[INFO] updating cached repository https://github.com/sagaban/rust-by-example
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2d7f259cdc0f6ca066acfa22d49b7a66667afd24
[INFO] testing sagaban/rust-by-example against try#8262275854dc0e5381c9d42d56257d94932c5a87 for pr-90799
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsagaban%2Frust-by-example" "/workspace/builds/worker-81/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-81/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sagaban/rust-by-example on toolchain 8262275854dc0e5381c9d42d56257d94932c5a87
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/sagaban/rust-by-example
[INFO] finished tweaking git repo https://github.com/sagaban/rust-by-example
[INFO] tweaked toml for git repo https://github.com/sagaban/rust-by-example written to /workspace/builds/worker-81/source/Cargo.toml
[INFO] crate git repo https://github.com/sagaban/rust-by-example already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "fetch" "--manifest-path" "Cargo.toml", 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9b8e0bab96e67c8a97a083dd675923f13c9dfdb712f6b9f4da1e6d6d45bdf085
[INFO] running `Command { std: "docker" "start" "-a" "9b8e0bab96e67c8a97a083dd675923f13c9dfdb712f6b9f4da1e6d6d45bdf085", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9b8e0bab96e67c8a97a083dd675923f13c9dfdb712f6b9f4da1e6d6d45bdf085", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9b8e0bab96e67c8a97a083dd675923f13c9dfdb712f6b9f4da1e6d6d45bdf085", kill_on_drop: false }`
[INFO] [stdout] 9b8e0bab96e67c8a97a083dd675923f13c9dfdb712f6b9f4da1e6d6d45bdf085
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9cfa74243237b4a3c91e59ba08e6269725099d4a7fff50ce1e45e8935507665b
[INFO] running `Command { std: "docker" "start" "-a" "9cfa74243237b4a3c91e59ba08e6269725099d4a7fff50ce1e45e8935507665b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling rust-by-example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `logical`
[INFO] [stdout]   --> src/chapters/c02.rs:25:7
[INFO] [stdout]    |
[INFO] [stdout] 25 |   let logical: bool = true;
[INFO] [stdout]    |       ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_logical`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a_float`
[INFO] [stdout]   --> src/chapters/c02.rs:27:7
[INFO] [stdout]    |
[INFO] [stdout] 27 |   let a_float: f64 = 1.0; // Regular annotation
[INFO] [stdout]    |       ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_a_float`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `an_integer`
[INFO] [stdout]   --> src/chapters/c02.rs:28:7
[INFO] [stdout]    |
[INFO] [stdout] 28 |   let an_integer = 5i32; // Suffix annotation
[INFO] [stdout]    |       ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_an_integer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `default_float`
[INFO] [stdout]   --> src/chapters/c02.rs:31:7
[INFO] [stdout]    |
[INFO] [stdout] 31 |   let default_float = 3.0; // `f64`
[INFO] [stdout]    |       ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_default_float`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `default_integer`
[INFO] [stdout]   --> src/chapters/c02.rs:32:7
[INFO] [stdout]    |
[INFO] [stdout] 32 |   let default_integer = 7; // `i32`
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_default_integer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `inferred_type` is assigned to, but never used
[INFO] [stdout]   --> src/chapters/c02.rs:35:11
[INFO] [stdout]    |
[INFO] [stdout] 35 |   let mut inferred_type = 12; // Type i64 is inferred from another line
[INFO] [stdout]    |           ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_inferred_type` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `inferred_type` is never read
[INFO] [stdout]   --> src/chapters/c02.rs:36:3
[INFO] [stdout]    |
[INFO] [stdout] 36 |   inferred_type = 4294967296i64;
[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 `mutable` is assigned to, but never used
[INFO] [stdout]   --> src/chapters/c02.rs:39:11
[INFO] [stdout]    |
[INFO] [stdout] 39 |   let mut mutable = 12; // Mutable `i32`
[INFO] [stdout]    |           ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_mutable` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `mutable` is never read
[INFO] [stdout]   --> src/chapters/c02.rs:40:3
[INFO] [stdout]    |
[INFO] [stdout] 40 |   mutable = 21;
[INFO] [stdout]    |   ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mutable`
[INFO] [stdout]   --> src/chapters/c02.rs:46:7
[INFO] [stdout]    |
[INFO] [stdout] 46 |   let mutable = true;
[INFO] [stdout]    |       ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mutable`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]   --> src/chapters/c03.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     name: &'a str,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `age`
[INFO] [stdout]   --> src/chapters/c03.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     age: u8,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Subtract`
[INFO] [stdout]    --> src/chapters/c03.rs:220:5
[INFO] [stdout]     |
[INFO] [stdout] 220 |     Subtract,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `c_liKe_enums` should have a snake case name
[INFO] [stdout]    --> src/chapters/c03.rs:281:8
[INFO] [stdout]     |
[INFO] [stdout] 281 | pub fn c_liKe_enums() {
[INFO] [stdout]     |        ^^^^^^^^^^^^ help: convert the identifier to snake case: `c_li_ke_enums`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 14 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.53s
[INFO] running `Command { std: "docker" "inspect" "9cfa74243237b4a3c91e59ba08e6269725099d4a7fff50ce1e45e8935507665b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9cfa74243237b4a3c91e59ba08e6269725099d4a7fff50ce1e45e8935507665b", kill_on_drop: false }`
[INFO] [stdout] 9cfa74243237b4a3c91e59ba08e6269725099d4a7fff50ce1e45e8935507665b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 57525852776fb3e905d20be358d08828e716beaf099077b4b9473391d57f48a2
[INFO] running `Command { std: "docker" "start" "-a" "57525852776fb3e905d20be358d08828e716beaf099077b4b9473391d57f48a2", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-by-example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `logical`
[INFO] [stdout]   --> src/chapters/c02.rs:25:7
[INFO] [stdout]    |
[INFO] [stdout] 25 |   let logical: bool = true;
[INFO] [stdout]    |       ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_logical`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a_float`
[INFO] [stdout]   --> src/chapters/c02.rs:27:7
[INFO] [stdout]    |
[INFO] [stdout] 27 |   let a_float: f64 = 1.0; // Regular annotation
[INFO] [stdout]    |       ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_a_float`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `an_integer`
[INFO] [stdout]   --> src/chapters/c02.rs:28:7
[INFO] [stdout]    |
[INFO] [stdout] 28 |   let an_integer = 5i32; // Suffix annotation
[INFO] [stdout]    |       ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_an_integer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `default_float`
[INFO] [stdout]   --> src/chapters/c02.rs:31:7
[INFO] [stdout]    |
[INFO] [stdout] 31 |   let default_float = 3.0; // `f64`
[INFO] [stdout]    |       ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_default_float`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `default_integer`
[INFO] [stdout]   --> src/chapters/c02.rs:32:7
[INFO] [stdout]    |
[INFO] [stdout] 32 |   let default_integer = 7; // `i32`
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_default_integer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `inferred_type` is assigned to, but never used
[INFO] [stdout]   --> src/chapters/c02.rs:35:11
[INFO] [stdout]    |
[INFO] [stdout] 35 |   let mut inferred_type = 12; // Type i64 is inferred from another line
[INFO] [stdout]    |           ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_inferred_type` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `inferred_type` is never read
[INFO] [stdout]   --> src/chapters/c02.rs:36:3
[INFO] [stdout]    |
[INFO] [stdout] 36 |   inferred_type = 4294967296i64;
[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 `mutable` is assigned to, but never used
[INFO] [stdout]   --> src/chapters/c02.rs:39:11
[INFO] [stdout]    |
[INFO] [stdout] 39 |   let mut mutable = 12; // Mutable `i32`
[INFO] [stdout]    |           ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_mutable` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `mutable` is never read
[INFO] [stdout]   --> src/chapters/c02.rs:40:3
[INFO] [stdout]    |
[INFO] [stdout] 40 |   mutable = 21;
[INFO] [stdout]    |   ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mutable`
[INFO] [stdout]   --> src/chapters/c02.rs:46:7
[INFO] [stdout]    |
[INFO] [stdout] 46 |   let mutable = true;
[INFO] [stdout]    |       ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mutable`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]   --> src/chapters/c03.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     name: &'a str,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `age`
[INFO] [stdout]   --> src/chapters/c03.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     age: u8,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Subtract`
[INFO] [stdout]    --> src/chapters/c03.rs:220:5
[INFO] [stdout]     |
[INFO] [stdout] 220 |     Subtract,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `c_liKe_enums` should have a snake case name
[INFO] [stdout]    --> src/chapters/c03.rs:281:8
[INFO] [stdout]     |
[INFO] [stdout] 281 | pub fn c_liKe_enums() {
[INFO] [stdout]     |        ^^^^^^^^^^^^ help: convert the identifier to snake case: `c_li_ke_enums`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 14 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.55s
[INFO] running `Command { std: "docker" "inspect" "57525852776fb3e905d20be358d08828e716beaf099077b4b9473391d57f48a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57525852776fb3e905d20be358d08828e716beaf099077b4b9473391d57f48a2", kill_on_drop: false }`
[INFO] [stdout] 57525852776fb3e905d20be358d08828e716beaf099077b4b9473391d57f48a2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 7547f229f960022f35af3d6ea8d2dd2d6dfaab7caed05b0d281ff738a8a111ec
[INFO] running `Command { std: "docker" "start" "-a" "7547f229f960022f35af3d6ea8d2dd2d6dfaab7caed05b0d281ff738a8a111ec", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `logical`
[INFO] [stderr]   --> src/chapters/c02.rs:25:7
[INFO] [stderr]    |
[INFO] [stderr] 25 |   let logical: bool = true;
[INFO] [stderr]    |       ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_logical`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a_float`
[INFO] [stderr]   --> src/chapters/c02.rs:27:7
[INFO] [stderr]    |
[INFO] [stderr] 27 |   let a_float: f64 = 1.0; // Regular annotation
[INFO] [stderr]    |       ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_a_float`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `an_integer`
[INFO] [stderr]   --> src/chapters/c02.rs:28:7
[INFO] [stderr]    |
[INFO] [stderr] 28 |   let an_integer = 5i32; // Suffix annotation
[INFO] [stderr]    |       ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_an_integer`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `default_float`
[INFO] [stderr]   --> src/chapters/c02.rs:31:7
[INFO] [stderr]    |
[INFO] [stderr] 31 |   let default_float = 3.0; // `f64`
[INFO] [stderr]    |       ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_default_float`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `default_integer`
[INFO] [stderr]   --> src/chapters/c02.rs:32:7
[INFO] [stderr]    |
[INFO] [stderr] 32 |   let default_integer = 7; // `i32`
[INFO] [stderr]    |       ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_default_integer`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `inferred_type` is assigned to, but never used
[INFO] [stderr]   --> src/chapters/c02.rs:35:11
[INFO] [stderr]    |
[INFO] [stderr] 35 |   let mut inferred_type = 12; // Type i64 is inferred from another line
[INFO] [stderr]    |           ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_inferred_type` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `inferred_type` is never read
[INFO] [stderr]   --> src/chapters/c02.rs:36:3
[INFO] [stderr]    |
[INFO] [stderr] 36 |   inferred_type = 4294967296i64;
[INFO] [stderr]    |   ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `mutable` is assigned to, but never used
[INFO] [stderr]   --> src/chapters/c02.rs:39:11
[INFO] [stderr]    |
[INFO] [stderr] 39 |   let mut mutable = 12; // Mutable `i32`
[INFO] [stderr]    |           ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_mutable` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `mutable` is never read
[INFO] [stderr]   --> src/chapters/c02.rs:40:3
[INFO] [stderr]    |
[INFO] [stderr] 40 |   mutable = 21;
[INFO] [stderr]    |   ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `mutable`
[INFO] [stderr]   --> src/chapters/c02.rs:46:7
[INFO] [stderr]    |
[INFO] [stderr] 46 |   let mutable = true;
[INFO] [stderr]    |       ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mutable`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `name`
[INFO] [stderr]   --> src/chapters/c03.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     name: &'a str,
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `age`
[INFO] [stderr]   --> src/chapters/c03.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 |     age: u8,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Subtract`
[INFO] [stderr]    --> src/chapters/c03.rs:220:5
[INFO] [stderr]     |
[INFO] [stderr] 220 |     Subtract,
[INFO] [stderr]     |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `c_liKe_enums` should have a snake case name
[INFO] [stderr]    --> src/chapters/c03.rs:281:8
[INFO] [stderr]     |
[INFO] [stderr] 281 | pub fn c_liKe_enums() {
[INFO] [stderr]     |        ^^^^^^^^^^^^ help: convert the identifier to snake case: `c_li_ke_enums`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-by-example` (bin "rust-by-example" test) generated 14 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_by_example-4e2b83d4719a65c4)
[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" "7547f229f960022f35af3d6ea8d2dd2d6dfaab7caed05b0d281ff738a8a111ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7547f229f960022f35af3d6ea8d2dd2d6dfaab7caed05b0d281ff738a8a111ec", kill_on_drop: false }`
[INFO] [stdout] 7547f229f960022f35af3d6ea8d2dd2d6dfaab7caed05b0d281ff738a8a111ec