[INFO] cloning 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" "clone" "--bare" "https://github.com/sagaban/rust-by-example" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsagaban%2Frust-by-example", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsagaban%2Frust-by-example'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2d7f259cdc0f6ca066acfa22d49b7a66667afd24
[INFO] testing sagaban/rust-by-example against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsagaban%2Frust-by-example" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sagaban/rust-by-example on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", 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-5/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" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 69e537cb5dbf1b7378a4c7c8b31995b8896a5a87fca5e87dea0b4db4880c43c0
[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" "69e537cb5dbf1b7378a4c7c8b31995b8896a5a87fca5e87dea0b4db4880c43c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "69e537cb5dbf1b7378a4c7c8b31995b8896a5a87fca5e87dea0b4db4880c43c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69e537cb5dbf1b7378a4c7c8b31995b8896a5a87fca5e87dea0b4db4880c43c0", kill_on_drop: false }`
[INFO] [stdout] 69e537cb5dbf1b7378a4c7c8b31995b8896a5a87fca5e87dea0b4db4880c43c0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--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] 1e6f5cf963ecfd8d6e41abf3f3a0c872c320c380f734af4520c6580bc17893e4
[INFO] running `Command { std: "docker" "start" "-a" "1e6f5cf963ecfd8d6e41abf3f3a0c872c320c380f734af4520c6580bc17893e4", 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:35:7
[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:39:7
[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: 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: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.41s
[INFO] running `Command { std: "docker" "inspect" "1e6f5cf963ecfd8d6e41abf3f3a0c872c320c380f734af4520c6580bc17893e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e6f5cf963ecfd8d6e41abf3f3a0c872c320c380f734af4520c6580bc17893e4", kill_on_drop: false }`
[INFO] [stdout] 1e6f5cf963ecfd8d6e41abf3f3a0c872c320c380f734af4520c6580bc17893e4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c894e02550514c1f1380aa316c1114c6c1c038cdd94f19afdc62dbf6f2a2f284
[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" "c894e02550514c1f1380aa316c1114c6c1c038cdd94f19afdc62dbf6f2a2f284", 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:35:7
[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:39:7
[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: 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: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.94s
[INFO] running `Command { std: "docker" "inspect" "c894e02550514c1f1380aa316c1114c6c1c038cdd94f19afdc62dbf6f2a2f284", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c894e02550514c1f1380aa316c1114c6c1c038cdd94f19afdc62dbf6f2a2f284", kill_on_drop: false }`
[INFO] [stdout] c894e02550514c1f1380aa316c1114c6c1c038cdd94f19afdc62dbf6f2a2f284
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 9c35c7a84b8242e819db77e93f372fdfbdf9016dbefa752c8abfd9af670b480d
[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" "9c35c7a84b8242e819db77e93f372fdfbdf9016dbefa752c8abfd9af670b480d", 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:35:7
[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:39:7
[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: 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: 11 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/rust_by_example-520e79b680f963be
[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
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "9c35c7a84b8242e819db77e93f372fdfbdf9016dbefa752c8abfd9af670b480d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9c35c7a84b8242e819db77e93f372fdfbdf9016dbefa752c8abfd9af670b480d", kill_on_drop: false }`
[INFO] [stdout] 9c35c7a84b8242e819db77e93f372fdfbdf9016dbefa752c8abfd9af670b480d