[INFO] cloning repository https://github.com/vijaykm2/RustByExample
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vijaykm2/RustByExample" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 1)
[INFO] cloning repository https://github.com/vijaykm2/RustByExample
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vijaykm2/RustByExample" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 2)
[INFO] cloning repository https://github.com/vijaykm2/RustByExample
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vijaykm2/RustByExample" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 3)
[INFO] cloning repository https://github.com/vijaykm2/RustByExample
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vijaykm2/RustByExample" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 4)
[INFO] cloning repository https://github.com/vijaykm2/RustByExample
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vijaykm2/RustByExample" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 5)
[INFO] cloning repository https://github.com/vijaykm2/RustByExample
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vijaykm2/RustByExample" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 6)
[INFO] cloning repository https://github.com/vijaykm2/RustByExample
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vijaykm2/RustByExample" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 7)
[INFO] cloning repository https://github.com/vijaykm2/RustByExample
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vijaykm2/RustByExample" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 8)
[INFO] cloning repository https://github.com/vijaykm2/RustByExample
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vijaykm2/RustByExample" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a000cf1967a595c64472ed3633febaea7911476d
[INFO] checking vijaykm2/RustByExample against master#fce0e74720d199eb7839fdb51af35ac5226da178 for pr-145262
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvijaykm2%2FRustByExample" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/vijaykm2/RustByExample
[INFO] finished tweaking git repo https://github.com/vijaykm2/RustByExample
[INFO] tweaked toml for git repo https://github.com/vijaykm2/RustByExample written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/vijaykm2/RustByExample on toolchain fce0e74720d199eb7839fdb51af35ac5226da178
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+fce0e74720d199eb7839fdb51af35ac5226da178" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/vijaykm2/RustByExample already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+fce0e74720d199eb7839fdb51af35ac5226da178" "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-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+fce0e74720d199eb7839fdb51af35ac5226da178" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 155bbc5a89a75c32a7b7a1ae8fd19933ac78b9eb1b4e7982ad12db102a11a4a3
[INFO] running `Command { std: "docker" "start" "-a" "155bbc5a89a75c32a7b7a1ae8fd19933ac78b9eb1b4e7982ad12db102a11a4a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "155bbc5a89a75c32a7b7a1ae8fd19933ac78b9eb1b4e7982ad12db102a11a4a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "155bbc5a89a75c32a7b7a1ae8fd19933ac78b9eb1b4e7982ad12db102a11a4a3", kill_on_drop: false }`
[INFO] [stdout] 155bbc5a89a75c32a7b7a1ae8fd19933ac78b9eb1b4e7982ad12db102a11a4a3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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" "RUSTDOCFLAGS=--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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+fce0e74720d199eb7839fdb51af35ac5226da178" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e26e16d68311cdd2b848cbc51d3a1755225b75590cda0c3838691a25cff1d511
[INFO] running `Command { std: "docker" "start" "-a" "e26e16d68311cdd2b848cbc51d3a1755225b75590cda0c3838691a25cff1d511", kill_on_drop: false }`
[INFO] [stderr]     Checking RustByExample v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `crate::ch2::primitives`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::ch2::primitives;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::custom_types::Status::Poor`
[INFO] [stdout]  --> src/ch3/custom_types.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     use crate::custom_types::Status::Poor;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::custom_types::Work::Civilian`
[INFO] [stdout]  --> src/ch3/custom_types.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     use crate::custom_types::Work::Civilian;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `u64_t` should have an upper camel case name
[INFO] [stdout]   --> src/ch5/types.rs:60:14
[INFO] [stdout]    |
[INFO] [stdout] 60 |         type u64_t = u64;
[INFO] [stdout]    |              ^^^^^ help: convert the identifier to upper camel case: `U64T`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]   --> src/ch8/flow_control.rs:39:13
[INFO] [stdout]    |
[INFO] [stdout] 39 |             'inner: loop {
[INFO] [stdout]    |             ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::ch2::primitives`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::ch2::primitives;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::custom_types::Status::Poor`
[INFO] [stdout]  --> src/ch3/custom_types.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     use crate::custom_types::Status::Poor;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::custom_types::Work::Civilian`
[INFO] [stdout]  --> src/ch3/custom_types.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     use crate::custom_types::Work::Civilian;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `u64_t` should have an upper camel case name
[INFO] [stdout]   --> src/ch5/types.rs:60:14
[INFO] [stdout]    |
[INFO] [stdout] 60 |         type u64_t = u64;
[INFO] [stdout]    |              ^^^^^ help: convert the identifier to upper camel case: `U64T`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]   --> src/ch8/flow_control.rs:39:13
[INFO] [stdout]    |
[INFO] [stdout] 39 |             'inner: loop {
[INFO] [stdout]    |             ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/ch8/flow_control.rs:43:13
[INFO] [stdout]    |
[INFO] [stdout] 41 |                 break 'outer;
[INFO] [stdout]    |                 ------------ any code following this expression is unreachable
[INFO] [stdout] 42 |             }
[INFO] [stdout] 43 |             println!("This is not reached");
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `inferred_type` is assigned to, but never used
[INFO] [stdout]   --> src/ch2/primitives.rs:10:17
[INFO] [stdout]    |
[INFO] [stdout] 10 |         let mut inferred_type = 123;
[INFO] [stdout]    |                 ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_inferred_type` instead
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `inferred_type` is never read
[INFO] [stdout]   --> src/ch2/primitives.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |         inferred_type = 123123123123123i64;
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `mutable` is assigned to, but never used
[INFO] [stdout]   --> src/ch2/primitives.rs:12:17
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let mut mutable = 23;
[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/ch2/primitives.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         mutable = 32;
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/ch8/flow_control.rs:43:13
[INFO] [stdout]    |
[INFO] [stdout] 41 |                 break 'outer;
[INFO] [stdout]    |                 ------------ any code following this expression is unreachable
[INFO] [stdout] 42 |             }
[INFO] [stdout] 43 |             println!("This is not reached");
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `a_binding` is assigned to, but never used
[INFO] [stdout]   --> src/ch4/variable_bindings.rs:37:13
[INFO] [stdout]    |
[INFO] [stdout] 37 |         let a_binding;
[INFO] [stdout]    |             ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_a_binding` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `a_binding` is never read
[INFO] [stdout]   --> src/ch4/variable_bindings.rs:40:13
[INFO] [stdout]    |
[INFO] [stdout] 40 |             a_binding = x * x;
[INFO] [stdout]    |             ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mut_int`
[INFO] [stdout]   --> src/ch4/variable_bindings.rs:53:17
[INFO] [stdout]    |
[INFO] [stdout] 53 |             let mut_int = mut_int;
[INFO] [stdout]    |                 ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mut_int`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `mut_int` is never read
[INFO] [stdout]   --> src/ch4/variable_bindings.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |         mut_int = 231
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `inferred_type` is assigned to, but never used
[INFO] [stdout]   --> src/ch2/primitives.rs:10:17
[INFO] [stdout]    |
[INFO] [stdout] 10 |         let mut inferred_type = 123;
[INFO] [stdout]    |                 ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_inferred_type` instead
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `inferred_type` is never read
[INFO] [stdout]   --> src/ch2/primitives.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |         inferred_type = 123123123123123i64;
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `mutable` is assigned to, but never used
[INFO] [stdout]   --> src/ch2/primitives.rs:12:17
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let mut mutable = 23;
[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/ch2/primitives.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         mutable = 32;
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `a_binding` is assigned to, but never used
[INFO] [stdout]   --> src/ch4/variable_bindings.rs:37:13
[INFO] [stdout]    |
[INFO] [stdout] 37 |         let a_binding;
[INFO] [stdout]    |             ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_a_binding` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `a_binding` is never read
[INFO] [stdout]   --> src/ch4/variable_bindings.rs:40:13
[INFO] [stdout]    |
[INFO] [stdout] 40 |             a_binding = x * x;
[INFO] [stdout]    |             ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mut_int`
[INFO] [stdout]   --> src/ch4/variable_bindings.rs:53:17
[INFO] [stdout]    |
[INFO] [stdout] 53 |             let mut_int = mut_int;
[INFO] [stdout]    |                 ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mut_int`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `mut_int` is never read
[INFO] [stdout]   --> src/ch4/variable_bindings.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |         mut_int = 231
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `age` are never read
[INFO] [stdout]   --> src/ch3/custom_types.rs:9:9
[INFO] [stdout]    |
[INFO] [stdout]  8 |     struct Person<'a> {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout]  9 |         name: &'a str,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 10 |         age: u8,
[INFO] [stdout]    |         ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Person` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Rich` is never constructed
[INFO] [stdout]   --> src/ch3/custom_types.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 72 |     Status{
[INFO] [stdout]    |     ------ variant in this enum
[INFO] [stdout] 73 |         Rich, Poor
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Soldier` is never constructed
[INFO] [stdout]   --> src/ch3/custom_types.rs:76:19
[INFO] [stdout]    |
[INFO] [stdout] 75 |     enum Work {
[INFO] [stdout]    |          ---- variant in this enum
[INFO] [stdout] 76 |         Civilian, Soldier
[INFO] [stdout]    |                   ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `age` are never read
[INFO] [stdout]   --> src/ch3/custom_types.rs:9:9
[INFO] [stdout]    |
[INFO] [stdout]  8 |     struct Person<'a> {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout]  9 |         name: &'a str,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 10 |         age: u8,
[INFO] [stdout]    |         ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Person` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]   --> src/ch6/conversion.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout]  9 |     struct Number {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 10 |         value: i32
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Number` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Rich` is never constructed
[INFO] [stdout]   --> src/ch3/custom_types.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 72 |     Status{
[INFO] [stdout]    |     ------ variant in this enum
[INFO] [stdout] 73 |         Rich, Poor
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Soldier` is never constructed
[INFO] [stdout]   --> src/ch3/custom_types.rs:76:19
[INFO] [stdout]    |
[INFO] [stdout] 75 |     enum Work {
[INFO] [stdout]    |          ---- variant in this enum
[INFO] [stdout] 76 |         Civilian, Soldier
[INFO] [stdout]    |                   ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple variants are never constructed
[INFO] [stdout]    --> src/ch8/flow_control.rs:130:9
[INFO] [stdout]     |
[INFO] [stdout] 129 |     enum Color {
[INFO] [stdout]     |          ----- variants in this enum
[INFO] [stdout] 130 |         RED,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 131 |         BLUE,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 132 |         GREEN,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 133 |         RGB(u32, u32, u32),
[INFO] [stdout] 134 |         HSV(u32, u32, u32),
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 135 |         HSL(u32, u32, u32),
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 136 |         CMY(u32, u32, u32),
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 137 |         CMYK(u32, u32, u32, u32),
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]   --> src/ch6/conversion.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout]  9 |     struct Number {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 10 |         value: i32
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Number` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]  --> src/ch7/expressions.rs:9:19
[INFO] [stdout]   |
[INFO] [stdout] 9 |         let z = { 2 * x; };
[INFO] [stdout]   |                   ^^^^^ the arithmetic operation produces a value
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 9 |         let z = { let _ = 2 * x; };
[INFO] [stdout]   |                   +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple variants are never constructed
[INFO] [stdout]    --> src/ch8/flow_control.rs:130:9
[INFO] [stdout]     |
[INFO] [stdout] 129 |     enum Color {
[INFO] [stdout]     |          ----- variants in this enum
[INFO] [stdout] 130 |         RED,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 131 |         BLUE,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 132 |         GREEN,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 133 |         RGB(u32, u32, u32),
[INFO] [stdout] 134 |         HSV(u32, u32, u32),
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 135 |         HSL(u32, u32, u32),
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 136 |         CMY(u32, u32, u32),
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 137 |         CMYK(u32, u32, u32, u32),
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]  --> src/ch7/expressions.rs:9:19
[INFO] [stdout]   |
[INFO] [stdout] 9 |         let z = { 2 * x; };
[INFO] [stdout]   |                   ^^^^^ the arithmetic operation produces a value
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 9 |         let z = { let _ = 2 * x; };
[INFO] [stdout]   |                   +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.34s
[INFO] running `Command { std: "docker" "inspect" "e26e16d68311cdd2b848cbc51d3a1755225b75590cda0c3838691a25cff1d511", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e26e16d68311cdd2b848cbc51d3a1755225b75590cda0c3838691a25cff1d511", kill_on_drop: false }`
[INFO] [stdout] e26e16d68311cdd2b848cbc51d3a1755225b75590cda0c3838691a25cff1d511
