ce0e0237d7
[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" "2b03422fbc65f6cc8e848de407711ae8b8f6c65096b39853cfc8a8ce0e0237d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2b03422fbc65f6cc8e848de407711ae8b8f6c65096b39853cfc8a8ce0e0237d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b03422fbc65f6cc8e848de407711ae8b8f6c65096b39853cfc8a8ce0e0237d7", kill_on_drop: false }`
[INFO] [stdout] 2b03422fbc65f6cc8e848de407711ae8b8f6c65096b39853cfc8a8ce0e0237d7
[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" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bd04f5e4c26cb0b5cc9722bc1340442a07241a4ee5683b63b0486658db2e7b49
[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" "bd04f5e4c26cb0b5cc9722bc1340442a07241a4ee5683b63b0486658db2e7b49", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.48
[INFO] [stderr]    Compiling proc-macro2 v0.4.27
[INFO] [stderr]    Compiling serde v1.0.87
[INFO] [stderr]    Compiling autocfg v0.1.2
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling ryu v0.2.7
[INFO] [stderr]    Compiling cfg-if v0.1.6
[INFO] [stderr]    Compiling rustc-demangle v0.1.13
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling pulldown-cmark v0.2.0
[INFO] [stderr]    Compiling itoa v0.4.3
[INFO] [stderr]    Compiling same-file v1.0.4
[INFO] [stderr]    Compiling remove_dir_all v0.5.1
[INFO] [stderr]    Compiling bitflags v1.0.4
[INFO] [stderr]    Compiling bytecount v0.4.0
[INFO] [stderr]    Compiling lz4-sys v1.8.3
[INFO] [stderr]    Compiling walkdir v2.2.7
[INFO] [stderr]    Compiling backtrace v0.3.13
[INFO] [stderr]    Compiling quote v0.6.11
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling syn v0.15.26
[INFO] [stderr]    Compiling error-chain v0.12.0
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]    Compiling serde_derive v1.0.87
[INFO] [stderr]    Compiling serde_json v1.0.38
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling cargo_metadata v0.6.4
[INFO] [stderr]    Compiling skeptic v0.13.4
[INFO] [stderr]    Compiling lz4 v1.23.1
[INFO] [stderr]    Compiling fuc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `fuc::block::Block`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use fuc::block::Block;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/fuc/block.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 48 |         unimplemented!();
[INFO] [stdout]    |         ----------------- any code following this expression is unreachable
[INFO] [stdout] 49 |         self.dirty = false;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/fuc/descriptor.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |         unimplemented!();
[INFO] [stdout]    |         ----------------- any code following this expression is unreachable
[INFO] [stdout] 61 |         self.dirty = false;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/fuc/fat.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         unimplemented!();
[INFO] [stdout]    |         ----------------- any code following this expression is unreachable
[INFO] [stdout] 28 |         self.dirty = false;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/fuc/file.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         unimplemented!();
[INFO] [stdout]    |         ----------------- any code following this expression is unreachable
[INFO] [stdout] 14 |         self.dirty = false;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/fuc/volume.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |         unimplemented!();
[INFO] [stdout]    |         ----------------- any code following this expression is unreachable
[INFO] [stdout] 19 |         self.dirty = false;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `writer`
[INFO] [stdout]   --> src/fuc/block.rs:47:29
[INFO] [stdout]    |
[INFO] [stdout] 47 |     pub fn write(&mut self, writer: Writer) -> Writer {
[INFO] [stdout]    |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `writer`
[INFO] [stdout]   --> src/fuc/descriptor.rs:59:29
[INFO] [stdout]    |
[INFO] [stdout] 59 |     pub fn write(&mut self, writer: Writer) -> Writer {
[INFO] [stdout]    |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `writer`
[INFO] [stdout]   --> src/fuc/fat.rs:26:29
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub fn write(&mut self, writer: Writer) -> Writer {
[INFO] [stdout]    |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `writer`
[INFO] [stdout]   --> src/fuc/file.rs:12:29
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn write(&mut self, writer: Writer) -> Writer {
[INFO] [stdout]    |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `writer`
[INFO] [stdout]   --> src/fuc/volume.rs:17:29
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub fn write(&mut self, writer: Writer) -> Writer {
[INFO] [stdout]    |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `data`
[INFO] [stdout]  --> src/fuc/block.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     data: [u8; BLOCK_LENGTH],
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `offset`
[INFO] [stdout]   --> src/fuc/block.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     offset: usize,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `fdesc`
[INFO] [stdout]  --> src/fuc/fat.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fdesc: Vec<FileDescriptor>,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `desc`
[INFO] [stdout]  --> src/fuc/file.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     desc: FileDescriptor,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `blocks`
[INFO] [stdout]  --> src/fuc/file.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     blocks: Vec<Block>,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `magic`
[INFO] [stdout]   --> src/fuc/volume.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     magic: [u8; MAGIC_LENGTH],
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `fat`
[INFO] [stdout]   --> src/fuc/volume.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fat: FileAllocationTable,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `files`
[INFO] [stdout]   --> src/fuc/volume.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     files: Vec<File>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `dirty`
[INFO] [stdout]   --> src/fuc/volume.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     dirty: bool
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 21.43s
[INFO] running `Command { std: "docker" "inspect" "bd04f5e4c26cb0b5cc9722bc1340442a07241a4ee5683b63b0486658db2e7b49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd04f5e4c26cb0b5cc9722bc1340442a07241a4ee5683b63b0486658db2e7b49", kill_on_drop: false }`
[INFO] [stdout] bd04f5e4c26cb0b5cc9722bc1340442a07241a4ee5683b63b0486658db2e7b49
[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" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 3743a764dcc1c794ad4a8df6ac1edb4922d472506a3f08e385c81f98994d6fcb
[INFO] running `Command { std: "docker" "start" "-a" "3743a764dcc1c794ad4a8df6ac1edb4922d472506a3f08e385c81f98994d6fcb", kill_on_drop: false }`
[INFO] [stderr]    Compiling fuc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `fuc::block::Block`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use fuc::block::Block;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/fuc/block.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 48 |         unimplemented!();
[INFO] [stdout]    |         ----------------- any code following this expression is unreachable
[INFO] [stdout] 49 |         self.dirty = false;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/fuc/descriptor.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |         unimplemented!();
[INFO] [stdout]    |         ----------------- any code following this expression is unreachable
[INFO] [stdout] 61 |         self.dirty = false;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/fuc/fat.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         unimplemented!();
[INFO] [stdout]    |         ----------------- any code following this expression is unreachable
[INFO] [stdout] 28 |         self.dirty = false;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/fuc/file.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         unimplemented!();
[INFO] [stdout]    |         ----------------- any code following this expression is unreachable
[INFO] [stdout] 14 |         self.dirty = false;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/fuc/volume.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |         unimplemented!();
[INFO] [stdout]    |         ----------------- any code following this expression is unreachable
[INFO] [stdout] 19 |         self.dirty = false;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `writer`
[INFO] [stdout]   --> src/fuc/block.rs:47:29
[INFO] [stdout]    |
[INFO] [stdout] 47 |     pub fn write(&mut self, writer: Writer) -> Writer {
[INFO] [stdout]    |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `writer`
[INFO] [stdout]   --> src/fuc/descriptor.rs:59:29
[INFO] [stdout]    |
[INFO] [stdout] 59 |     pub fn write(&mut self, writer: Writer) -> Writer {
[INFO] [stdout]    |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `writer`
[INFO] [stdout]   --> src/fuc/fat.rs:26:29
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub fn write(&mut self, writer: Writer) -> Writer {
[INFO] [stdout]    |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `writer`
[INFO] [stdout]   --> src/fuc/file.rs:12:29
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn write(&mut self, writer: Writer) -> Writer {
[INFO] [stdout]    |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `writer`
[INFO] [stdout]   --> src/fuc/volume.rs:17:29
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub fn write(&mut self, writer: Writer) -> Writer {
[INFO] [stdout]    |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `data`
[INFO] [stdout]  --> src/fuc/block.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     data: [u8; BLOCK_LENGTH],
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `offset`
[INFO] [stdout]   --> src/fuc/block.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     offset: usize,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `fdesc`
[INFO] [stdout]  --> src/fuc/fat.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fdesc: Vec<FileDescriptor>,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `desc`
[INFO] [stdout]  --> src/fuc/file.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     desc: FileDescriptor,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `blocks`
[INFO] [stdout]  --> src/fuc/file.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     blocks: Vec<Block>,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `magic`
[INFO] [stdout]   --> src/fuc/volume.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     magic: [u8; MAGIC_LENGTH],
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `fat`
[INFO] [stdout]   --> src/fuc/volume.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fat: FileAllocationTable,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `files`
[INFO] [stdout]   --> src/fuc/volume.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     files: Vec<File>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `dirty`
[INFO] [stdout]   --> src/fuc/volume.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     dirty: bool
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.52s
[INFO] running `Command { std: "docker" "inspect" "3743a764dcc1c794ad4a8df6ac1edb4922d472506a3f08e385c81f98994d6fcb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3743a764dcc1c794ad4a8df6ac1edb4922d472506a3f08e385c81f98994d6fcb", kill_on_drop: false }`
[INFO] [stdout] 3743a764dcc1c794ad4a8df6ac1edb4922d472506a3f08e385c81f98994d6fcb
[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" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 67c0e142c1c3fdaedeb217cc0caf6a5fe5d7f70729fa0797ea259c6f3da74f49
[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" "67c0e142c1c3fdaedeb217cc0caf6a5fe5d7f70729fa0797ea259c6f3da74f49", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: unused import: `fuc::block::Block`
[INFO] [stdout] running 0 tests
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stdout] 
[INFO] [stderr]   |
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr] 5 | use fuc::block::Block;
[INFO] [stdout] 
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]   --> src/fuc/block.rs:49:9
[INFO] [stderr]    |
[INFO] [stderr] 48 |         unimplemented!();
[INFO] [stderr]    |         ----------------- any code following this expression is unreachable
[INFO] [stderr] 49 |         self.dirty = false;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]   --> src/fuc/descriptor.rs:61:9
[INFO] [stderr]    |
[INFO] [stderr] 60 |         unimplemented!();
[INFO] [stderr]    |         ----------------- any code following this expression is unreachable
[INFO] [stderr] 61 |         self.dirty = false;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]   --> src/fuc/fat.rs:28:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |         unimplemented!();
[INFO] [stderr]    |         ----------------- any code following this expression is unreachable
[INFO] [stderr] 28 |         self.dirty = false;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]   --> src/fuc/file.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |         unimplemented!();
[INFO] [stderr]    |         ----------------- any code following this expression is unreachable
[INFO] [stderr] 14 |         self.dirty = false;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]   --> src/fuc/volume.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |         unimplemented!();
[INFO] [stderr]    |         ----------------- any code following this expression is unreachable
[INFO] [stderr] 19 |         self.dirty = false;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `writer`
[INFO] [stderr]   --> src/fuc/block.rs:47:29
[INFO] [stderr]    |
[INFO] [stderr] 47 |     pub fn write(&mut self, writer: Writer) -> Writer {
[INFO] [stderr]    |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `writer`
[INFO] [stderr]   --> src/fuc/descriptor.rs:59:29
[INFO] [stderr]    |
[INFO] [stderr] 59 |     pub fn write(&mut self, writer: Writer) -> Writer {
[INFO] [stderr]    |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `writer`
[INFO] [stderr]   --> src/fuc/fat.rs:26:29
[INFO] [stderr]    |
[INFO] [stderr] 26 |     pub fn write(&mut self, writer: Writer) -> Writer {
[INFO] [stderr]    |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `writer`
[INFO] [stderr]   --> src/fuc/file.rs:12:29
[INFO] [stderr]    |
[INFO] [stderr] 12 |     pub fn write(&mut self, writer: Writer) -> Writer {
[INFO] [stderr]    |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `writer`
[INFO] [stderr]   --> src/fuc/volume.rs:17:29
[INFO] [stderr]    |
[INFO] [stderr] 17 |     pub fn write(&mut self, writer: Writer) -> Writer {
[INFO] [stderr]    |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `data`
[INFO] [stderr]  --> src/fuc/block.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     data: [u8; BLOCK_LENGTH],
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `offset`
[INFO] [stderr]   --> src/fuc/block.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     offset: usize,
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `fdesc`
[INFO] [stderr]  --> src/fuc/fat.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     fdesc: Vec<FileDescriptor>,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `desc`
[INFO] [stderr]  --> src/fuc/file.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 |     desc: FileDescriptor,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `blocks`
[INFO] [stderr]  --> src/fuc/file.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     blocks: Vec<Block>,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `magic`
[INFO] [stderr]   --> src/fuc/volume.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     magic: [u8; MAGIC_LENGTH],
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `fat`
[INFO] [stderr]   --> src/fuc/volume.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     fat: FileAllocationTable,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `files`
[INFO] [stderr]   --> src/fuc/volume.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     files: Vec<File>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `dirty`
[INFO] [stderr]   --> src/fuc/volume.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     dirty: bool
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 20 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/fuc-3c0fcf85aa1ce9f7)
[INFO] running `Command { std: "docker" "inspect" "67c0e142c1c3fdaedeb217cc0caf6a5fe5d7f70729fa0797ea259c6f3da74f49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "67c0e142c1c3fdaedeb217cc0caf6a5fe5d7f70729fa0797ea259c6f3da74f49", kill_on_drop: false }`
[INFO] [stdout] 67c0e142c1c3fdaedeb217cc0caf6a5fe5d7f70729fa0797ea259c6f3da74f49